Local structure analysis of high-quality BiNaTiO

Yoneda, Yasuhiro   ; Noguchi, Yuji*

Since bismuth sodium titanate (BiNaTiO, BNT) exhibits relatively large piezoelectric properties, many studies have been conducted as lead-free piezoelectric materials. Since it is a highly volatile substance containing bismuth and sodium, it was difficult to obtain a chemically correct BNT due to these defects generated during firing. Recent improvements in the synthetic method have made it possible to obtain BNT with a chemical composition, so structural analysis was performed again using high-quality BNT. As a result of local structural analysis, it was found that bismuth atoms shift from the average structural position in the high-temperature region, causing a structural phase transition. (to be published) The diffuse scattering component has a weaker intensity than the Bragg reflection, but we have devised a method to evaluate whether analysis level data is obtained, and we plan to report this as well.