Orientation control of Nb-based piezoelectric ceramics by rolling-extended method with platelike NaNbO₃ crystal particles

Abstract

Using platelike NaNbO₃ crystal particles prepared by single-step molten salt synthesis, the textured Nb-based piezoelectric ceramics were fabricated by the rolling-extended method. In the single-step molten salt synthesis, fine platelike NaNbO₃ crystal particles were obtained when the amount of Bi₂O₃ was decreased to one third of the stoichiometric amount for Bi_2.5Na_3.5Nb₅O₁₅. Textured NaNbO₃ ceramics were sintered from the green body containing these NaNbO₃ crystal particles as templates. The maximum orientation degree was about 94% when the template content was 10% in the green body.