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Local structure analysis of NaNbO$$_3$$, 2

Yoneda, Yasuhiro  ; Kohara, Shinji*; Fu, D.*

In the last meeting, we reported the result of the local structure analysis for NaNbO$$_3$$ using the atomic pair-distribution function method (PDF). Although NaNbO$$_3$$ is believed that rhombohedral structure and orthorhombic structure exit together in the wide temperature range below room temperature. Since local structure was reproduced by calculation, assuming rhombohedral structure in all the temperature ranges, it is considered that ground state of NaNbO$$_3$$ is rhombohedral structure. It is known that the diffuse phase transition accompanied by these 2 phase coexistence replaces to a sharp phase transition when Na of A-site is substituted by Li. In this time, the local structure analysis of (Na$$_{0.9}$$Li$$_{0.1}$$) NbO$$_3$$ was performed in the previous manner. In the 2-phase coexistence phase, it was found that Bragg reflections became sharp by doping Li and rhombohedral structure was stabilized locally.

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