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For decades that the piezoelectric materials play important roles in various applications. Nowadays, it is of importance that we should avoid the materials which are environmentally toxic. We propose the barium zirconium titanate (BaZrxTi1-xO3 or BZT) ceramics which are the solid solutions of barium titanate and barium zirconate. This material has a phase diagram containing compositions or the Zr:Ti...