SU612618A3 - Способ получени ферромагнитной двуокиси хрома - Google Patents
Способ получени ферромагнитной двуокиси хромаInfo
- Publication number
- SU612618A3 SU612618A3 SU752130665A SU2130665A SU612618A3 SU 612618 A3 SU612618 A3 SU 612618A3 SU 752130665 A SU752130665 A SU 752130665A SU 2130665 A SU2130665 A SU 2130665A SU 612618 A3 SU612618 A3 SU 612618A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- chromate
- chromium
- anhydrous
- chromium dioxide
- hydrated
- Prior art date
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- 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
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/54—Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- 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
-
- 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
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Inorganic Chemistry (AREA)
- Composite Materials (AREA)
- Hard Magnetic Materials (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Claims (2)
- Пример I. 2000 г CftO раствор ют в 4 л дистиллированной воды. Раствор помещают в четырехгорлую колбу объемом 10 л, снабженную мешалкой, обратным холодильником и термометром, добавл ют по капл м. 128 г метилового спирта, нагревают смесь до кипени и кип т т в течение 15 час. К 104,6 см полученного раствора, содержащего 50 г безводногоСг С10)2ДОбавл ют при перемешивании 0,178 г SbjOa/ составл ет 0,3% &Ь от веса безводного хромата хрома. Раствор упаривают с последующим высушиванием в вакууме при до получени гидр тированного хромата хрома с 10 молекулами воды. Полученный порошок измельчают, помещают в титановую пробирку объемом 130 MJT, которую загружают в автоклав. Туда же помещают 10 мл дистиллированной воды. В автоклаве создают давление 105 атм путем подачи в него кисло рода и нагревают его в муфельной печи 375°С. Давление при этом достигает 350 атм. Эти услови поддерживают в течение 2 час. Затем автоклав охлажда ют и извлекают порошок двуокиси хрома 90% частиц порошка имеют длину 0,08 0 ,4 мкм при отношении длины к ширине 8:1. Коэрцитивна сила составл ет 440 эрстед. Насыщение намагничивани равно 88 эл ;магн.ед./г. П р и м е р 2. .Процесс ведут по примеру 1. Число молей воды в гидратированном хромате хрома равно 10j а сурьму ввод т в количестве 0,4% от веса безводного хромата. Получают двуокись хрома с коэрцитивной силой 530 эрстед и насыщением намагничивани 88,2 эл.-маги. ед ./г . Формула изобретени Способ получени ферромагнитной двуокиси хрома путем термического разложени гидратированного хромата в присутствии модифицирующей добавки при повышенных температурах и давлении, отличающийс тем, что, с целью повышени коэрцитивной силы ферромагнитной двуокиси хрома, на разложение подают гидратированный хрома, содержащий 9-12 молекул воды,а в качестве модифицирующей добавки используют окись сурьмы, вводимую в количестве 0,2 - 1,8, преимущественно 0,3-0,7% от веса безводного хромата хрома. .Источники информации, прин тые во внимание при экспертизе: 1.Патент Италии № 922283, кл. С 01 q. 37/02, 1972.
- 2.Патент Италии № 956230, кл. С 01 ( 37/02, 1973.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT22489/74A IT1012202B (it) | 1974-05-09 | 1974-05-09 | Procedimento per la produzione di biossido di cromo ferromagnetico |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU612618A3 true SU612618A3 (ru) | 1978-06-25 |
Family
ID=11196949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU752130665A SU612618A3 (ru) | 1974-05-09 | 1975-05-07 | Способ получени ферромагнитной двуокиси хрома |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US3979310A (ru) |
| JP (1) | JPS5521445B2 (ru) |
| AT (1) | AT337140B (ru) |
| BE (1) | BE828887A (ru) |
| BR (1) | BR7502784A (ru) |
| CA (1) | CA1049250A (ru) |
| CH (1) | CH617910A5 (ru) |
| CS (1) | CS324775A2 (ru) |
| DD (1) | DD118050A5 (ru) |
| DE (1) | DE2520030C3 (ru) |
| DK (1) | DK194875A (ru) |
| FR (1) | FR2270206A1 (ru) |
| GB (1) | GB1504166A (ru) |
| IT (1) | IT1012202B (ru) |
| NL (1) | NL7505204A (ru) |
| SE (1) | SE406243B (ru) |
| SU (1) | SU612618A3 (ru) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2861999D1 (en) * | 1977-10-04 | 1982-10-07 | Anvar | Novel ferromagnetic material based on chromium dioxide and rhodium dioxide, and its preparation |
| FR2433483A2 (fr) * | 1978-08-18 | 1980-03-14 | Anvar | Materiau ferromagnetique a base de dioxyde de chrome et de dioxyde de rhodium et son obtention |
| DE3536116A1 (de) * | 1985-10-10 | 1987-04-16 | Basf Ag | Verfahren zur stabilisierung von nadelfoermigem ferromagnetischem chromdioxid |
| US4698220A (en) * | 1986-03-28 | 1987-10-06 | E. I. Du Pont De Nemours And Company | Partitioned reduction process for ferromagnetic chromium dioxide |
