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※ 半角英数字
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Piezoelectric properties and local structure analysis of (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ solid solutions by malic acid complex solution method

錯体重合法で作製した(Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$の圧電物性と局所構造

中井 友晃*; 小舟 正文*; 永本 健留*; 菊池 丈幸*; 米田 安宏

Nakai, Tomoaki*; Kobune, Masafumi*; Nagamoto, Takeru*; Kikuchi, Takeyuki*; Yoneda, Yasuhiro

非鉛圧電体としての応用が期待されているNaNbO$$_3$$とKNbO$$_3$$の固溶体は、焼結温度の違いから通常の固相反応法による合成が困難である。そこで、錯体重合法による合成法を開発し、固相反応法では得られないような緻密な焼結体を得ることができた。放射光を用いた構造解析を行ったところ、NaNbO$$_3$$とKNbO$$_3$$の相境界に加えて焼結助剤として加えたLiNbO$$_3$$も構造変化を誘起することがわかった。

Solid solutions of NaNbO$$_3$$ and KNbO$$_3$$ are the candidate for non-Pb piezoelectric materials. It is difficult to obtain dense ceramics owing to the difference of their calcination temperature. We developed the malic acid complex method to obtain the (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ to obtain a high-quality ceramics sample. It was found that (Na$$_{0.5}$$K$$_{0.45}$$Li$$_{0.05}$$)NbO$$_3$$ lies complicated phase boundaries; one is the structural phase boundary between NaNbO$$_3$$ and KNbO$$_3$$, the other is that between (Na,K)NbO$$_3$$ mixture and LiNbO$$_3$$, which is a sintering additive.

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