CN215757727U - Pulling preparation device for controlling volatilization of gallium-containing optical functional crystal - Google Patents
Pulling preparation device for controlling volatilization of gallium-containing optical functional crystal Download PDFInfo
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- CN215757727U CN215757727U CN202120531273.4U CN202120531273U CN215757727U CN 215757727 U CN215757727 U CN 215757727U CN 202120531273 U CN202120531273 U CN 202120531273U CN 215757727 U CN215757727 U CN 215757727U
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- 239000013078 crystal Substances 0.000 title claims abstract description 230
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 229910052733 gallium Inorganic materials 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 230000003287 optical effect Effects 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 84
- 238000002844 melting Methods 0.000 claims abstract description 22
- 230000008018 melting Effects 0.000 claims abstract description 22
- 229910001195 gallium oxide Inorganic materials 0.000 claims description 22
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 3
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- 239000007788 liquid Substances 0.000 description 18
- ZPDRQAVGXHVGTB-UHFFFAOYSA-N gallium;gadolinium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Gd+3] ZPDRQAVGXHVGTB-UHFFFAOYSA-N 0.000 description 9
- QZQVBEXLDFYHSR-UHFFFAOYSA-N gallium(III) oxide Inorganic materials O=[Ga]O[Ga]=O QZQVBEXLDFYHSR-UHFFFAOYSA-N 0.000 description 8
- 229910052741 iridium Inorganic materials 0.000 description 8
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000004321 preservation Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002223 garnet Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 229910005224 Ga2O Inorganic materials 0.000 description 2
- 229910052771 Terbium Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
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- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 1
- 150000002258 gallium Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- MTRJKZUDDJZTLA-UHFFFAOYSA-N iron yttrium Chemical compound [Fe].[Y] MTRJKZUDDJZTLA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a pulling preparation device for controlling volatilization of gallium-containing optical functional crystals, which comprises a crucible, gallium-containing crystals arranged in the crucible, a heating mechanism for heating the gallium-containing crystals and a pulling mechanism for carrying out auxiliary growth on the gallium-containing crystals, wherein the pulling end of the pulling mechanism extends into the crucible and is abutted against the gallium-containing crystals arranged in the crucible, the heating mechanism comprises at least two sections of heating units, and each section of heating unit is respectively wound on the periphery of the crucible; the pulling preparation device adopts the multi-section induction coil heating mode to realize that the melt containing gallium crystals is gradually melted from the crucible opening to the crucible bottom along with the growth of the crystals, thereby avoiding the problems of serious volatilization and uncontrollable components of the crystal melt caused by the complete period melting of all the gallium crystals in the crucible.
Description
Technical Field
The utility model relates to the technical field of optical functional crystal preparation, in particular to a pulling preparation device for controlling volatilization of gallium-containing optical functional crystals.
Background
The gallium-containing optical functional crystal, such as gadolinium gallium garnet crystal (GGG), is an excellent substrate crystal, the matching degree of the lattice constant and the thermal expansion coefficient of the gallium-containing optical functional crystal with an Yttrium Iron Garnet (YIG) magneto-optical film is high, and the quality of the GGG substrate directly determines the performance of an epitaxial film. Terbium Gallium Garnet (TGG) crystals are excellent magneto-optical crystals in the field of visible and near-infrared band lasers, and their properties will directly affect the power of the crystal to withstand the laser and the transmission performance of the laser.
Gallium oxide is one of the main components of gallium-containing crystal, and is easy to volatilize and decompose in the process of crystal growth, and Ga2O3＝Ga2O+O2×) decomposition of produced Ga2O and O2Reaction with the iridium crucible can result in the production of iridium and heterogeneous oxides, resulting in: the components of the melt deviate from the stoichiometric ratio, so that the high-quality stable growth of the crystal is influenced; the floating iridium influences the temperature gradient around the seed crystal, and is easy to cause the eccentric growth of the crystal; the heterogeneous oxides are easily transported to a solid-liquid interface by melt convection and are wrapped to form particles in crystals, so that crystal defects are generated.
