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(Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ - Ca(Zr$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$の高エネルギーX線回折

High-energy X-ray diffraction study of (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ - Ca(Zr$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$

米田 安宏   ; 宅和 千隼*; 小舟 正文*

Yoneda, Yasuhiro; Takuwa, Chihaya*; Kobune, Masafumi*

高エネルギーX線回折実験から得られる2体相関分布関数をニオブ系酸化物強誘電体に適用した。優れた圧電特性を持つ(Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ - Ca(Zr$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$は、わずかな添加物によって平均構造が変化する。平均構造の変化に伴う局所構造の変化の有無を調べるためにサンプルの密度やグレインサイズを一致させて測定したところ、3${AA}$から10${AA}$近辺の局所構造にほとんど差異はなかった。違いはナノスケールオーダー領域でコヒーレンスの違いが大きく、強誘電的ドメインサイズの違いが示唆された。

A two-body correlation distribution function obtained from high-energy X-ray diffraction experiments was applied to a niobium-based oxide ferroelectric (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ - Ca(Zr$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$ with excellent piezoelectric properties. The average structure of (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ - Ca(Zr$$_{0.5}$$Ti$$_{0.5}$$)O$$_3$$ changes with a small amount of Ta-additives. When the density and grain size of the sample were matched to determine whether the local structure changed with the change in the average structure, there was almost no difference in the local structure between 3${AA}$ and 10${AA}$. The difference was observed in the coherence of the nanoscale region, suggesting a difference in the ferroelectric domain size.

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