Semiconducting ceramic compositions
Abstract
Abstract Ceramic semiconducting compositions are provided herein in which compositions consist primarily of BaTiO3 and minor amounts of Bi2O3 and TiO2 in the proportions defined in FIG. 1 of the drawings under the Region described by line A-B-C-D-E-F-G and which compositions further contain 0.01 to 4 mol % of MnO2. The disclosure also provides for a method of producing compositions having the aforementioned proportions by mixing the oxides defined by FIG. 1 with MnO2, pressing the ceramic composition into the desired shape and then sintering the compositions in air, followed by reducing the compositions in a reducing atmosphere at elevated temperatures. Ceramics produced from the compositions described above exhibit a large capacitance among other desirably electrical properties and may be conveniently produced in a small compact form.
Inventors
- 👤 Hisayoshi Ueoka
- 👤 Kazuo Horii
- 👤 Kazumasa Umeya
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |