US3394082A - Cubic ferrite with a high upper frequency limit - Google Patents

Cubic ferrite with a high upper frequency limit Download PDF

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Publication number
US3394082A
US3394082A US406887A US40688764A US3394082A US 3394082 A US3394082 A US 3394082A US 406887 A US406887 A US 406887A US 40688764 A US40688764 A US 40688764A US 3394082 A US3394082 A US 3394082A
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Prior art keywords
frequency limit
upper frequency
high upper
cubic ferrite
ferrites
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Expired - Lifetime
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US406887A
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Hildebrandt Mieczyslaw
Nicolas Jean
Vassiliev Avenir
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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    • 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
    • C04B35/2616—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 lithium

Definitions

  • the ferrites according to the invention have a higher frequency limit than conventional ferrites.
  • the present invention relates to cubic lithium ferrites.
  • These materials are used in applications involving scalar permeability, for example for the fabrication of magnetic cores.
  • the ferrites accordnng to the invention have a composition defined by the formula:
  • x lies between 0 and 0.25 y lies between 0.15 and 0.6 2 lies between 0.04 and 0.35.
  • the raw materials used are the compounds Fe O A1 0 lMn0 CO Li and C00 with a degree of purity higher than 99.5%.
  • the compounds are proportioned by weight, crushed in distilled water for 24 hours in steel ball-mills and dried.
  • the resulting mixture is pre-sintered at 800 C. for 2 hours and crushed once more as above.
  • the powder is transformed to a granulate by adding by weight of aqueous polyvinyl alcohol solution.
  • the granulate is pressed at a pressure of 1 ton 3,394,082 Patented .luly 23, 1968 "ice per cm.
  • the resulting parts are sintered for 3 hours at a temperature T, between 1100 and 1200 C.
  • the sintering temperature is less than 1100 C., the resulting material is crumbly. If the temperature is above 1200" C., the material decomposes.

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

Description

United States Patent 3,394,082 CUBIC FERRITE WITH A HIGH UPPER FREQUENCY LIMIT Mieczyslaw Hildebrandt, Jean Nicolas, and Avnir Vassiliev, Paris, France, assignors t0 CSFCompagnie Generale de Telegraphic Sans Fl], a corporation of France No Drawing. Filed Oct. 27, 1964, Ser. No. 406,887 Claims priority, applicgastiogsyrance, Oct. 30, 1963,
1 Claim. (Cl. 252-6258) ABSTRACT OF THE DISCLOSURE The invention concerns cubic lithium ferrites used in application involving scalar permeability and defined by the formula Ml 1 X) F6203, 351 91120 ZCOO wherein:
x lies between 0 and 0.25 y lies between 0.15 and 0.6 z lies between 0.04 and 0.35
The ferrites according to the invention have a higher frequency limit than conventional ferrites.
The present invention, relates to cubic lithium ferrites.
These materials are used in applications involving scalar permeability, for example for the fabrication of magnetic cores.
Known materials of this kind have an upper frequency h, of the order of a few tens of mc./s., at which relaxation phenomena cause a rapid rise of magnetic loss and lowering of the initial permeability.
'It is an object of this invention to provide ferrites with a higher {frequency limit than conventional ferrites. The ferrites accordnng to the invention have a composition defined by the formula:
x lies between 0 and 0.25 y lies between 0.15 and 0.6 2 lies between 0.04 and 0.35.
The invention will be better understood from the following description of the method of manufacture of a ferrite.
The raw materials used are the compounds Fe O A1 0 lMn0 CO Li and C00 with a degree of purity higher than 99.5%. The compounds are proportioned by weight, crushed in distilled water for 24 hours in steel ball-mills and dried. The resulting mixture is pre-sintered at 800 C. for 2 hours and crushed once more as above. When dried, the powder is transformed to a granulate by adding by weight of aqueous polyvinyl alcohol solution. The granulate is pressed at a pressure of 1 ton 3,394,082 Patented .luly 23, 1968 "ice per cm. The resulting parts are sintered for 3 hours at a temperature T, between 1100 and 1200 C.
Of course, certain details of the process can be varied without departing from the spirit of the invention. How- 5 ever, it is to be noted that the sintering temperature is relatively critical.
It the sintering temperature is less than 1100 C., the resulting material is crumbly. If the temperature is above 1200" C., the material decomposes.
The following table shows the characteristics of the matenal obtalned, against parameters x, y and z and temperature T ,u being the initial permeability:
15 Example No. x y z T) lfr. m0./s'
What is claimed is:
1. A ferrite composition having low losses in the frequency range between 50 and 200 mc./ s. defined by the formula:
References Cited UNITED STATES PATENTS 2,958,664 11/1960 Vassiliev et a1 252-625 3,007,874 11/1961 Peyssou et a1 252-625 3,030,307 4/1962 Baird et al. 252-625 3,066,103 11/ 1962 Owen 252-625 3,072,576 1/ 1963 Greenhouse 252-625 3,232,877 2/1966 Vassiliev et a1. 252--62.5 3,245,911 4/1966 Vassiliev et al. 252-625 OTHER REFERENCES Aghajanian: High Curie Temperature Square Loop Ferrites, IBM Technical Disclosure Bulletin, page 85,
volume 4, No. 12, May 1962.
TOBIAS E. LEVOW, Primary Examiner.
R. D. EDMONDS, Assistant Examiner.
US406887A 1963-10-30 1964-10-27 Cubic ferrite with a high upper frequency limit Expired - Lifetime US3394082A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR952267A FR1383038A (en) 1963-10-30 1963-10-30 Cubic ferrite with high limit frequency of use

