[20p-PB1-1~10] 9.1 Dielectrics, ferroelectrics

△ [20p-PB1-4] Ferroelectric characteristics, crystal and electronic structure of (K, Na)NbO₃-based ferroelectric ceramics by ball milling treatment and CuO doping

〇Yoshiaki Hirasawa¹, Naoya Ishida¹, Naoto Kitamura¹, Yasushi Idemoto¹ (1.Tokyo Univ. of Science)

Keywords:crystal structure

(K, Na)NbO₃ based ceramics is considered to be one of the most promising lead-free piezoelectric ceramics, but the problems such as volatilization of alkali metals. In this study, we investigated the effect of Cu addition and spark plasma sintering (SPS) method on the sinterability and the properties of KNN ceramics in which the ball milling time was changed. We discussed ferroelectric properties on the basis of crystal and electronic structure obtained by the Rietveld analysis using synchrotron X-ray diffraction date.