Capacitors and high dielectric constant ceramics therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 18, 1990
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention relates to the production of ceramic materials which exhibit a dielectric constant in excess of 105, when measured at room temperature, and a small temperature coefficient of capacitance across the temperature range of -55.degree. to 125.degree. C., when compared to the capacitance measured at room temperature, which material has a composition encompassed within one of the following general formulae: (Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m O.sub.3m+1).sup.2- ; (I) (Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Zr.sub..beta. O.sub.3m+.delta.+1).sup.2- ; and (II) (Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Mn.sub..gamma. O.sub.3m+.delta.+1).sup.2- (III) (Bi.sub.2 O.sub.2).sup.2+ (A.sub.m-1 B.sub.m Zr.sub..beta. Mn.sub..gamma. O.sub.3m+.delta.+1).sup.2- (IV) wherein A consists essentially of at least one element selected from the group consisting of Na, K, Ca, Sr, Ba, Bi, and Pb, and B consists essentially of at least one element selected from the group consisting of Nb, Ta, and Ti, at least part of which is replaced with combinations of a wide variety of ions, and wherein m, .beta., .gamma., and .delta. are greater than 0.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully