| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-lead metal-based piezoelectric porcelain having a high Curie temperature of >=150 deg.C and a piezoelectric strain constant (d33 ) in a practical use level of >=80 pC/N. SOLUTION: This piezoelectric porcelain consists mainly of crystal particles comprising a tungsten bronze type compound oxide expressed by the formula: Sr2 NaNb5 O15 in which a part of Nb is substituted by V and/or Ta. Therein, part of Sr is preferably replaced by at least one or more kinds of elements selected from Mg, Ca and Ba, and part of Na is desirably replaced by K. The piezoelectric porcelain is especially expressed by the atomic ratio composition formula: (Sr2-a Aa )x (Na1-b Kb )y (Nb5-c Vc )O15 [0.10<=(a)<=0.65; 0.20<=(b)<=0.80; 0<(c)<=0.10; 0.96<=(x)<=1.04; 0.80<=(y)<=1.20; A is at least one kind of Mg, Ca and Ba]. |
