PIEZOELECTRIC MATERIAL AND ITS PRODUCTION AND PIEZOELECTRIC OSCILLATOR AND PIEZOELECTRIC SOUNDING BODY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To stably obtain a piezoelectric material comprising a material composition having a composition of phase boundary between a good tetragonal system and a good rhombohedral system, in an oxide ferroelectric ceramic used for various kinds of electronic parts, and to use a particle diameter-controlling agent capable of sufficiently pulling out the performances of the piezoelectric material and simultaneously controlling the sizes of grains, in a piezoelectric sounding body requiring a highly strong and compact ceramic. SOLUTION: This piezoelectric material containing as a main component a perovskite type oxide containing iron is produced by calcining a material of the formula (Pb(1-x-α) Mα )(Zr(1-y) Tiy )(1-z) (Mg2/3 )z O3 [M is at least one element selected from Ba, Bi and Sr; 0<=(α)<0.10; 0.20<(y)<0.30; 0.45<(z)<0.55, adding MgNb2 O6 of columnbite type oxide as a grain diameter-controlling agent in an amount range: 0.005<(x)<0.05 based on Pb and again calcining the mixture.