Piezoelectric Ceramic Composition
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United States of America Patent
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Issued Date -
Nov 6, 2008
app pub date -
Feb 22, 2006
filing date -
Mar 1, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a piezoelectric ceramic composition, for producing piezoelectric elements exhibiting high piezoelectric strain constant d.sub.33 and high Curie temperature Tc, which composition includes a perovskite PbZrO.sub.3 (a), a perovskite PbTiO.sub.3 (b), SrO (c), Nb.sub.2O.sub.5 (d) and ZnO (e), and relative amounts of the components (a), (b), (c) (d) and (e) satisfy the general formula: Pb(Zr.sub.aTi.sub.1-a)O.sub.3+bSrO+cNbO.sub.2.5+dZnO wherein 0.51.ltoreq.a.ltoreq.0.54; 1.1.times.10.sup.-2.ltoreq.b.ltoreq.6.0.times.10.sup.-2; 0.9.times.10.sup.-2.ltoreq.c.ltoreq.4.25.times.10.sup.-2; 0.1.times.10.sup.-2.ltoreq.d.ltoreq.1.25.times.10.sup.-2; and 2.9.ltoreq.c/d.ltoreq.15.0.
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