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

摘要

A piezoelectric ceramic composition according to the present invention includes a primary component represented by the general formula of {(1-x)(K 1-a-b Na a Li b ) m (Nb 1-c-d Ta c Sb d )O 3 -xM1 n M2O 3 } (where M1 is Ca, Sr, or Ba, and M2 is Ti, Zr, or Sn), in which x, a, b, c, d, m, and n are set so as to satisfy 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 of at least one specific element selected from the group consisting of In, Sc, Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu is contained with respect to 100 moles of the primary component. Preferably, Mn, ni, Fe, Zn, Cu, or Mg is further added. As a result, at both a very low and a high electric field, a high piezoelectric d constant can be stably obtained with a high efficiency.