FR2138160A1 - Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd - Google Patents
Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpdInfo
- Publication number
- FR2138160A1 FR2138160A1 FR7218148A FR7218148A FR2138160A1 FR 2138160 A1 FR2138160 A1 FR 2138160A1 FR 7218148 A FR7218148 A FR 7218148A FR 7218148 A FR7218148 A FR 7218148A FR 2138160 A1 FR2138160 A1 FR 2138160A1
- Authority
- FR
- France
- Prior art keywords
- pref
- atm
- degrees
- cpd
- heating
- 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.)
- Withdrawn
Links
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 title abstract 5
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 title abstract 5
- 230000005294 ferromagnetic effect Effects 0.000 title abstract 2
- 238000010438 heat treatment Methods 0.000 title abstract 2
- 229940090961 chromium dioxide Drugs 0.000 title 1
- 229940117975 chromium trioxide Drugs 0.000 title 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 title 1
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 title 1
- 229910052714 tellurium Inorganic materials 0.000 title 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 title 1
- 230000005291 magnetic effect Effects 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229910052733 gallium Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- FXADMRZICBQPQY-UHFFFAOYSA-N orthotelluric acid Chemical group O[Te](O)(O)(O)(O)O FXADMRZICBQPQY-UHFFFAOYSA-N 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/34—Compounds of chromium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Ferromagnetic CrO2 modified with telluric acid is prepd. by (a) heating CrO3 in the presence of water and >=1 finely divided cpd. of formula: A2TeO6 (where A is Cr, Fe, Al, Ga and/or Mn) which is in the form of a rutile or trirutile lattice, at 100-300 degrees C pref. 200-300 degrees C under a pressure of 1-500 atm. pref. 50-300 atm. to form CrO2 mixed phase cores, and (b) hydrothermally converting the cores with further CrO3 and water at 100-450 degrees C pref. 280-420 degrees C under a pressure of 1-500 atm. pref. 100-400 atm. Used for magnetic impulse registration and reproduction, e.g. on magnetic tapes and drums. Material has excellent magnetic props., esp. a high value of the remanence of coercive force, and favourable particle size.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712124812 DE2124812A1 (en) | 1971-05-19 | 1971-05-19 | Process for the production of ferromagnetic chromium dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2138160A1 true FR2138160A1 (en) | 1972-12-29 |
Family
ID=5808310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7218148A Withdrawn FR2138160A1 (en) | 1971-05-19 | 1972-05-19 | Ferromagnetic chromium dioxide prepn by two stages - heating chromium trioxide with tellurium cpd |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE783763A (en) |
| DE (1) | DE2124812A1 (en) |
| FR (1) | FR2138160A1 (en) |
| IT (1) | IT957902B (en) |
| NL (1) | NL7206854A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001524A1 (en) * | 1977-10-04 | 1979-04-18 | ANVAR Agence Nationale de Valorisation de la Recherche | Novel ferromagnetic material based on chromium dioxide and rhodium dioxide, and its preparation |
| FR2405220A1 (en) * | 1977-10-04 | 1979-05-04 | Anvar | Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide |
| EP0007764A1 (en) * | 1978-07-21 | 1980-02-06 | Montedison S.p.A. | Stabilized ferromagnetic chromium dioxide and a process for preparing it |
| FR2433483A2 (en) * | 1978-08-18 | 1980-03-14 | Anvar | Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide |
| FR2502384A1 (en) * | 1981-03-17 | 1982-09-24 | Centre Nat Rech Scient | NEW FERROMAGNETIC MATERIAL BASED ON CHROMIUM AND IRIDIUM, ITS OBTAINING AND APPLICATION AS RECORDING MATERIAL |
| EP0146127A3 (en) * | 1983-12-16 | 1987-06-16 | E.I. Du Pont De Nemours And Company | Controlled initiation chromium dioxide synthesis |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109467433B (en) * | 2018-12-14 | 2021-03-30 | 电子科技大学 | Co-Ti-Ta-based dielectric ceramic material and preparation method thereof |
-
1971
- 1971-05-19 DE DE19712124812 patent/DE2124812A1/en active Pending
-
1972
- 1972-05-17 IT IT5029172A patent/IT957902B/en active
- 1972-05-19 NL NL7206854A patent/NL7206854A/xx unknown
- 1972-05-19 BE BE783763A patent/BE783763A/en unknown
- 1972-05-19 FR FR7218148A patent/FR2138160A1/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0001524A1 (en) * | 1977-10-04 | 1979-04-18 | ANVAR Agence Nationale de Valorisation de la Recherche | Novel ferromagnetic material based on chromium dioxide and rhodium dioxide, and its preparation |
| FR2405220A1 (en) * | 1977-10-04 | 1979-05-04 | Anvar | Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide |
| US4311770A (en) * | 1977-10-04 | 1982-01-19 | Agence Nationale De Valorisation De La Recherche (Anvar) | Novel ferromagnetic chromium dioxide and rhodium dioxide material and its preparation |
| EP0007764A1 (en) * | 1978-07-21 | 1980-02-06 | Montedison S.p.A. | Stabilized ferromagnetic chromium dioxide and a process for preparing it |
| FR2433483A2 (en) * | 1978-08-18 | 1980-03-14 | Anvar | Ferromagnetic cpd. with improved magnetic properties - consists of a solid soln. of chromium di:oxide and rhodium di:oxide |
| FR2502384A1 (en) * | 1981-03-17 | 1982-09-24 | Centre Nat Rech Scient | NEW FERROMAGNETIC MATERIAL BASED ON CHROMIUM AND IRIDIUM, ITS OBTAINING AND APPLICATION AS RECORDING MATERIAL |
| EP0146127A3 (en) * | 1983-12-16 | 1987-06-16 | E.I. Du Pont De Nemours And Company | Controlled initiation chromium dioxide synthesis |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2124812A1 (en) | 1972-11-30 |
| NL7206854A (en) | 1972-11-21 |
| BE783763A (en) | 1972-11-20 |
| IT957902B (en) | 1973-10-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RE | Withdrawal of published application |