FR2405220A1 - Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide - Google Patents

Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide

Info

Publication number
FR2405220A1
FR2405220A1 FR7729857A FR7729857A FR2405220A1 FR 2405220 A1 FR2405220 A1 FR 2405220A1 FR 7729857 A FR7729857 A FR 7729857A FR 7729857 A FR7729857 A FR 7729857A FR 2405220 A1 FR2405220 A1 FR 2405220A1
Authority
FR
France
Prior art keywords
cpd
oxide
ferromagnetic
rho2
cro2
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.)
Granted
Application number
FR7729857A
Other languages
French (fr)
Other versions
FR2405220B1 (en
Inventor
Gerard Demazeau
Patrick Maestro
Theophile Plante
Michel Pouchard
Paul Hagenmuller
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.)
Bpifrance Financement SA
Original Assignee
Agence National de Valorisation de la Recherche ANVAR
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 Agence National de Valorisation de la Recherche ANVAR filed Critical Agence National de Valorisation de la Recherche ANVAR
Priority to FR7729857A priority Critical patent/FR2405220A1/en
Priority to EP78400109A priority patent/EP0001524B1/en
Priority to DE7878400109T priority patent/DE2861999D1/en
Priority to US05/945,007 priority patent/US4311770A/en
Priority to BE190692A priority patent/BE870744A/en
Priority to JP12190278A priority patent/JPS5461099A/en
Priority to IT51342/78A priority patent/IT1107467B/en
Publication of FR2405220A1 publication Critical patent/FR2405220A1/en
Application granted granted Critical
Publication of FR2405220B1 publication Critical patent/FR2405220B1/fr
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G55/00—Compounds of ruthenium, rhodium, palladium, osmium, iridium, or platinum
    • C01G55/002—Compounds containing, besides ruthenium, rhodium, palladium, osmium, iridium, or platinum, two or more other elements, with the exception of oxygen or hydrogen
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/02—Oxides or hydrates thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G55/00—Compounds of ruthenium, rhodium, palladium, osmium, iridium, or platinum
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
    • G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
    • G11B5/70636—CrO2
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/50—Solid solutions
    • C01P2002/52—Solid solutions containing elements as dopants
    • C01P2002/54—Solid solutions containing elements as dopants one element only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
    • C01P2002/77—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by unit-cell parameters, atom positions or structure diagrams
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/32—Thermal properties
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/42—Magnetic properties

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Compounds Of Iron (AREA)
  • Chemically Coating (AREA)

Abstract

Ferromagnetic cpd. based on CrO2 and RhO2 of formula Cr1-xRhxO2 (where x is 0-0.5 (is approx. 0.1)), is mfd. by oxidn. at 350-500 degrees C and >400 bar, of hydrated Cr2O3 or its precursor, in the presence of an appropriate amt. of Rh (III) cpd. which forming RhO2 under the conditions of the reaction; and an oxygenerated cpd. free of metallic cations other than Cr, which does not lead to the preferential or parasitic formation of chromates, bichromates or any other cpd. with degree of oxidn. >4. A partial pressure of oxygen at least equal to those corresponding to the equilibrium Cr2O3+1/2O2. >=2 CrO2 and Rh2O3+1/2O2 >=2 RhO2. is provided, opt. together with water of dilution and/or >=1 dopant acting as buffer in the reaction medium and a classical modifier. The cpd. exhibits improved magnetic proportion c.f. unmodified CrO2.
FR7729857A 1977-10-04 1977-10-04 Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide Granted FR2405220A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FR7729857A FR2405220A1 (en) 1977-10-04 1977-10-04 Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide
EP78400109A EP0001524B1 (en) 1977-10-04 1978-09-22 Novel ferromagnetic material based on chromium dioxide and rhodium dioxide, and its preparation
DE7878400109T DE2861999D1 (en) 1977-10-04 1978-09-22 Novel ferromagnetic material based on chromium dioxide and rhodium dioxide, and its preparation
US05/945,007 US4311770A (en) 1977-10-04 1978-09-22 Novel ferromagnetic chromium dioxide and rhodium dioxide material and its preparation
BE190692A BE870744A (en) 1977-10-04 1978-09-25 NEW FERROMAGNETIC MATERIAL BASED ON CHROME DIOXIDE AND RHODIUM DIOXIDE AND ITS OBTAINING
JP12190278A JPS5461099A (en) 1977-10-04 1978-10-03 Novel highhmagnetic chromium dioxide and rhodium dioxide material*its manufacture and magnetic recording element made therefrom
IT51342/78A IT1107467B (en) 1977-10-04 1978-10-03 PROCEDURE FOR THE PRODUCTION OF A FERROMAGNETIC MATERIAL BASED ON CHROMIUM DIOXIDE AND RHODIUM DIOXIDE AND PRODUCT OBTAINED

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7729857A FR2405220A1 (en) 1977-10-04 1977-10-04 Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide

Publications (2)

Publication Number Publication Date
FR2405220A1 true FR2405220A1 (en) 1979-05-04
FR2405220B1 FR2405220B1 (en) 1981-06-19

Family

ID=9196089

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7729857A Granted FR2405220A1 (en) 1977-10-04 1977-10-04 Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide

Country Status (3)

Country Link
JP (1) JPS5461099A (en)
BE (1) BE870744A (en)
FR (1) FR2405220A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138160A1 (en) * 1971-05-19 1972-12-29 Bayer Ag Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138160A1 (en) * 1971-05-19 1972-12-29 Bayer Ag Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd

Also Published As

Publication number Publication date
FR2405220B1 (en) 1981-06-19
BE870744A (en) 1979-03-26
JPS6316342B2 (en) 1988-04-08
JPS5461099A (en) 1979-05-17

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Legal Events

Date Code Title Description
ST Notification of lapse