Piezoelectric ceramic compositions and methods for production thereof
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United States of America Patent
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Nov 27, 2001
Grant Date -
N/A
app pub date -
Sep 21, 1999
filing date -
Sep 21, 1999
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Expired
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Abstract
Low loss piezoelectric ceramic compositions cofirable with silver at a reduced sintering temperature and methods for producing the such compositions are provided. The compositions are binary piezoelectric ceramic compositions having a first component which is characterized by about 95.0 to about 99.5 weight percent of a system represented by a general formula Pb(Zr.sub.x Ti.sub.1-x)O.sub.3 +y wt % MnO.sub.2 in which x and y represent weight percentages and wherein x is within a range from 0.0 to about 1.0, and y is within a range from about 0.1 to about 1.0. The compositions also have 0.5 to 5.0 wt % of a second component represented by the general formula w wt % Bi.sub.2 O.sub.3 -z wt % CdO in which w and z represent weight percentages and wherein w is within a range from about 0.1 to about 1.0, and z is within a range from about 0.1 to about 2.0. The piezoelectric ceramic compositions are non-reactive with a silver electrode layer when cofired therewith at sintering temperatures of about 900.degree. C. and may be employed to produce piezoelectric transformers having a voltage breakdown of about 50 kv/cm or more.
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