| 摘要 |
PCT No. PCT/JP85/00490 Sec. 371 Date Apr. 17, 1986 Sec. 102(e) Date Apr. 17, 1986 PCT Filed Sep. 2, 1985 PCT Pub. No. WO86/01497 PCT Pub. Date Mar. 13, 1986.A perovskite ceramic is prepared by separately preliminarily calcining raw material powders of two kinds of perovskite ceramic materials having mutually different compositions to form two kinds of perovskite ceramic materials having respective high dielectric constants and mutually different Curie temperatures, crushing and mixing the calcined materials at an adequate ratio, and sintering the mixed materials without forming a and change complete solid solution thereof. The two kinds of perovskite ceramic materials have the formula Pb(Fe2/3W1/3)xi(Fe1/2Nb1/2)1-xiO3, wherein in a first kind of perovskite ceramic material i=1 and 0.1</=x1</=0.2, and in a second kind of ceramic perovskite material i=2 and 0.5</=x2</=0.9, the two kinds of perovskite ceramic material coexisting in the mixing ratio 0.5</=x2/(x1+x2)</=0.8.
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