Piezoelectric ceramic composition for use in an ultrasonic wave motor
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United States of America Patent
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Aug 21, 2001
Issued Date -
N/A
app pub date -
Jul 27, 2000
filing date -
Nov 18, 1997
priority date (Note) -
Expired
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Abstract
A piezoelectric ceramic composition, having a tetragonal perovskite structure and represented by a general formula Pb.sub.a Sr.sub.b (Zr.sub.c Ti.sub.d Sb.sub.e Mn.sub.f)O.sub.3 wherein Pb and Sr are assumed to occupy A site, Zr, Ti, Sb and Mn are assumed to occupy B site, and a molar ratio of A site/B site atoms of (a+b)/(c+d+e+f) is more than 1.00 to 1.03, preferably 0.01 to 0.03.
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