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Local structure analysis of (Na,K,Li)NbO$$_3$$

Yoneda, Yasuhiro; Takada, Eri*; Nagai, Haruka*; Kikuchi, Takeyuki*; Kobune, Masafumi*

(Na,K)NbO$$_3$$ has been a candidate for lead-free piezo electric material, since it shows a novel piezoelectric properties by making a mixture between (Na,K)NbO$$_3$$ and LiNbO$$_3$$. (Na,K,Li)NbO$$_3$$ lies around a morphotropic phase boundary at room temperature, and it has been reported some co-existing phases of a tetragonal and a orthorhombic structures. We re-examined the crystal structure of (Na,K,Li)NbO$$_3$$ by using high-energy synchrotron X-ray. It was found that (Na,K,Li)NbO$$_3$$ has a monoclinic structure at room temperature. Moreover, we found a phase transition at approximately 200 K, in which the intensity of Bragg peaks changed drastically. The novel piezoelectric response of (Na,K,Li)NbO$$_3$$ is caused by modifying the phase transition below room temperature.

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