JPS6283364A - dielectric porcelain composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention is suitable as a dielectric resonator material.

BaO-Ti02-Ba0-Ti02-Nd203-,
(, WO3, YO3%) system dielectric ceramic composition.

The dielectric ceramic composition of the present invention can be used not only as a dielectric resonator material but also as a dielectric substrate for microwave ICs, for example.

It can also be used for dielectric adjustment rods, etc.

[Prior art and its problems]

In recent years, with the increasing integration of microwave circuits, there has been a demand for small, high-performance dielectric resonators.

The dielectric ceramic composition used in such a dielectric resonator has a large dielectric constant ε1.

Characteristics such as excellent stability of the temperature coefficient τf of the resonant frequency, excellent linearity of the temperature characteristic of the resonant frequency, and a large no-load Q are required. As such dielectric ceramic compositions, those mainly composed of TiO2, BaO-TiO2, etc. are known, but they have large temperature coefficients and large dielectric loss in the microwave band, so they are not practical. There are some aspects that are difficult to achieve.

In addition, proposals for dielectric ceramic compositions based on B a O-T i O2-Na203 CBor, Dt, Ke
ram, Ges, 55 (1978) Nr, 7; JP-A No. 60-35406, etc.), but Comparative Examples 1-
As is clear from No. 4, Q is small and there is still room for improvement regarding the dielectric constant.

Recently, Ba (My3A-Taq) 03 and Ba
(ZnH・Taq)o3゜Ba(ZnH・Nl)%)0
Dielectric ceramic compositions having a perovskite structure such as the 3-based dielectric ceramic composition have been proposed, but the dielectric constant is small (ε, = 25
~40 degrees) for.

For example, when a resonator is used in the 0.1 to 4 GH2 band, there is a drawback that the resonator cannot be sufficiently miniaturized.

The object of the present invention is to provide dielectric resonator materials, in particular 0.1-4
An object of the present invention is to provide a dielectric ceramic composition suitable as a dielectric resonator material used in the GHz band.

Furthermore, the object of the present invention is to have a high dielectric constant and a large Q.

The object of the present invention is to provide a dielectric ceramic composition having good stability of τf and good linearity of temperature characteristics.

[Means and effects for solving the problems] The present invention has 9
Composition formula % Formula % (In the formula, Me represents one or more selected from the group consisting of VOs, WO3, and WO3 *x+y+z
is 1 mole or 0.1 to 0.2 mole, y is 0.
5 to 0.8 mol, 2 is 0.1 to 0.2 mol, t is x+
0.0003 to 0.3 mol, preferably o, o o s to 0.02 mol per y+z = 1 mol. ), neodymium, titanium, barium, and oxygen.

The present invention provides specific amounts of Bad, TiO2 and Nd2
With o3 as the main component, t vo, , vo3 and YOH
This is based on the knowledge that the drawbacks of conventional dielectric ceramic compositions can be improved by containing a specific amount of one or more of the following.

In the present invention, ■oSA, W03 and Y03A
In common, they have the effect of greatly improving the no-load Q, and also have a large dielectric constant. In addition to these effects,
In the case of VO3, a dielectric ceramic composition can be manufactured at a low firing temperature, and in the case of YOV2, there is an effect that the temperature coefficient τf of the co-photography frequency can be made small.

If the content of VOs, WO3, and YOh increases excessively, especially when Q is small, the relative permittivity also becomes small, so these contents are
+ y + z = 0.0003 to 0 per mole
．． 03 mol, preferably o, o o o s ~ 0.02
It is best to keep it within the molar range.

The dielectric ceramic composition according to the present invention is made of barium.

Titanium, neodymium, vanadium, tungsten.

It can be manufactured by mixing starting materials such as carbonates such as yttrium, oxides, sulfates, etc., calcining the mixture, then shaping, firing, and sintering.

For example, barium carbonate, titanium oxide, neodymium and vanadium oxide, tungsten oxide.

A predetermined amount of yttrium oxide or the like is wet-mixed with a solvent such as water or alcohol. Subsequently, after removing water, alcohol, etc., the product is crushed and calcined at 900 to 1100° C. for about 5 hours in an oxygen-containing gas atmosphere (for example, air atmosphere). After pulverizing the calcined material thus formed, it is mixed with an organic binder such as polyvinyl alcohol to make it homogeneous, dried, pulverized, and pressure-molded (pressure 100-100
00Kg/ff1). Then, by firing this molded product at 1300 to 1450''C in an oxygen-containing gas atmosphere such as air, the above dielectric ceramic composition can be obtained.

