US3886077A - Garnet structure ferrimagnetic material having a saturation magnetisation less than 1000 gauss for microwave applications - Google Patents

Garnet structure ferrimagnetic material having a saturation magnetisation less than 1000 gauss for microwave applications Download PDF

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Publication number
US3886077A
US3886077A US346245A US34624573A US3886077A US 3886077 A US3886077 A US 3886077A US 346245 A US346245 A US 346245A US 34624573 A US34624573 A US 34624573A US 3886077 A US3886077 A US 3886077A
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gauss
garnet structure
saturation magnetisation
less
temperature
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US346245A
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Jean Nicolas
Alain Lagrange
Roland Sroussi
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Thales SA
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Thomson CSF 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
    • C04B35/2641—Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, 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
    • C04B35/2675—Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets

Definitions

  • the present invention relates to a ferrimagnetic material of garnet structure, which is particularly suitable for microwave applications in the range extending from some few hundred to some few thousand Mc/s.
  • yttrium garnet of the formula Y Fe 0 having a saturation magnetisation of 1750 gauss at ambient temperature, and a gyroresonance line width (measured at Gc/s) of around 50 oersteds. Its dielectric losses (measured at 10 Gc/s) can be very low indeed (tg8 l0 At relatively low frequencies, for example two Gc/s, it is frequently necessary to have materials which possess a small saturation magnetisation, less than 900 gauss for example. To achieve this result, means are known such as the substitution of aluminum or gallium for iron, or of gadolinium for yttrium in the case of yttrium garnet.
  • the invention relates to a material of low saturation magnetisation (less than 1000 gauss) having at one and the same time a high stability as a function of temperature and quite narrow line widths.
  • Garnet structure ferrimagnetic material in accordance with the invention has a general chemical composition satisfying the formula:
  • This material can be obtained in the following manner: basic materials are chosen (for example iron oxide, yttrium oxide, gadolinium oxide, calcium carbonate, tin oxide and alumina) which have very high purity, especially in the case of yttrium and gadolinium oxides, which should have a purity of better than 99.95%; these materials are weighed and mixed in accordance with the recipe described by the general formula in which, at the start, e is replaced by e, the latter being made equal to 0.035 in the case, described hereinafter, of two successive operations of crushing the material in steel jars utilizing steel balls.
  • the firing losses of the different oxides are taken into account, that is to say the losses in water and organic materials, incurred during later heat treatments.
  • the fired product is then crushed in steel jars using steel balls, in a water environment, for 48 hours. It is then dried, screened and mixed with an organic binder such as an aqueous solution of 10% of polyvinyl alcohol. The product thus obtained is screened again to obtain a granulate suitable for introduction into moulds,
  • manufacture is specified as follows:
  • 41rM is the saturation magnetisation in gauss, measured at ambient temperature (in the order of 20 C although this value is not critical because of the high stability of the materials in accordance with the invention);
  • 6' is the dielectric constant in U.E.M.C.G.S.;
  • tg8 is the tangent of the dielectric loss angle measured at a frequency of 8.2 Gc/s;
  • g is the gyromagnetic factor
  • AH is the width in oersteds of the gyromagnetic resonance line measured at 9.5 Gc/s on a 1 mm diameter sphere;
  • K and K are the temperature coefficients of the saturation magnetisation 41rM between the following temperatures:
  • AH lg/cm
  • FIG. 2 similar to FIG. I, shows in respect of this second example that good stability is achieved in the practical range of application.
  • Table II listed hereinafter repeats the characteristics set out in table I, an extra column being added for the parameter AH which is in oersteds.
  • the specific manufacturing conditions are the same as in the second example, except as far as the sintering temperatures (here from l400 to 1485 C).
  • Ferrimagnetic polycrystaline garnet structure material having the general formula:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Magnetic Ceramics (AREA)
US346245A 1972-03-31 1973-03-30 Garnet structure ferrimagnetic material having a saturation magnetisation less than 1000 gauss for microwave applications Expired - Lifetime US3886077A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7211633A FR2177632B1 (fr) 1972-03-31 1972-03-31

Publications (1)

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US3886077A true US3886077A (en) 1975-05-27

