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Primary Examiner: Kucia, Richard R.
Assistant Examiner:
Attorney: Connolly and Hutz

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Title: Ceramic capacitor having a dielectric of (Pb,La) (Zr,Ti)O.sub.3 and BaTiO.sub.3

Abstract: A ceramic capacitor has a dielectric body including a ceramic and a low melting flux. The ceramic consists of a major proportion of an antiferroelectric lead lanthanum zirconate titanate and a minor proportion of a barium titanate. The body may also include up to 10 weight percent of a low melting flux, which is especially useful in monolithic ceramic capacitors having buried silver-containing electrodes. These dielectric bodies exhibit at moderate voltage stress levels an improved combination of properties including a high dielectric constant that is relatively stable with changing voltage and temperature.

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Inventors: Maher, Galeb H. (North Adams, MA, US)

Application Number: 002837
Filing Date: 1979-01-12
Publication_date: 1980-08-26
Assignee: Sprague Electric Company (North Adams, MA)
Primary Class(es): 361/321.4 252/572, 361/322, 501/2, 501/134
Other Classes:
US Patent Ref:

2541833	Feb, 1951	Roberts	252/63.
3440067	Apr, 1969	Fujiwara	361/321.
3732117	May, 1973	Nitta	252/63.
4027209	May, 1977	Maher	361/321.

Other Refs: 209327950-8340751-42760

Jan, 1972	FR
Nov, 1973	JP
Nov, 1976	JP

Other References: G. Haertling, Hot Pressed (Pb,La)Zr,Ti)O.sub.3 Ferroelectric Ceramics for Electrooptic Applications, J. Amer. Ceramics Soc., v. 54, #1, Jan. 71, pp. 1-11.
T. Ikeda, Studies of (Ba-Pb)(Ti-Zr)O.sub.3 System, J. Physical Society of Japan, vol. II, #2, Feb. 1969, pp. 168-174.
Shepard Roberts, Dielectric Properties of Lead Zirconate and Barium-Lead Zirconate, J. of Am. Ceramic Soc., vol. 33, #2, 1950, pp. 63-66.