| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic material having an increased mechanical quality factor Qm though it is a lead-free piezoelectric ceramic material and having characteristics suited for use, for example, in an ultrasonic transducer or the like. <P>SOLUTION: The piezoelectric ceramic material comprises elements of Bi, Na, Ti, Ba, Mn, Nb and O, and is expressed by general formula: (1-x-y)(Bi<SB>0.5</SB>Na<SB>0.5</SB>)TiO<SB>3</SB>-xBaTiO<SB>3</SB>-yBa(Mn<SB>1/3</SB>Nb<SB>2/3</SB>)O<SB>3</SB>, wherein x and y satisfy formula (1): 0.01≤x≤0.20 and formula (2): 0<y≤0.05. <P>COPYRIGHT: (C)2007,JPO&INPIT |