Although at present, Ga is controlled to a certain extent by optimizing the component ratio of the initial raw materials (a certain proportion of excessive gallium oxide), changing the crystal growth atmosphere (increasing the oxygen partial pressure), synthesizing high-purity polycrystalline raw materials in advance and the like2O3And (4) volatilizing. However, the component proportion range of the gallium-containing crystal for stable growth is narrow, and excessive gallium oxide can be mixed with another gallium oxide in the crystalSeed phase is separated out, so that the scattering of crystals is formed, and the crystallization quality of the crystals is seriously influenced; the increase in the oxygen partial pressure inhibits the decomposition of gallium oxide to some extent, but also causes oxidation of the iridium crucible, thereby affecting the growth of the crystal. And as the crystal size increases, the crystal growth period is prolonged, and the method is difficult to control the volatilization of gallium oxide in the later stage of crystal growth. Particularly, with the rapid development of high-power solid laser and fiber laser technologies, the problem of volatilization of gallium oxide is prominent in the urgent need of large-size gallium-containing crystals, so that effective control of the volatilization of gallium oxide is a technical difficulty to be overcome.
SUMMERY OF THE UTILITY MODEL
Based on the technical problems in the background art, the utility model provides a pulling preparation device for controlling the volatilization of gallium-containing optical functional crystals, which can effectively control the volatilization of gallium oxide and improve the quality of grown crystals.
The utility model provides a pulling preparation device for controlling volatilization of gallium-containing optical function crystals, which comprises a crucible, gallium-containing crystals arranged in the crucible, a heating mechanism for heating the gallium-containing crystals and a pulling mechanism for carrying out auxiliary growth on the gallium-containing crystals, wherein the pulling end of the pulling mechanism extends into the crucible and is abutted against the gallium-containing crystals arranged in the crucible, the heating mechanism comprises at least two sections of heating units, and each section of heating unit is respectively wound on the periphery of the crucible.
Furthermore, different heating units are sequentially attached to the periphery of the crucible and wound, the opening of the crucible is flush with the uppermost end of one heating unit, and the heating temperature of the heating unit at the opening of the crucible is equal to the melting point of the crystal;
the power of the heating unit is gradually increased from the bottom of the crucible to the opening of the crucible, and the concentration of gallium oxide in the gallium-containing crystal is reduced in a unidirectional gradient manner.
Further, the heating units comprise coils, and the distance between adjacent winding coils in the same heating unit is equal to the distance between adjacent coils in different heating units;
the number of turns of the coil in each heating unit is the same, the diameter of the coil is the same, and each heating unit is powered by different power supply units respectively.
Furthermore, the pulling mechanism comprises a seed crystal and a seed crystal rod, one end of the seed crystal rod is inserted into the crucible and fixed with the seed crystal, and one end of the seed crystal, far away from the seed crystal rod, is abutted against the upper end face of the gallium-containing crystal.
Furthermore, the periphery of the crucible is also provided with a heat preservation layer, and the heating units are sequentially attached to the heat preservation layer.
The pulling preparation device for controlling the volatilization of the gallium-containing optical functional crystal has the advantages that: the pulling preparation device for controlling the volatilization of the gallium-containing optical functional crystal provided by the structure of the utility model adopts the way of heating by the multi-section induction coil to realize that the melt of the gallium-containing crystal is gradually melted from the crucible opening to the crucible bottom along with the growth of the crystal, thereby avoiding the problems of serious volatilization and uncontrollable components of the crystal melt caused by the complete period melting of all gallium-containing crystals in the crucible; meanwhile, different heating temperatures can be provided for the gallium-containing crystals at different positions in the crucible by setting different heating powers, so that the melting state of the gallium-containing crystals can be controlled, and when the gallium-containing crystals are subjected to crystal growth, the real-time movement of the solid-liquid interface can be realized by feeding back the induction heating power of the coil according to the descending displacement of the solid-liquid interface of the polycrystalline raw material prepared from the gallium-containing crystals and the crystal growth speed, and the volatilization defect of the gallium-containing crystals during crystal growth is avoided.
