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(Bi$$_{1/2}$$K$$_{1/2}$$)TiO$$_3$$-(Bi$$_{1/2}$$Li$$_{1/2}$$)TiO$$_3$$系固溶体におけるフェリ誘電性の発現

Ferri-electricity in (Bi$$_{1/2}$$K$$_{1/2}$$)TiO$$_3$$-(Bi$$_{1/2}$$Li$$_{1/2}$$)TiO$$_3$$ solid solution

斎藤 光太郎*; 米田 安宏   ; 松尾 拓紀*; 野口 祐二*

Saito, Kotaro*; Yoneda, Yasuhiro; Matsuo, Hiroki*; Noguchi, Yuji*

フェリ誘電相では優れた圧電性や誘電性に加え、電場誘起相転移に由来する巨大な電場誘起歪みが観測されている。(Bi$$_{1/2}$$K$$_{1/2}$$)TiO$$_3$$-(Bi$$_{1/2}$$Li$$_{1/2}$$)TiO$$_3$$ (BKT-BLT)固溶体セラミックスを対象に、結晶構造解析による組成相境界の探索と分極特性の組成依存性の評価を行い、フェリ誘電相の有無とその物性について調査した。本研究により、BKT-BLT固溶体系において、${it x}$=8%近傍にフェリ誘電相が存在すること、この組成おいて特異的に高い比誘電率が得られることが明らかになった。

In addition to excellent piezoelectricity and dielectric properties, ferri-dielectric phases exhibit giant electric-field-induced strain due to the electric-field-induced phase transition. The presence of ferri-dielectric phase and its properties were investigated for (Bi$$_{1/2}$$K$$_{1/2}$$)TiO$$_3$$-(Bi$$_{1/2}$$Li$$_{1/2}$$)TiO$$_3$$ (BKT-BLT) solid solution ceramics by searching for compositional phase boundaries and evaluating the composition dependence of polarization properties through crystal structure analysis. This study revealed that a ferri-dielectric phase exists around $$x$$ = 8% in the BKT-BLT solid solution system, and that a specifically high relative permittivity can be obtained at this composition.

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