| US4769165A (en) * | 1987-01-20 | 1988-09-06 | E. I. Du Pont De Nemours And Company | Process for synthesis of ferromagnetic chromium dioxide |
| DE3728453A1 (de) * | 1987-08-26 | 1989-03-09 | Basf Ag | Verfahren zur herstellung von modifiziertem, ferromagnetischem chromdioxid |
| DE3837646A1 (de) * | 1988-11-05 | 1990-05-10 | Basf Ag | Nadelfoermiges, im wesentlichen aus chromdioxid bestehendes, ferromagnetisches material |
| EP1534634A2 (en) * | 2002-08-29 | 2005-06-01 | Tata Institute of Fundamental Research | Chromium dioxide (cro sb 2 /sb ) and composites of chromium dioxide and other oxides of chromium such as cro sb 2 /sb /cr sb 2 /sb o sb 3 /sb and cro sb 2 /sb /cr sb 2 /sb o sb 5 /sb and process for manufacturing the same |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3034988A (en) * | 1958-08-22 | 1962-05-15 | Du Pont | Modified chromium oxide ferromagnetic compositions, their preparation and use |
| US2923683A (en) * | 1957-06-19 | 1960-02-02 | Du Pont | Antimony-modified chromium oxide ferromagnetic compositions, their preparation and use |
| US3074778A (en) * | 1959-09-24 | 1963-01-22 | Du Pont | Process for producing ferromagnetic chromium oxide |
| US2956955A (en) * | 1960-02-12 | 1960-10-18 | Du Pont | Ferromagnetic chromium oxide and method of making |
| US3117093A (en) * | 1960-10-24 | 1964-01-07 | Du Pont | Process for the preparation of ferromagnetic chromium dioxide |
| US3278263A (en) * | 1964-11-27 | 1966-10-11 | Du Pont | Ferromagnetic chromium dioxide and preparation thereof |
| US3423320A (en) * | 1965-12-14 | 1969-01-21 | Du Pont | Preparation of ferromagnetic chromium dioxide |
| US3449073A (en) * | 1965-12-14 | 1969-06-10 | Du Pont | Process for preparing chromium dioxide and product thereof |
| US3451771A (en) * | 1966-10-27 | 1969-06-24 | Du Pont | Preparation of ferromagnetic cro2 by heating cro3 in the presence of o2 and cr2o3 |
| US3529930A (en) * | 1968-02-13 | 1970-09-22 | Du Pont | Process for improving ferromagnetic properties of chromium dioxide by heating in an oxidizing environment |
| US3450491A (en) * | 1968-08-01 | 1969-06-17 | Du Pont | Preparation of mcr3o8,where m is an alkali metal,from cro3,cr2o3 and m2cr2o7 |
| US3686031A (en) * | 1969-11-26 | 1972-08-22 | Du Pont | Metal phosphate coated ferromagnetic chromium oxide and its preparation |
| DE2022820C3 (de) * | 1970-05-11 | 1980-01-03 | Basf Ag, 6700 Ludwigshafen | Verfahren zur Herstellung von hochkoerzitivem Chromdioxid |
| US3687726A (en) * | 1970-10-19 | 1972-08-29 | Du Pont | Alumina coated chromium dioxide |
| AU452489B2 (en) | 1971-03-04 | 1974-08-16 | Montecatini Edisons. P. A | Process for preparing ferromagnetic chromium dioxide |
| IT956230B (it) * | 1972-04-22 | 1973-10-10 | Montedison Spa | Composizione di biossido di cromo ferromagnetico modificato e p oces so di preparazione |
-
1974
- 1974-05-09 IT IT22489/74A patent/IT1012202B/it active
-
1975
- 1975-04-29 US US05/572,655 patent/US3979310A/en not_active Expired - Lifetime
- 1975-05-02 NL NL7505204A patent/NL7505204A/xx not_active Application Discontinuation
- 1975-05-05 DK DK194875A patent/DK194875A/da not_active Application Discontinuation
- 1975-05-05 SE SE7505168A patent/SE406243B/xx unknown
- 1975-05-05 GB GB18771/75A patent/GB1504166A/en not_active Expired
- 1975-05-06 CH CH602475A patent/CH617910A5/it not_active IP Right Cessation
- 1975-05-06 DE DE2520030A patent/DE2520030C3/de not_active Expired
- 1975-05-07 SU SU752130665A patent/SU612618A3/ru active
- 1975-05-07 DD DD185899A patent/DD118050A5/xx unknown
- 1975-05-07 AT AT351675A patent/AT337140B/de not_active IP Right Cessation
- 1975-05-07 BR BR3554/75A patent/BR7502784A/pt unknown
- 1975-05-07 JP JP5537475A patent/JPS5521445B2/ja not_active Expired
- 1975-05-08 CS CS753247A patent/CS324775A2/cs unknown
- 1975-05-08 CA CA226,540A patent/CA1049250A/en not_active Expired
- 1975-05-09 FR FR7514504A patent/FR2270206A1/fr active Pending
- 1975-05-09 BE BE156193A patent/BE828887A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE828887A (fr) | 1975-11-10 |
| SE406243B (sv) | 1979-01-29 |
| IT1012202B (it) | 1977-03-10 |
| AU8091275A (en) | 1976-11-11 |
| CA1049250A (en) | 1979-02-27 |
| NL7505204A (nl) | 1975-11-11 |
| GB1504166A (en) | 1978-03-15 |
| DD118050A5 (ru) | 1976-02-12 |
| DK194875A (da) | 1975-11-10 |
| DE2520030B2 (de) | 1977-09-15 |
| SE7505168L (sv) | 1975-11-10 |
| JPS5521445B2 (ru) | 1980-06-10 |
| JPS50154798A (ru) | 1975-12-13 |
| ATA351675A (de) | 1976-10-15 |
| CH617910A5 (ru) | 1980-06-30 |
| DE2520030C3 (de) | 1981-07-09 |
| FR2270206A1 (ru) | 1975-12-05 |
| BR7502784A (pt) | 1976-03-16 |
| US3979310A (en) | 1976-09-07 |
| AT337140B (de) | 1977-06-10 |
| DE2520030A1 (de) | 1975-11-13 |
| CS324775A2 (en) | 1987-08-13 |
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