Patent ID: 6278225
Filing Date: 2001-08-21
Classification: H01L

Abstract:
An ultrasonic wave motor comprsing a piezoelectric ceramic composition having a tetragonal perovskite structure comprising an A site and a B site, 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 occupy the A site, Zr, Ti, Sb and Mn occupy the B site, and a molar ratio of A site/B site atoms of (a+b/c+d+e+f) is more than 1.00 and less than or equal to 1.03,wherein the values of a-f are the ratios of respective atoms when c+d+e+f=1.