Drawings
FIG. 1 is a schematic structural view of a pulling preparation apparatus corresponding to an embodiment of growing GGG crystals in the present invention;
FIG. 2 is a schematic view showing a structure of a pulling preparation apparatus corresponding to an embodiment of growing TGG crystal in the present invention;
the device comprises a crucible, a gallium-containing crystal, a heating mechanism, a lifting mechanism, a heat-insulating layer, a coil, a seed crystal rod, a first coil, a second coil, a third coil, a fourth coil, a fifth coil, a sixth coil and a seventh coil, wherein the crucible is 1, the gallium-containing crystal is 2, the heating mechanism is 3, the lifting mechanism is 4, the heat-insulating layer is 5, the coil is 31, the seed crystal is 41, the seed crystal rod is 42, the first coil is 311, the second coil is 312, the third coil is 313, the fourth coil is 314, the fifth coil is 315, the sixth coil is 316, and the seventh coil is 317.
Detailed Description
The present invention is described in detail below with reference to specific embodiments, and in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in figure 1, the pulling preparation device for controlling volatilization of gallium-containing optical function crystals comprises a crucible 1, gallium-containing crystals 2 arranged in the crucible 1, a heating mechanism 3 for heating the gallium-containing crystals 2 and a pulling mechanism 4 for carrying out auxiliary growth on the gallium-containing crystals 2, wherein the pulling end of the pulling mechanism 4 extends into the crucible 1 and is abutted against the gallium-containing crystals 2 arranged in the crucible 1, the heating mechanism 3 comprises at least two sections of heating units, and each section of heating unit is respectively wound on the periphery of the crucible 1.
Because the gallium oxide in the gallium-containing crystal 2 is volatile in the process of crystal growth, and crystal defects are generated, the method adopts a mode that the power of a heating unit is gradually increased from the bottom of a crucible to a crucible opening, and the melt of the gallium-containing crystal 2 is gradually melted from the crucible opening to the bottom of the crucible along with the growth of the crystal by adopting the multi-section induction heating mode, so that the problems that the components of the crystal melt are seriously volatilized and uncontrollable due to the complete-period melting of all the gallium-containing crystals 2 in the crucible 1 are avoided.
The gallium oxide concentration in the gallium-containing crystal 2 can be increased in a unidirectional gradient manner from the crucible opening to the crucible bottom, the gallium-containing crystal 2 adopting unidirectional variation of the concentration gradient can compensate the volatilization of components, and the requirements of the high-power laser technology and the optical communication field on large-size and high-quality gallium-containing optical functional crystals can be met.
In the present application, the gallium-containing crystal 2 may be Ga2O3、Gd3Ga5O12、 Tb3Ga5O12、Y3Sc2Ga3O12、Gd3Sc2Ga3O12、Y3Ga5O12、Gd3xY3(1-x) Sc2Ga3O12(0<x<1) One of the host crystals or Yb3 +、Nd3+、Er3+、Tm3+、Ho3+、 Pr3+、Eu3+、Sm3+、Dy3+、Ti3+、Cr3+And activating the laser crystal formed after the ion doping.
In this embodiment, different heating units are sequentially attached to the periphery of the crucible 1 and wound, the opening of the crucible is flush with the uppermost end of one of the heating units, and the heating temperature of the heating unit at the opening of the crucible is equal to the melting point of the crystal. The method specifically comprises the following steps: the heating unit comprises a coil 31, the different coils work independently, different heating temperatures can be provided for the gallium-containing crystals 2 at different positions in the crucible 1 by setting different heating powers, the melting state of the gallium-containing crystals 2 can be controlled, when the gallium-containing crystals 2 are subjected to crystal growth, the solid-liquid interface can be moved in real time according to the descending displacement and the crystal growth speed of the polycrystalline raw material solid-liquid interface prepared from the gallium-containing crystals 2 and the induction heating power of the feedback coil, and the volatilization defect of the gallium-containing crystals 2 during crystal growth is avoided.
Specifically, the number of turns of the coil 31 in each heating unit is the same, and the diameter of the coil is the same, and each heating unit is powered by a different power supply unit. Different coils are set to be consistent in specification, so that the heating power of different coils can be synchronously adjusted when the solid-liquid interface of the polycrystalline raw material descends and displaces. Meanwhile, the distance between the adjacent winding coils 31 in the same heating unit is equal to the distance between the adjacent coils 31 in different heating units, so that the defect that the gallium-containing crystal 2 is heated due to faults is avoided, and the gallium-containing crystal 2 can be stably pulled and grown after being sequentially melted from the bottom of the crucible to the opening of the crucible.
