[18p-Z16-1~16] 9.1 Dielectrics, ferroelectrics

[18p-Z16-16] Composition dependence of ferroelectric properties and crystal structure of (K,Na)NbO₃ based ferroelectrics, and other elements substitution effect

〇(M1)Kazuto Obata¹, Naoya Ishida¹, Naoto Kitamura¹, Yasushi Idemoto¹ (1.Tokyo Univ. of Science)

Keywords:Crystal structure, Ferroelectric material

Lead zirconate titanate (PZT) is widely used as a ferroelectric material in electronic devices. From the viewpoint of environmental load reduction, however, we paid attention to K_0.5Na_0.5NbO₃(KNN) with good piezoelectric characteristics among non-lead materials.
In this study, spark plasma sintering (SPS) was used to improve the sinterability.
Especially, we focused on KNN with 5 mol% Li substitution, and investigated effects of a change of the K and Na ratio and substitutions of Cu and Zn on the ferroelectric properties.
Furthermore, the effect of Cu and Zn on the electrical properties was investigated by crystal structure analysis using synchrotron X-ray and neutron diffractions.