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Local structure analysis of KNbO$$_3$$ by high-energy X-ray diffraction

Yoneda, Yasuhiro   ; Ohara, Koji*; Nagata, Hajime*

KNbO$$_3$$ has been a candidate for the end member of a non-Pb ferroelectric materials. We performed local structure analysis of KNbO$$_3$$ bulk ceramics by high-energy synchrotron X-ray measurements. It has recently established that temperature-driven structural phase transitions in several perovskite ferroelectric materials (PbTiO$$_3$$, BaTiO$$_3$$, and NaNbO$$_3$$) believed to be purely displacive, have a significant order-disorder component. We performed the local structure analysis in a wide-temperature range to observe order-disorder feature of KNbO$$_3$$. The lowest temperature structure of KNbO$$_3$$ is rhombohedral, and we found that the local rhombohedral distortion maintained in the high-temperature cubic phase.

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