It should be noted that, assuming that the total number of coil sections is N, the time taken for the melt height of the gallium-containing crystal 2 in the crucible 1 to decrease by 1/N is T hours as the crystal grows, and the power of the N-th coil is increased to the power required by the melting point temperature of the gallium-containing crystal 2 at a constant speed in NT time(ii) a In each T time, aiming at the power adjustment of a single coil, the weight of the crucible 1 and the gallium-containing crystal 2 in the crucible can be detected in real time, and the adjustment can be carried out according to the relationship between the increment of the crystal weight in unit time and the theoretical weight increment. Assuming that the grown crystal is cylindrical, the crystal growth rate is v, the crystal density is rho, and the theoretical weight increase is Deltam within the DeltaT times＝πr2And x ν x Δ T × ρ, when the actual weight increase is larger than the theoretical weight increase, increasing the power, and otherwise, decreasing the power.
In the present embodiment, the pulling mechanism 4 includes a seed crystal 41 and a seed rod 42, one end of the seed rod 42 is inserted into the crucible 1 and fixed to the seed crystal 41, and one end of the seed crystal 41 remote from the seed rod 42 abuts against the upper end surface of the gallium-containing crystal 2. The shape of the seed crystal 41 can be a cylinder or a cuboid and the like, the gallium-containing crystal 2 is pulled and grown by adopting the seed crystal 41, the melt is directionally grown along the crystal orientation of the seed crystal, meanwhile, the impurities and the defects in the high-quality seed crystal are few, the defects in the grown crystal can be reduced, and the crystal quality is improved.
In this example, 1 periphery of crucible still is provided with heat preservation 5, and the attached heat preservation 5 setting in proper order of coil 31, the gallium oxide concentration that contains among the gallium class crystal 2 is one-way gradient and increases, and the heat preservation 5 outside sets up the temperature field structure, and the temperature field structure can adopt insulating brick or the heat preservation section of thick bamboo of zirconia or alumina preparation, combines the crystal length of growing to carry out the buildding of cylindric temperature field or rectangle tube-shape temperature field, and crucible 1, heat preservation 5 etc. all are in this temperature field of buildding.
In this embodiment, the method for preparing a gallium-containing optical functional crystal by pulling while controlling volatilization includes the steps of:
(A) according to the size of the gallium-containing crystal 2, the size of the crucible 1 is determined, at least two sections of independent heating units are wound on the periphery of the crucible 1, and different heating units are sequentially wound from the crucible bottom to the crucible opening.
As for the pulling preparation apparatus for crystal growth, the above description of the pulling preparation apparatus for controlling volatilization of the gallium-containing optically functional crystal is referred to.
(B) Respectively preparing a plurality of polycrystalline raw materials containing gallium oxides with different proportions according to the types of the gallium-containing crystals 2, wherein the polycrystalline raw materials and the heating units are arranged in corresponding quantity;
the shape of the polycrystalline raw material is the same as that of the crucible 1, and the polycrystalline raw material is cylindrical or rectangular.
(C) The polycrystalline raw materials are sequentially placed in a crucible 1, and the proportion of gallium oxide from the opening of the crucible to the bottom of the crucible is increased in a single direction;
the crucible 1, the coils 31, the heat preservation layer 5, the seed crystals 41 and the seed crystal rods 42 are concentrically and coaxially placed, wherein the number of prepared polycrystalline raw materials is multiple, the gallium oxide proportion varies unidirectionally within a range of 0-10%, the polycrystalline raw materials containing different gallium oxides are sequentially placed in the crucible 1 in a mode of unidirectionally increasing the gallium oxide proportion, in order to better control the crystal growth volatilization of the polycrystalline raw materials, the number of the polycrystalline raw materials and the number of the coils 31 can be set to be consistent, and the outer side of each polycrystalline raw material respectively corresponds to one coil 31 to be heated so as to realize the solid state and molten state control of different polycrystalline raw materials.
(D) The polycrystalline raw material in the crucible 1 is heated by the heating unit in a segmented manner, and the polycrystalline raw material in the crucible 1 is pulled and grown by the pulling mechanism 4.
