Reliability of ceramic capacitor, past, present and future
- Shonan Institute of Technology, Fujisawa (Japan)
Based on the analysis of TiO{sub 2} and BaTiO{sub 3} ceramic capacitors made in 1943-1960, the effects of MnO{sub 2} additives on reliability are discussed. Okazaki proposed a short-time evaluation of reliability of a minute order at temperature accelerated conditions of 300-550{degrees}C with some examples. The interfaces between the ceramics, the electrodes and the solders of old capacitors were analyzed using a EPMA. The humidity effects of Na+, K+, and Cl{sup -} in electrode materials were also discussed. Recent developments of multilayer capacitors based on ferroelectric and relaxor materials in Japan will be reviewed with the effects of non-stoichiometry in reduced atmosphere, the importance of vacancy control in compositions and others. A hydrothermally synthesized BaTiO{sub 3} powders and an electrode material of Pd coated BaTiO{sub 3} are also discussed. Finally, the future problems such as competition among the size and weight reductions, the cost and the reliability will be reviewed.
- OSTI ID:
- 134887
- Report Number(s):
- CONF-940416--
- Country of Publication:
- United States
- Language:
- English
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