In the piezoelectric porcelain constituent which designates the bismuth stratified chemical compound which

摘要

PROBLEM TO BE SOLVED: To provide a composition of piezoelectric porcelain the main component of which is SrBi₂Nb₂O₉, which is useful as a material for a piezoelectric ceramic element or the like, in which Q_max can be improved without increasing the content of Bi over the stoichiometric composition, which contains no lead or lead compound or very little lead or lead compound and shows Q_max of a practical use level.;SOLUTION: In the composition of piezoelectric porcelain comprising as a main component a bismuth lamellar compound composed of Sr, Bi, Nb, oxygen and a trivalent metal element other than Bi, when the molar ratio of Sr, Bi, Nb and the trivalent metal element other than Bi is expressed as a:b:c:x, the expressions of 0.275a/c0.5; 0.9≤b/c≤1; 0x/c≤0.175; 0.5(a+3x/2)/c≤0.7 are satisfied.;COPYRIGHT: (C)2003,JPO