| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic material having electromechanical coupling coefficient and mechanical quality factor satisfying a level not less than a specific value and having high stability of piezoelectric characteristics to the change of a temperature. <P>SOLUTION: The piezoelectric ceramic material has a composition formula expressed by Pb<SB>x</SB>[(Co<SB>1/3</SB>Nb<SB>2/3-y</SB>)<SB>a</SB>(Sb<SB>1/2</SB>Nb<SB>1/2</SB>)<SB>b</SB>Ti<SB>c</SB>Zr<SB>d</SB>]O<SB>3</SB>+(e) wt.% R<SB>2</SB>O<SB>3</SB>(where, a+b+c+d=1 and R expresses a rare earth element) and the composition range is 0.92≤x≤1.00, 0<y≤0.03, 0.03≤a≤0.30, 0<b≤0.10, 0.40≤c≤0.53, 0.25≤d≤0.52, 0≤e≤1.50. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
