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Local structure of NaNbO$$_3$$

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

NaNbO$$_3$$ which is one of the niobium system perovskite contains sodium of the alkaline metal at ${it A}$-site. Although composition was a difficult ferroelectric because of the deliquescence of an alkali metal oxide, this problem is also being conquered and a good sample came to be compounded in recent years. Then, in order to reconfirm the phase transition of NaNbO$$_3$$, the structural analysis using the two-body correlated distribution function method (PDF) which is one of the local order analyses was conducted. Usually, in the structure phase transition of a ferroelectric, local order hardly changes near the transition point. However, change of clear local order is seen in NaNbO$$_3$$, and a phase transition mechanism is under consideration.

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