PIEZOELECTRIC CERAMIC COMPOSITION, PROCESS FOR PRODUCING SAID PIEZOELECTRIC CERAMIC COMPOSITION, AND PIEZOELECTRIC CERAMIC ELECTRONIC COMPONENT

摘要

This invention provides a piezoelectric ceramic composition comprising a main component represented by general formula {(1-x)(K_1-a-bNa_aLi_b)_m(Nb_1-c-dTa_cSb_d)O₃-xM1_nM2O₃}, wherein M1 represents Ca, Sr or Ba, M2 represents Ti, Zr or Sn, and 0.005 = x = 0.1, 0 = a = 0.9, 0 = b = 0.3, 0 = a + b = 0.9, 0 = c = 0.5, 0 = d = 0.1, 0.9 = m = 1.1, and 0.9 = n = 1.1, and 0.1 to 10 moles (preferably 1.5 to 10 moles) in total, based on 100 moles of the main component, of at least one specific element selected from In, Sc, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu. Preferably, Mn, Ni, Fe, Zn, Cu, or Mg is further added. According to this constitution, in both very small electric field and high electric field, a high piezoelectric d constant can be stably provided with high efficiency.