GB820855A - Ferromagnetic ceramic materials with rectangular hysteresis cycle - Google Patents

Ferromagnetic ceramic materials with rectangular hysteresis cycle

Info

Publication number
GB820855A
GB820855A GB439757A GB439757A GB820855A GB 820855 A GB820855 A GB 820855A GB 439757 A GB439757 A GB 439757A GB 439757 A GB439757 A GB 439757A GB 820855 A GB820855 A GB 820855A
Authority
GB
United Kingdom
Prior art keywords
boron
oxides
mol
mno
per cent
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
GB439757A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB820855A publication Critical patent/GB820855A/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

Abstract

820,855. Magnetic compositions. STANDARD TELEPHONES & CABLES Ltd. Feb. 8, 1957 [Feb. 14, 1956], No. 4397/57. Drawings to Specification. Class 38 (2). A ferromagnetic ferrite having a rectangular hysteresis loop is made by mixing together 23- 52 mol. per cent of ferric oxide up to 25% of which may be replaced by aluminium and/or chromium oxides, 33-77 mol. per cent of manganese oxide or manganese and magnesium oxides, 0-15 mol. per cent of zinc and/or chromic oxides, and 0.02-0.5% by weight of boron in the form of sodium borate or boric acid, compressing the mixture, heating it at 1150-1350‹ C. in nitrogen containing up to 2% by volume of oxygen, and cooling in pure nitrogen. Curves are given showing how the coercive force, magnetic induction, and coefficient of rectangularity vary with change of boron content from 0.02 to 0.20%, for manganese ferrite comprising MnO and Fe 2 O 3 in equal molecular proportions, to which sodium borate has been added. The ferrite is made by grinding the starting mixture (which may include MnO or Mn 3 O 4 ) in water in a ball mill, and heating at 1230‹ C. for 4 hours in nitrogen containing 1% by volume of oxygen, and cooling in pure nitrogen. Hysteresis curves and other information of their magnetic properties are given for the material containing no and 0.04% by weight of boron. A material incorporating oxides in the following molecular percentages: Fe 2 O 3 , 46.8%; MnO, 32.8%; ZnO, 6.9%; MgO, 13.5% was produced by a similar process except that the sintering temperature was 1275‹ C. Characteristics are quoted of the material with no boron and with additions of sodium borate and boric acid. Specification 820,853 is referred to.
GB439757A 1956-02-14 1957-02-08 Ferromagnetic ceramic materials with rectangular hysteresis cycle Expired GB820855A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1142675T 1956-02-14

Publications (1)

Publication Number Publication Date
GB820855A true GB820855A (en) 1959-09-30

Family

ID=9643438

Family Applications (1)

Application Number Title Priority Date Filing Date
GB439757A Expired GB820855A (en) 1956-02-14 1957-02-08 Ferromagnetic ceramic materials with rectangular hysteresis cycle

Country Status (2)

Country Link
FR (1) FR1142675A (en)
GB (1) GB820855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671436A (en) * 1969-03-20 1972-06-20 Philips Corp Method of manufacturing a sintered oxidic ferromagnetic body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671436A (en) * 1969-03-20 1972-06-20 Philips Corp Method of manufacturing a sintered oxidic ferromagnetic body

Also Published As

Publication number Publication date
FR1142675A (en) 1957-09-20

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