GB849938A - Dielectric ceramic compositions and the method of production thereof - Google Patents
Dielectric ceramic compositions and the method of production thereofInfo
- Publication number
- GB849938A GB849938A GB3385757A GB3385757A GB849938A GB 849938 A GB849938 A GB 849938A GB 3385757 A GB3385757 A GB 3385757A GB 3385757 A GB3385757 A GB 3385757A GB 849938 A GB849938 A GB 849938A
- Authority
- GB
- United Kingdom
- Prior art keywords
- barium titanate
- barrier layer
- firing
- temperature
- thin
- 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.)
- Expired
Links
Classifications
-
- 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
- C04B35/46—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 titanium oxides or titanates
- C04B35/462—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 titanium oxides or titanates based on titanates
- C04B35/465—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
- C04B35/4682—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 titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1272—Semiconductive ceramic capacitors
- H01G4/1281—Semiconductive ceramic capacitors with grain boundary layer
Abstract
A ceramic dielectric for capacitors is prepared by making powdered barium titanate of high purity into a form, firing the form in a reducing atmosphere at a temperature between 1330 DEG C. and p 1550 DEG C. until all the barium titanate is transformed to its hexagonal polymorph, cooling the form over a temperature range of 1330 DEG C. to 1000 DEG C. for an hour or less and then firing the form in an oxidising atmosphere for one to five hours at 1000 DEG C. to 650 DEG C. This forms a barrier layer dielectric since during the oxidation process the granules of barium titanate (diameter of of about 1 micron) become surrounded by a very thin (about 100 ) barrier layer, the material as such being substantially electrically conductive but in the form of grains mutually isolated by thin insulating films.ALSO:A method of manufacturing an inter granular barrier layer ceramic dielectric for capacitors includes the steps of making powdered barium titanate of high purity into a form, firing the form in a reducing atmosphere at a temperature between 1330 DEG C. and 1550 DEG C. until all the barium titanate is transformed to its hexagonal polymorph cooling the form over a temperature range of approximately 1330 DEG C. to 1000 DEG C. for approximately an hour or less and then firing the form in an oxidising atmosphere for one to five hours at a temperature between 1000 DEG C. and 650 DEG C. This forms a barrier layer dielectric since during the oxidation process the granules of barium titanate (diameter of about 1 micron) become surrounded by a very thin (about 100 ) barrier layer, the material as such being substantially electrically conductive but in the form of grains mutually isolated by thin insulating films.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3385757A GB849938A (en) | 1957-10-30 | 1957-10-30 | Dielectric ceramic compositions and the method of production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3385757A GB849938A (en) | 1957-10-30 | 1957-10-30 | Dielectric ceramic compositions and the method of production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB849938A true GB849938A (en) | 1960-09-28 |
Family
ID=10358337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3385757A Expired GB849938A (en) | 1957-10-30 | 1957-10-30 | Dielectric ceramic compositions and the method of production thereof |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB849938A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1253627B (en) * | 1963-02-22 | 1967-11-02 | Nippon Telegraph & Telephone | Process for the production of a ceramic dielectric |
| US4280846A (en) | 1978-08-01 | 1981-07-28 | Thomson-Csf | Method of fabrication of dielectric material having volume-distributed insulating barriers for use at high voltages and a ceramic body fabricated by said method |
| FR2555155A1 (en) * | 1983-11-18 | 1985-05-24 | Otsuka Chemical Co Ltd | MODIFIED ALKALI METAL TITANATES AND PROCESS FOR THEIR PREPARATION |
| DE3442258A1 (en) * | 1983-11-21 | 1985-05-30 | Otsuka Chemical Co., Ltd., Osaka | METHOD FOR PRODUCING METAMORPHENE TITANIC ACID COMPOUNDS |
-
1957
- 1957-10-30 GB GB3385757A patent/GB849938A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1253627B (en) * | 1963-02-22 | 1967-11-02 | Nippon Telegraph & Telephone | Process for the production of a ceramic dielectric |
| US4280846A (en) | 1978-08-01 | 1981-07-28 | Thomson-Csf | Method of fabrication of dielectric material having volume-distributed insulating barriers for use at high voltages and a ceramic body fabricated by said method |
| FR2555155A1 (en) * | 1983-11-18 | 1985-05-24 | Otsuka Chemical Co Ltd | MODIFIED ALKALI METAL TITANATES AND PROCESS FOR THEIR PREPARATION |
| DE3441854A1 (en) * | 1983-11-18 | 1985-05-30 | Otsuka Chemical Co., Ltd., Osaka | METAMORPHAL ALKALINE METAL TITANATES AND METHOD FOR THE PRODUCTION THEREOF |
| GB2150543A (en) * | 1983-11-18 | 1985-07-03 | Otsuka Chemical Co Ltd | Metamorphosed alkali metal titanates |
| DE3442258A1 (en) * | 1983-11-21 | 1985-05-30 | Otsuka Chemical Co., Ltd., Osaka | METHOD FOR PRODUCING METAMORPHENE TITANIC ACID COMPOUNDS |
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