PIEZOELECTRIC CERAMIC COMPOSITION FOR SURFACE ACOUSTIC WAVE DEVICE AND SURFACE ACOUSTIC WAVE DEVICE

摘要

PURPOSE: Provided are a piezoelectric ceramic composition for a surface acoustic wave device which can achieve a high impedance ratio even in high frequency regions, and a surface acoustic wave device. CONSTITUTION: The piezoelectric ceramic composition for a surface acoustic wave device is represented by the formula AaZrxTiy(NimMnnNb2/3)zO3, wherein: x+y+z=1; 0.93 <= a <= 1.02; 0.32 <= x <= 0.50; 0.41 <= y <= 0.54; 0.03 <= z <= 0.21; 0.24 <= m+n <= 0.67; and wherein A is Pb or the combination of Pb and at least one member of the group consisting of Ba, Ca and Sr. A piezoelectric ceramic comprises the sintered piezoelectric ceramic composition for a surface acoustic wave device. The surface acoustic wave device(1) comprises a piezoelectric substrate(2) comprising the piezoelectric ceramic and an interdigital transducer on the piezoelectric substrate.