In this embodiment, for (D), the following steps are specifically included:
(D1) vacuumizing the crucible 1, filling protective gas Ar or N and less than 5% volume of oxygen when the pressure in the furnace is less than 10Pa, and filling the protective gas to (1.0-1.8) multiplied by 105Pa；
The protective gas Ar or N is used for protecting the crucible 1 from being oxidized, and oxygen which is filled in the furnace with the volume less than 5 percent can inhibit the decomposition of gallium oxide to a certain degree and can not cause the oxidation of the crucible 1, thereby avoiding the influence of the oxidation of the crucible 1 on the growth of crystals.
(D2) The coils 31 in different heating units are respectively heated by multi-section induction, the heating power of the coils 31 is gradually increased from the bottom of the crucible to the opening of the crucible, the heating temperature of the heating unit at the opening of the crucible is equal to the melting point of crystals, and the polycrystalline raw materials at the opening of the crucible are melted;
the power of the coil 31 at the opening of the crucible can be 500-1000W higher than that of the coil 31 at the bottom of the crucible, and the power difference is set so that the raw material at the lower part of the crucible 1 is in a proper temperature interval of melting but not melting. The heating is carried out through the coil 31, so that the polycrystalline raw material at the position of the crucible opening is in a melting state, the polycrystalline raw material at the lower part is in a melting state (namely, in a non-melting state), and when the polycrystalline raw material in the melting state is subjected to crystal growth, the polycrystalline raw material at the lower part cannot volatilize due to melting in advance, and the effect of controlling the volatilization of crystals is achieved.
(D3) Slowly descending the seed crystal 41 to the end face of the molten polycrystalline raw material, and adjusting the heating power of the coil 31 until the stable contact time of the seed crystal 41 and the end face of the molten polycrystalline raw material is more than 0.2 h;
since the weight of the seed crystal 41 is generally changed, increased or decreased when it is just brought into contact with the molten polycrystalline raw material, the power is adjusted so that the weight of the seed crystal 41 in the molten polycrystalline raw material is neither increased nor decreased, and therefore the stable contact time of the seed crystal 41 with the end face of the molten polycrystalline raw material is set to be longer than 0.2 h.
(D4) Pulling and rotating the seed crystal 41 at a rate to perform crystal growth of the polycrystalline raw material;
the pulling preparation of crystal growth is realized by pulling and rotating the seed rod 42, wherein the pulling and rotating of the seed rod 42 can be manually completed or mechanically completed, and the specific pulling speed and rotation speed can be set according to the specific polycrystalline raw material.
(D5) According to the descending displacement of the solid-liquid interface of the polycrystalline raw material and the growth speed of the crystal, the induction heating power of the coil 31 is fed back, and the real-time movement of the solid-liquid interface is realized;
(D6) after the crystal growth is finished, the seed rod 42 is pulled at a certain speed to separate the crystal from the liquid level in the crucible 1, and the crystal is taken out after being cooled to room temperature.
Through the steps (A) to (D), the problem of component volatilization in the growth process of the existing gallium-containing crystal 2 can be effectively inhibited, the crystal growth stability is improved, a new technical scheme is provided for the growth of large-size gallium-containing crystals, so that the growth of high-quality crystals is realized, and the foundation of large-size high-quality gallium-containing crystal materials is laid for the development of the laser technical field and the optical communication field.
As an example, GGG (gadolinium gallium garnet) crystals are grown by adopting a three-section induction heating coil induction heating mode, and the size of the crystals is
As shown in FIG. 1, a cylindrical crucible 1 was made of iridium metal, and the size of the crucible 1 was 60mm in inner diameter and 45mm in inner height.
Growing GGG crystals:
(11) preparing raw materials: with high purity Gd2O3And Ga2O3The nano powder is GGG crystal growth raw material and Gd according to the molar ratio2O3:Ga2O3＝3:5，Ga2O3Weighing raw materials with the ratio of 0.5%, 1% and 1.5% excess respectively, mixing the raw materials by a high-frequency oscillation mixer for 24 hours, pressing the mixture into three blocks of raw materials with the diameter of 60mm multiplied by 20mm, wherein the block of raw materials is 0.5%, 1% and 1.5%, respectively, calcining the blocks of raw materials at 1200 ℃ for 24 hours to obtain a polycrystalline raw material which is used as a growth raw material of GGG crystals.
