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Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$のLiドープ効果

Substitution effect of Li in Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$

米田 安宏; 晝間 裕二*; 永田 肇*; 竹中 正*

Yoneda, Yasuhiro; Hiruma, Yuji*; Nagata, Hajime*; Takenaka, Tadashi*

Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$は圧電振動子としてPbTiO$$_3$$の代替材料として注目されている。圧電振動子としての利用上の問題点は脱分極温度(T$$_d$$)が低いことで、T$$_d$$を上げるために多くの試みがなされてきた。Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$への添加剤として唯一脱分極温度を上げることができたのがリチウムである。脱分極温度上昇の起源を突き止めるため、LiをドープしたBi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$の構造解析を行った。その結果、LiをドープしているにもかかわらずBi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$の構造からランダムネスが減少しており、オーダー構造が支配的となっていることがわかった。

Bi$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$ is paid to attention as an alternative material of PbTiO$$_3$$ for the use of an piezoelectric oscillator. In the problem in use as the piezoelectric vibrator, the depolarization temperature is a low. A lot of attempts to increase the depolarization temperature have been performed. Being able to raise the depolarization temperature as an additive only is a lithium. We performed the structure analysis to clarify the T$$_d$$ increasing mechanism on Li-doped i$$_{0.5}$$Na$$_{0.5}$$TiO$$_3$$. As a result, Randomness owing to the deference between the ionic size of Na and Bi decreases from the structure though Li is doping done, and it has been understood that the order structure is predominant.

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