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GB824072A - Improvements in or relating to ferro-magnetic ferrite materials - Google Patents

Improvements in or relating to ferro-magnetic ferrite materials

Info

Publication number
GB824072A
GB824072A GB32345/57A GB3234557A GB824072A GB 824072 A GB824072 A GB 824072A GB 32345/57 A GB32345/57 A GB 32345/57A GB 3234557 A GB3234557 A GB 3234557A GB 824072 A GB824072 A GB 824072A
Authority
GB
United Kingdom
Prior art keywords
oxides
sintering
oxygen
crystals
oct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB32345/57A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB824072A publication Critical patent/GB824072A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Magnetic Ceramics (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

824,072. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 16, 1957 [Oct. 19,1956], No. 32345/57. Class 38 (2). A ferromagnetic material consists of crystals or mixed crystals having a composition according to the formula Ba (4-a-b-c) Sr a Pb b Ca c Me<SP>II</SP> (2-d-e-f) Co<SP>II</SP> d Cu<SP>II</SP> e Mn<SP>II</SP> f Fe<SP>III</SP> (36-g) CO<SP>III</SP> g O 60 where Me<SP>II</SP> is one or more of the bivalent metals Fe, Ni, Zn, Mg and the coefficients have values from zero up to the following figures: a, 1.0; b, 0.7; c, 0.6; d, 2.0; e, 0.6; f, 0.6; g, 0.5. Part of the iron may be replaced by chromium or aluminium. The crystals have a rhombohedral structure the elementary cell of which has a c-axis of 113.1 Š and an a-axis of 5.9 Š in the hexagonal crystal system. The materials have a preferred plane (and high permeability) or preferred direction of magnetization (suitable for permanent magnets and microwave equipment) corresponding to negative and positive constants of crystal-anisotropy, in many cases depending on whether they are at a temperature above or below one which is determined mainly by the amount of bivalent cobalt. The material may be made by sintering together oxides or compounds which convert into oxides. The metal oxides may be partly or wholly replaced by reaction products of at least two of the oxides. The materials may be presintered one or more times at 1000‹ C., reground and sintered at between 1000‹ and 1450‹ C., preferably between 1200‹ and 1350‹ C. If no divalent Fe is to be left the material may be finally heated in oxygen between 1000‹ and 1250‹ C. The mixing may be in ethyl alcohol, silicates and fluorides may be added as sintering agents, and an organic binder may be added when shaping it before sintering. The manufacture of many compounds having formulae falling within the main formula is described and their magnetic properties are tabulated. Sintering in oxygen, nitrogen, and air, and slow cooling in air, and oxygen, are mentioned.
GB32345/57A 1956-10-19 1957-10-16 Improvements in or relating to ferro-magnetic ferrite materials Expired GB824072A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL211560 1956-10-19

Publications (1)

Publication Number Publication Date
GB824072A true GB824072A (en) 1959-11-25

Family

ID=19750803

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32345/57A Expired GB824072A (en) 1956-10-19 1957-10-16 Improvements in or relating to ferro-magnetic ferrite materials

Country Status (8)

Country Link
US (1) US3020235A (en)
BE (1) BE561767A (en)
CH (1) CH387820A (en)
DE (1) DE1174673B (en)
ES (1) ES238128A1 (en)
FR (1) FR1184419A (en)
GB (1) GB824072A (en)
NL (1) NL92523C (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE489797A (en) * 1948-06-25
US2640813A (en) * 1948-06-26 1953-06-02 Aladdin Ind Inc Reaction product of a mixed ferrite and lead titanate
LU30876A1 (en) * 1950-09-19
US2736708A (en) * 1951-06-08 1956-02-28 Henry L Crowley & Company Inc Magnetic compositions
US2778803A (en) * 1953-02-06 1957-01-22 Aerovox Corp Magnetically hard materials
DE1017521B (en) * 1953-11-27 1957-10-10 Steatit Magnesia Ag Process for the production of ferromagnetic, ceramic bodies with high quality at high frequency

Also Published As

Publication number Publication date
FR1184419A (en) 1959-07-21
US3020235A (en) 1962-02-06
DE1174673B (en) 1964-07-23
NL92523C (en) 1959-10-15
BE561767A (en) 1958-04-19
CH387820A (en) 1965-02-15
ES238128A1 (en) 1958-05-16

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