Piezoelectric ceramic composition and piezoelectric ceramic

Abstract

A piezoelectric ceramic composition including potassium-sodium-lithium niobate, bismuth-sodium titanate and bismuth ferrate is provided. A piezoelectric ceramic obtained by firing the piezoelectric ceramic composition, wherein the electromechanical coupling factor is high, the piezoelectric g33 constant, in particular, is large, the second phase transformation does not exist in the temperature range of −40 to 150° C. in at least one of a temperature-dependent variation of a resonance frequency, a temperature-dependent variation of an anti-resonance frequency and a temperature-dependent variation of piezoelectric g33 constant, and a good heat-resistant property is obtained, is provided.

Dependencies are inferred from the claim text.