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Local structure analysis of Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$, Bi$$_{0.5}$$Na$$_{0.4}$$Li$$_{0.1}$$TiO$$_3$$, and 0.95Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$ $$cdot$$ 0.05BaMn$$_{1/3}$$V$$_{2/3}$$O$$_3$$

Yoneda, Yasuhiro  ; Nagamoto, Takeru*; Nakai, Tomoaki*; Kobune, Masafumi*

Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$ (BNT) has been investigated as a lead-free piezoelectric material. We have already performed structure analysis of BNT. The average structure of BNT with low-temperature synthesis is a rhombohedral structure and it becomes a monoclinic structure as the synthesized temperature increases. Our local structure analysis indicated that the ${it A}$-site atoms of Bi and Na displaced toward different position depending on the lattice expansion and construction. We synthesized BNT crystals with various substitution and performed local structure analysis to examine the hypothesis. The local structure analysis revealed that the substitution effect on BNT can be explained by our hypothesis.



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