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The invention relates to piezoelectric ceramic materials consisting of lead zirconate titanate and (1) at least one of an alkaline earth pyrochlore and an alkali metal perovskite having the formula ABO3, where B is Nb, Ta, or Sb; or (2) an alkaline earth alkali metal perovskite having the formula A(T0.25B0.75)O3, where A is the alkaline earth metal, T is the alkali metal, and B is Nb, Ta, or Sb. The materials are characterized by excellent heat and time stability.