(12) Seed crystal production: selecting a high-quality seed crystal 41 blank body with the <111> crystal orientation, wherein the section of the seed crystal 41 is circular, the diameter is about 6mm, one end of the seed crystal 41 is fixedly connected with a seed crystal rod 42, and the other end of the seed crystal is abutted against polycrystalline raw materials in the crucible 1.
(13) Charging: a temperature field structure for growing crystals is constructed in a furnace of the intermediate frequency pulling single crystal, a crucible 1, an insulating layer 5, a coil 31, a seed rod 42 and a seed crystal 41 are concentrically and coaxially arranged, a polycrystalline raw material is filled into an iridium crucible 1, and the proportion of gallium oxide is increased in a single direction from a crucible opening to the bottom of the crucible (0.5% → 1.0% → 1.5%).
(14) Growing a crystal: vacuumizing, and filling protective gas N when the air pressure in the hearth is less than 10Pa2And 2% of the furnace volume of O2The pressure charged into the furnace is (1.0-1.8) x 105Pa, the air pressure in the hearth is slightly positive pressure, air is prevented from entering the hearth oxidation crucible 1, and three sections are adoptedInduction heating is carried out by an induction heating coil 31, the number of turns of three coils 31 is the same, the distance between the coils 31 and 31 is the same as the distance between each turn of the coils 31, the total height of the coils 31 is the same as the height of the crucible 1, the power of a power supply is increased, the load power of a first coil 311 is higher than 500W of the load power of a second coil 312 and a third coil 313, the power of the three coils is synchronously increased through observation of an observation window to melt polycrystalline raw materials at the crucible opening, the raw materials at other parts are in a molten (non-molten) state, the seed crystal 41 is slowly lowered to be contacted with the end face of the molten polycrystalline raw material, the heating power of the first coil 311 is adjusted until the stable time of the contact face of the seed crystal 41 and the molten polycrystalline raw material is longer than 0.2h, the weight signal of an electronic scale of the single crystal furnace is basically unchanged, then the seed crystal is pulled at the speed of 0.5-1.5 mm/h and rotated at the speed of 5-10 rpm/min to carry out crystal growth, by adopting the speed of 0.5-1.5 mm/h for pulling and the rotating speed of 5-10 rpm/min, the problems of long period, serious volatilization, power consumption and the like caused by too slow growth can be avoided; the crystal pulled out due to the fast growth is probably polycrystalline and cannot be used, and the quality of the crystal is influenced.
From the beginning of automatic crystal growth to the 1/3 process that the liquid level drops the height of the crucible 1, the power of the second coil 312 is uniformly increased to the power required by the melting of the polycrystalline raw material; from the start of automatic crystal growth to 2/3 when the liquid level drops to the height of the crucible 1, the power of the third coil 313 is uniformly increased to the power for melting the raw materials, thereby realizing the real-time movement of a solid-liquid interface; when the actual growth length of the crystal reaches 80mm, the crystal grows completely, then the crystal is separated from the liquid level at the speed of 10-50 mm/h, pulling-off is finished by observing a signal of an electronic scale and keeping unchanged, then the temperature is reduced at 40-50 ℃/h, the crystal is taken out after being cooled to room temperature, and the speed setting of 10-50 mm/h is adopted, so that the phenomenon that the pulling-off speed is too high and the crystal is cracked possibly caused by large temperature difference is avoided; if the pulling-off is too slow, the pulling-off takes too long.
As an example, a four-stage induction heating coil is used to grow TGG (terbium gallium garnet) crystal with the size of the crystal
As shown in FIG. 2, a cylindrical crucible 1 was made of iridium metal, and its inner diameter was 90mm and its inner height was 90 mm.
And (3) growing TGG crystals:
(21) preparing raw materials: with high purity Tb4O7And Ga2O3The nanometer powder is TGG crystal growth raw material with molar ratio Tb4O7:Ga2O3＝3:10，Ga2O3Weighing raw materials in proportions of 0.5%, 1%, 1.5% and 2.0% excess respectively, mixing for 24h by adopting a high-frequency oscillation mixer, pressing into four blocks of raw materials with the diameter of 90mm, wherein the four blocks of raw materials are respectively 0.5%, 1%, 1.5% and 2.0%, and calcining for 24h at 1250 ℃ to obtain a polycrystalline raw material which is used as a growth raw material of TGG crystals.
