FR2433483A2 - Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtention - Google Patents
Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtentionInfo
- Publication number
- FR2433483A2 FR2433483A2 FR7824192A FR7824192A FR2433483A2 FR 2433483 A2 FR2433483 A2 FR 2433483A2 FR 7824192 A FR7824192 A FR 7824192A FR 7824192 A FR7824192 A FR 7824192A FR 2433483 A2 FR2433483 A2 FR 2433483A2
- 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
Links
Classifications
-
- 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
- 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
-
- 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
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemically Coating (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Procédé pour l'obtention d'un matériau ferromagnétique à base de dioxyde de chrome et de dioxyde de rhodium. Il comprend la mise en oeuvre concomitante d'au moins un agent dopant complémentaire agissant comme tampon du milieu réactionnel, tel que par exemple l'acide borique, l'acide oxalique ou leurs mélanges, dans un procédé comprenant l'oxydation de Cr2 O3 hydraté ou anhydre où d'un précurseur de Cr2 O3 , en présence d'un composé du rhodium + III susceptible de donner du RhO2 dans les conditions de la réaction et d'un agent oxydant approprié. Application l'obtention d'un matériau ferromagnétique ayant des caractéristiques magnétiques améliorées.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7824192A FR2433483A2 (fr) | 1978-08-18 | 1978-08-18 | Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtention |
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 |
EP78400109A EP0001524B1 (fr) | 1977-10-04 | 1978-09-22 | Nouveau matériau ferromagnétique à base de dioxyde de chrome et de dioxyde de rhodium et son obtention |
IT51342/78A IT1107467B (it) | 1977-10-04 | 1978-10-03 | Procedimento per la produzione di un materiale ferromagnetico a base di biossido di cromo e di biossido di rodio e prodotto ottenuto |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7824192A FR2433483A2 (fr) | 1978-08-18 | 1978-08-18 | Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtention |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2433483A2 true FR2433483A2 (fr) | 1980-03-14 |
FR2433483B2 FR2433483B2 (fr) | 1982-02-19 |
Family
ID=9211941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7824192A Granted FR2433483A2 (fr) | 1977-10-04 | 1978-08-18 | Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtention |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2433483A2 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1298581A (fr) * | 1961-07-12 | 1962-07-13 | Du Pont | Procédé de fabrication de bioxyde de chrome magnétique, produits obtenus et leur utilisation dans les éléments d'enregistrement magnétique |
FR2076109A1 (fr) * | 1970-01-14 | 1971-10-15 | Bayer Ag | |
FR2138160A1 (en) * | 1971-05-19 | 1972-12-29 | Bayer Ag | Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd |
FR2190735A1 (fr) * | 1972-06-30 | 1974-02-01 | Montedison Spa | |
FR2270206A1 (fr) * | 1974-05-09 | 1975-12-05 | Montedison Spa |
-
1978
- 1978-08-18 FR FR7824192A patent/FR2433483A2/fr active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1298581A (fr) * | 1961-07-12 | 1962-07-13 | Du Pont | Procédé de fabrication de bioxyde de chrome magnétique, produits obtenus et leur utilisation dans les éléments d'enregistrement magnétique |
FR2076109A1 (fr) * | 1970-01-14 | 1971-10-15 | Bayer Ag | |
FR2138160A1 (en) * | 1971-05-19 | 1972-12-29 | Bayer Ag | Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd |
FR2190735A1 (fr) * | 1972-06-30 | 1974-02-01 | Montedison Spa | |
FR2270206A1 (fr) * | 1974-05-09 | 1975-12-05 | Montedison Spa |
Non-Patent Citations (2)
Title |
---|
CA1976 * |
EXBK/69 * |
Also Published As
Publication number | Publication date |
---|---|
FR2433483B2 (fr) | 1982-02-19 |
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