GB981143A - Ferromagnetic ferrite materials for use at microwave frequencies - Google Patents

Ferromagnetic ferrite materials for use at microwave frequencies

Info

Publication number
GB981143A
GB981143A GB626363A GB626363A GB981143A GB 981143 A GB981143 A GB 981143A GB 626363 A GB626363 A GB 626363A GB 626363 A GB626363 A GB 626363A GB 981143 A GB981143 A GB 981143A
Authority
GB
United Kingdom
Prior art keywords
sintering
tio
components
hours
niofe
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
GB626363A
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 GB981143A publication Critical patent/GB981143A/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
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead
    • 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
    • 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
    • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices

Abstract

981,143. Magnetic compositions. STANDARD TELEPHONES & CABLES Ltd. Feb. 15, 1963 [Feb. 22, 1962; Jan. 23, 1963], No. 6263/63. Heading H1H. A ferromagnetic ferrite material of spinel crystal structure and suitable for microwave devices requiring stable thermal properties has the formula where x+y= 100 and 0.5 # y # 90, and L and Q represent one or more of the bivalent metals Fe<SP>**</SP>, Mn<SP>**</SP>, Co<SP>**</SP>, Ni<SP>**</SP>, Mg<SP>**</SP>, Zn<SP>**</SP>, R represents one or more of the trivalent metals Fe<SP>***</SP>, Cr<SP>***</SP>, Al<SP>***</SP>, Ga<SP>***</SP>, Mn<SP>***</SP>, Ti is quadrivalent titanium, and Fe 2 O comprises at least ¥ of the R 2 O 3 . Essentially the material is a solid solution of the two components (LOR 2 O 3 ) and (TiO 2 2QO), both of which have similar spinel crystal structures, and is preferably made by sintering a mixture of these two components in powdered form. The two components may each have undergone a presintering in air at 1000‹ C. for an hour prior to the main sintering. The main sintering, which is carried out after the powder mixture has been pressed into shape, comprises a slow rise in temperature to 800‹ C. over several hours, 4 to 5 hours at 1200‹ C. and slow cooling over 20 hours, all in O 2 . The alternative process of sintering from the constituent metal oxides is also envisaged. Specific examples disclosed are 70(NiOFe 2 O 3 ) + 30(TiO 2 2ZnO), 90(NiOFe 2 O 3 ) + 10(TiO 2 2MgO), 90(0.92MgO, 0.18- MnO, 0.90Fe 2 O 2 ) + 10(T 1 O 2 . 2ZnO). The material may be used in a Faraday rotator and in a phase-shifter where a constant phase-shift over the temperature range 0-120‹ C. may be obtained.
GB626363A 1962-02-22 1963-02-15 Ferromagnetic ferrite materials for use at microwave frequencies Expired GB981143A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR888809A FR1323583A (en) 1962-02-22 1962-02-22 Ferromagnetic materials and manufacturing methods
FR922334A FR1354231A (en) 1962-02-22 1963-01-23 Ferromagnetic materials and manufacturing methods

Publications (1)

Publication Number Publication Date
GB981143A true GB981143A (en) 1965-01-20

Family

ID=26194494

Family Applications (1)

Application Number Title Priority Date Filing Date
GB626363A Expired GB981143A (en) 1962-02-22 1963-02-15 Ferromagnetic ferrite materials for use at microwave frequencies

Country Status (5)

Country Link
BE (1) BE628751A (en)
CH (1) CH448294A (en)
FR (2) FR1323583A (en)
GB (1) GB981143A (en)
NL (1) NL289192A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1430189A (en) * 1964-12-29 1966-03-04 Lignes Telegraph Telephon Ferromagnetic materials and processes for their manufacture
DE1276534B (en) * 1965-05-10 1968-08-29 Philips Patentverwaltung Process for the production of a ferromagnetic ferrite material with a hexagonal crystal structure

Also Published As

Publication number Publication date
FR1323583A (en) 1963-04-12
CH448294A (en) 1967-12-15
BE628751A (en) 1963-08-22
NL289192A (en) 1965-03-25
FR1354231A (en) 1964-03-06

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