Dielectric ceramic composition

Details Dielectric ceramic composition Dielectric ceramic composition

1992-09-21

1993-10-26

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501134, 501135, 501138, 501139, C04B 3546, C04B 3549

Patent

active

052566390

ABSTRACT:
A dielectric ceramic composition represented by the compositional formula: .sub.x BaO-.sub.y TiO.sub.2 -.sub.z Nd.sub.2 O.sub.3 -.sub.t Sm.sub.2 O.sub.3 -.sub.w Bi.sub.2 O.sub.3 so composed as to be in the molar fractions of 0.06.ltoreq.x.ltoreq.0.25, 0.60.ltoreq.y.ltoreq.0.80, 0.05.ltoreq.z.ltoreq.0.18, 0<t.ltoreq.0.07 and 0<w.ltoreq.0.05, provided that x+y+z+t+w=1, and a compositional range of Y<0.68 and Z>0.15 is excluded. As an additive, at least one of Al.sub.2 O.sub.3, ZrO.sub.2, etc. may be added. Part of Ba may be replaced with at least one of Sr, Ca and Mg. The Sm.sub.2 O.sub.3 and Nd.sub.2 O.sub.3 each may have a purity of at least 70 wt. %.

REFERENCES:
patent: 4330631 (1982-05-01), Kawashima et al.
patent: 4699891 (1987-10-01), Sato et al.
patent: 4753906 (1988-06-01), Nishigaki et al.
patent: 4866017 (1989-09-01), Okawa
patent: 5077247 (1991-12-01), Sato et al.
"A New BaO-TiO.sub.2 compound with Temperature-Stable High Permittivity and Low Microwave Loss", H. M. O'Bryan, Jr. et al, Journal of The American Ceramic Society, vol. 57, No. 10, (1978), pp. 450-453.

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