Mixing for 24 hours by adopting a high-frequency oscillation mixer, mainly aiming at improving the mixing uniformity; the arrangement of calcining at 1250 ℃ for 24 hours mainly leads the blocky raw materials to be calcined into polycrystalline raw materials with the same phase as crystals, and is beneficial to reducing the volatilization of components.
(22) Seed crystal production: selecting a high-quality seed crystal 41 blank body with the <111> crystal orientation, wherein the section of the seed crystal 41 is circular, the diameter is about 8mm, one end of the seed crystal 41 is fixedly connected with a seed crystal rod 42, and the other end of the seed crystal is abutted against polycrystalline raw materials in the crucible 1.
(23) Charging: a temperature field structure for growing crystals is constructed in a furnace of the intermediate-frequency pulling single crystal, a crucible 1, an insulating layer 5, a coil 31, a seed rod 42 and a seed crystal 41 are concentrically and coaxially arranged, a polycrystalline raw material is filled into an iridium crucible 1, and the proportion of gallium oxide is increased in a single direction from a crucible opening to a crucible bottom (0.5% → 1.0% → 1.5% → 2.0%).
(24) Growing a crystal: vacuumizing, and filling protective gas N when the air pressure in the hearth is less than 10Pa2And 2% of the furnace volume of O2The pressure charged into the furnace is (1.0-1.8) x 105Pa, heating by adopting four sections of induction heating coils, wherein the turns of the four sections of coils are the same, the distance between the coils is the same as the distance between each turn of coil, the total height of the coils is the same as the height of the crucible, the power supply power is increased, and the load power of the fourth coil 314 is higher than the loads of the fifth coil 315, the sixth coil 316 and the seventh coil 317The power can be set to be 800W higher, and the power of the fourth coil is mainly higher than the power of other coils by a certain temperature; the power of other three coils can be the same, and a certain power difference can also be generated, and if the power is the same, the complexity of adjustment can be reduced. Observing through an observation window, synchronously raising the power of four coils to melt the raw material at the opening of the crucible, keeping the raw material at other parts in a molten (non-molten) state, slowly lowering the seed crystal 41 until the end surface of the molten polycrystalline raw material is contacted, adjusting the heating power of the fourth coil 314 until the stable time of the contact surface of the seed crystal 41 and the molten polycrystalline raw material is more than 0.2h, keeping the weight signal of an electronic scale of the single crystal furnace basically unchanged, then pulling at the speed of 0.5-1.5 mm/h and rotating the seed crystal at 5-10 rpm/min for crystal growth, and adopting the speed of 0.5-1.5 mm/h and the rotating speed of 5-10 rpm/min, so that the problems of long period, serious volatilization, power consumption and the like caused by too slow growth can be avoided; the crystal pulled out due to the fast growth is probably polycrystalline and cannot be used, and the quality of the crystal is influenced.
From the beginning of automatic crystal growth to 1/4 when the liquid level drops to the height of the crucible, the power of the fifth coil 315 is uniformly increased to the power required by melting of the crystal raw material; from the beginning of automatic crystal growth to 2/4 when the liquid level drops to the crucible height, the power of the sixth coil 316 is uniformly increased to the power required by melting of the polycrystalline raw materials; from the beginning of automatic crystal growth to the time that the liquid level drops by the height 3/4 of the crucible, the power of the seventh coil 317 is uniformly increased to the power required by the melting of the polycrystalline raw material, so that the real-time movement of a solid-liquid interface is realized; and when the actual growth length of the crystal reaches 100mm, finishing growth, separating the crystal from the liquid level at the speed of 10-50 mm/h, observing a weight signal of the electronic scale to keep unchanged, indicating that the pulling-off is finished, cooling at 40-50 ℃/h, cooling to room temperature, and taking out the crystal.
The speed is set at 10-50 mm/h, so that the phenomenon that the crystal is cracked due to large temperature difference caused by excessively high pulling-off speed is avoided; if the pulling-off is too slow, the pulling-off takes too long.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
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