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US3394082A true US3394082A (en) 1968-07-23

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FR (1) FR1383038A (en)
GB (1) GB1072560A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609084A (en) * 1967-05-18 1971-09-28 Ferrites Electroniques Cofelec Lithium ferrite composition for magnetic memory elements and manufacturing process thereof
US5523549A (en) * 1994-05-25 1996-06-04 Ceramic Powders, Inc. Ferrite compositions for use in a microwave oven

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958664A (en) * 1955-01-28 1960-11-01 Steatite Res Corp Making manganese-zinc ferrites
US3007874A (en) * 1957-05-09 1961-11-07 Steatite Res Corp Process of manufacturing ternary ferrites containing manganese and zinc
US3030307A (en) * 1958-04-29 1962-04-17 Sylvania Electric Prod Ferrite material containing lithium and aluminum oxides
US3066103A (en) * 1958-08-07 1962-11-27 Int Standard Electric Corp Manganese ferrites
US3072576A (en) * 1958-05-27 1963-01-08 Aladdin Ind Inc Ferrites having rectangular hysteresis loops and method for manufacture of same
US3232877A (en) * 1960-12-06 1966-02-01 Csf Nickel ferrite containing cobalt and manganese
US3245911A (en) * 1960-12-13 1966-04-12 Csf Ni-mn-al-co-ferrite

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958664A (en) * 1955-01-28 1960-11-01 Steatite Res Corp Making manganese-zinc ferrites
US3007874A (en) * 1957-05-09 1961-11-07 Steatite Res Corp Process of manufacturing ternary ferrites containing manganese and zinc
US3030307A (en) * 1958-04-29 1962-04-17 Sylvania Electric Prod Ferrite material containing lithium and aluminum oxides
US3072576A (en) * 1958-05-27 1963-01-08 Aladdin Ind Inc Ferrites having rectangular hysteresis loops and method for manufacture of same
US3066103A (en) * 1958-08-07 1962-11-27 Int Standard Electric Corp Manganese ferrites
US3232877A (en) * 1960-12-06 1966-02-01 Csf Nickel ferrite containing cobalt and manganese
US3245911A (en) * 1960-12-13 1966-04-12 Csf Ni-mn-al-co-ferrite

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609084A (en) * 1967-05-18 1971-09-28 Ferrites Electroniques Cofelec Lithium ferrite composition for magnetic memory elements and manufacturing process thereof
US5523549A (en) * 1994-05-25 1996-06-04 Ceramic Powders, Inc. Ferrite compositions for use in a microwave oven
US5665819A (en) * 1994-05-25 1997-09-09 Ceramic Powders, Inc. Ferrite compositions for use in a microwave oven

Also Published As

Publication number Publication date
FR1383038A (en) 1964-12-24
GB1072560A (en) 1967-06-21

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