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Local structure analysis of NaNbO$$_3$$

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

NaNbO$$_3$$ has an antiferroelectric structure at room temperature and finds important technological applications. It exhibits an unusual complex sequence of temperature- and pressure-driven structural phase transitions. NaNbO$$_3$$ shows unambiguous evidence for the presence of the ferroelectric $$R3c$$ phase coexisting with an antiferroelectric phase ($$Pbcm$$) over a wide range of temperatures. We have carried out atomic pair-distribution function (PDF) analysis on NaNbO$$_3$$ to understand the phase transitions. High-energy X-ray PDF using powder samples were carried out at the SPring-8, which is provided to become rhombohedral structure if ${it A}$-site atoms did order and to become antiferroelectric phase if ${it A}$-site atoms did disorder.

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