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US (1) US3886077A (fr)
JP (1) JPS498798A (fr)
BE (1) BE797370A (fr)
DE (1) DE2315558C3 (fr)
FR (1) FR2177632B1 (fr)
GB (1) GB1382555A (fr)
IT (1) IT980076B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4614923A (en) * 1984-02-21 1986-09-30 Selenia Industrie Elettroniche Associate Spa Method of suppressing magnetostatic waves in magnetic garnet films for microwave circuit applications
US5801604A (en) * 1996-01-11 1998-09-01 Murata Manufacturing Co., Ltd. Magnetostatic wave device with indium/tin in the magnetic garnet
US5902514A (en) * 1996-10-31 1999-05-11 Electronics And Telecommunications Research Institute Magnetic ceramic composition for use in microwave devices, magnetic ceramics for use in microwave devices, and preparation method therefor
US20050068122A1 (en) * 2003-09-25 2005-03-31 Alps Electric Co., Ltd. Garnet ferrite having a small absolute value of temperature coefficient of 4piMs and a small ferromagnetic resonance half-width, and a non-reciprocal circuit element applying the same
US20050260331A1 (en) * 2002-01-22 2005-11-24 Xingwu Wang Process for coating a substrate
WO2017089575A1 (fr) * 2015-11-27 2017-06-01 Thales Materiau ferrite de type grenat a tres faible aimantation a saturation et composant comprenant ledit materiau a tres faible aimantation a saturation
CN114436637A (zh) * 2022-03-07 2022-05-06 西南应用磁学研究所(中国电子科技集团公司第九研究所) 一种高介电常数高功率微波铁氧体材料及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4929077B1 (fr) * 1970-10-12 1974-08-01
JPS6024568B2 (ja) * 1975-05-19 1985-06-13 日立金属株式会社 Ｇｄ，Ｃａ，Ｓｎ置換イツトリウム鉄ガ−ネツト
JPS5642311A (en) * 1979-09-17 1981-04-20 Hitachi Ltd Garnet film for magnetic bubble
FR2586134B1 (fr) * 1985-08-06 1989-12-01 Thomson Csf Materiau magnetique stable en temperature pour utilisation en hyperfrequences et son procede de fabrication

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479292A (en) * 1965-12-20 1969-11-18 Bell Telephone Labor Inc Manufacture of garnet ceramic
US3563897A (en) * 1968-04-03 1971-02-16 Trans Tech Inc Ferromagnetic garnet with stress insensitive b-h loop and method of making same
US3657131A (en) * 1969-04-17 1972-04-18 Thomson Csf Magnetic garnets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3479292A (en) * 1965-12-20 1969-11-18 Bell Telephone Labor Inc Manufacture of garnet ceramic
US3563897A (en) * 1968-04-03 1971-02-16 Trans Tech Inc Ferromagnetic garnet with stress insensitive b-h loop and method of making same
US3657131A (en) * 1969-04-17 1972-04-18 Thomson Csf Magnetic garnets

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4614923A (en) * 1984-02-21 1986-09-30 Selenia Industrie Elettroniche Associate Spa Method of suppressing magnetostatic waves in magnetic garnet films for microwave circuit applications
US5801604A (en) * 1996-01-11 1998-09-01 Murata Manufacturing Co., Ltd. Magnetostatic wave device with indium/tin in the magnetic garnet
US5902514A (en) * 1996-10-31 1999-05-11 Electronics And Telecommunications Research Institute Magnetic ceramic composition for use in microwave devices, magnetic ceramics for use in microwave devices, and preparation method therefor
US20050260331A1 (en) * 2002-01-22 2005-11-24 Xingwu Wang Process for coating a substrate
US20050068122A1 (en) * 2003-09-25 2005-03-31 Alps Electric Co., Ltd. Garnet ferrite having a small absolute value of temperature coefficient of 4piMs and a small ferromagnetic resonance half-width, and a non-reciprocal circuit element applying the same
WO2017089575A1 (fr) * 2015-11-27 2017-06-01 Thales Materiau ferrite de type grenat a tres faible aimantation a saturation et composant comprenant ledit materiau a tres faible aimantation a saturation
FR3044308A1 (fr) * 2015-11-27 2017-06-02 Thales Sa Materiau ferrite de type grenat a tres faible aimantation a saturation et composant comprenant ledit materiau a tres faible aimantation a saturation
FR3044309A1 (fr) * 2015-11-27 2017-06-02 Thales Sa Materiau ferrite de type grenat a tres faible aimantation a saturation et composant comprenant ledit materiau a tres faible aimantation a saturation
CN114436637A (zh) * 2022-03-07 2022-05-06 西南应用磁学研究所(中国电子科技集团公司第九研究所) 一种高介电常数高功率微波铁氧体材料及其制备方法

Also Published As

Publication number Publication date
DE2315558A1 (de) 1973-10-04
DE2315558B2 (de) 1980-06-04
FR2177632A1 (fr) 1973-11-09
GB1382555A (en) 1975-02-05
JPS498798A (fr) 1974-01-25
BE797370A (fr) 1973-07-16
FR2177632B1 (fr) 1978-03-03
IT980076B (it) 1974-09-30
DE2315558C3 (de) 1981-02-26

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