The dielectric ceramic composition thus obtained can be used as is or by processing it into an appropriate shape and size as necessary.
It can be used as a material for dielectric resonators, dielectric substrates for microwave ICs, dielectric adjustment rods, etc.
Excellent effects can be achieved when used as a dielectric resonator used in the 4 GHz band.

[Example 1] 0.15 mol of barium carbonate (BaO03) powder, 0.70 mol of titanium oxide powder (TiO2), 0.15 mol of neodymium oxide powder (Nd203) and 0.0005 mol of vanadium oxide powder (VOSA) were added to ethanol. The mixture was placed in a ball mill and wet mixed for 10 hours. This mixture was taken out from the ball mill, the solvent ethanol was evaporated, and the mixture was ground in a crusher for 1 hour. The crushed material is
After calcination at 950'C under air atmosphere.

The mixture was crushed again using a crusher for 1 hour. This pulverized material was mixed uniformly with an appropriate amount of polyvinyl alcohol solution, formed into a pellet with a diameter of 15 mm and a thickness of 5.5 mm, and was fired and sintered at 1360°C for 2 hours in an air atmosphere. Example dielectric ceramic composition (0.15BaO=0.70Ti
02 ・0.15Nd203' 0.0O05VO5
A) was obtained.

The thus obtained porcelain composition was cut into a size of 9 ml in diameter and 31 in thickness, and then measured by the dielectric resonance method to find the resonance frequency f. The no-load Q and relative dielectric constant ε1 at (2 to 6 GH2) were determined. Also.

The temperature dependence of the resonance frequency was measured in the range of -40 to 50°C, and the temperature coefficient τf was determined. The results are shown in Table 1.

Examples 2 to 5 Dielectric ceramic compositions were produced in the same manner as in Example 1, except that the amount of vanadium oxide powder used in Example 1 was changed, and the properties were measured in the same manner as in Example 1.

The results are shown in Table 1.

Comparative Examples 1 to 2 The vanadium oxide powder of Example 1 was not used (Comparative Example 1), and the amount of vanadium oxide powder used was o, o o
A dielectric ceramic composition was produced in the same manner as in Example 1, except that o s mol was changed to 0.04 mol (Comparative Example 2), and the characteristics were measured in the same manner as in Example 1.

The results are shown in Table 1.

1st table 0.15Ba0 ・0.70Ti02 ・0.15N
vOI for d203, /2 amount Examples 6 to 9 and Comparative Examples 3 to 5 Example 1 except that the amount of starting material used was changed.

The dielectric ceramic compositions listed in Table 2 were produced in the same manner as in Example 1, and their properties were measured in the same manner as in Example 1.

The results are shown in Table 2.

Table 2 Examples 10 to 14 The dielectric ceramic compositions listed in Table 6 were produced in the same manner as in Example 1 except that the vanadium oxide powder in Example 1 was replaced with tungsten oxide powder and the firing temperature was changed.

Characteristics were measured in the same manner as in Example 1.

The results are shown in Table 6.

Table 3 * 0.15BaO' 0.70Ti02-0.15N
Amount of WO3 relative to d203 Examples 15 to 19 The vanadium oxide powder in Example 1 was replaced with yttrium oxide powder, and the dielectric ceramic compositions listed in Table 4 were produced in the same manner as in Example 1. Characteristics were measured.

The results are shown in Table 4.

1\To the 4th table! 10.15BaO・0.70Ti 02・0.15
Amount of Y○3/2 relative to Nd203 [Effect of the invention] The BaO/TiO2/Nd2O3-based dielectric ceramic composition containing vo5/21 wo31 YoF'2 or the like of the present invention has a particularly large no-load Q. Further, the dielectric constant ε1 is large, and the stability of the temperature coefficient τf of the resonance frequency is good.

Therefore, the dielectric ceramic composition of the present invention is suitable as a dielectric resonator material, and in particular, when used as a resonator material used in the 0.1-4 GHz band, a compact and high-performance resonator can be obtained.

Claims (1)

[Claims] Compositional formula xBaO・yTiO_2・zNd_2O_3・tMe(
In the formula, Me is VO_5_/_2, WO_3 and YO_
Indicates one or more types selected from the group consisting of 3_/_2,
When x + y + z is 1 mol, x is 0.1 to 0.2 mol, y is 0.5 to 0.8 mol, z is 0.1 to 0.2 mol, and t is x + y + z = 1 mol. 0.0003~0.
03 mole. ) A dielectric ceramic composition comprising one or more elements selected from the group consisting of vanadium, tungsten and yttrium, neodymium, titanium, barium and oxygen.