Development of new orientation control technique for Perovskite-type piezoelectric ceramics utilizing rolling-extended method

点击翻译按钮获取中文摘要

The effective orientation control technique for (K,Na)NbO3(KNN) system ceramics which are typical lead-free Perovskite type piezoelectric materials were established. This technique mainly consists of the rolling-extend method and the improved single-step molten salt method for preparing plate-like NaNbO3(NN) templates. NN templates, by which the highly textured ceramics are obtained, were synthesized in high-yield by optimizing mixture ratio of the starting materials. The textured KNN system ceramics with the orientation factor higher than 95% were fabricated by employing these NN templates and preheating technique. In addition, the spin-forming-extended method, which is the improved rolling-extended method, was developed for orientation control of tungsten-bronze-structured piezoelectric ceramics. By utilizing this technique, the large rectangular ceramics c-axis oriented in the thickness direction, are easily fabricated.