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Nanoscale structural analysis of Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$ in high-temperature phases

Yoneda, Yasuhiro  ; Noguchi, Yuji*

Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$ (abbreviated as BNT) is a lead-free material but exhibits relatively large piezoelectric properties, a lot of researches have been conducted. We performed local structural analysis using high-quality BNT with a stoichiometrically correct composition, and found a chemical order structure of Bi/Na in locally. BNT undergoes a phase transition to a cubic phase at 400$$^{circ}$$C. We estimated that a new disorder structure will appear in the high-temperature phase. In the high temperature phase, pair distribution function (PDF) analysis using synchrotron radiation high-energy X-rays was performed. As a result, we found that Bi shifts from 200$$^{circ}$$C, and this shift becomes an order parameter for the phase transition.



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Category:Physics, Applied



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