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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

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

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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