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Growth and characterization of bismuth magnesium titanate Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)0$$_3$$

Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)0$$_3$$の合成と評価

米田 安宏  ; 齋藤 寛之; 吉井 賢資 ; 西田 貴司*; 早川 弘毅*; 池田 直*

Yoneda, Yasuhiro; Saito, Hiroyuki; Yoshii, Kenji; Nishida, Takashi*; Hayakawa, Hironori*; Ikeda, Naoshi*

高温高圧合成によってBi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$を作製した。常圧合成ではBi$$_2$$O$$_3$$, Ti$$_2$$O$$_3$$とMgOの混合粉体を固相反応法によって焼結してもペロブスカイト構造のサンプルは得られない。常圧合成では層状ビスマス化合物の方が安定だからである。高圧合成によって得られたBi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$は若干の不純物が存在するもののrhombohedral構造を示していた。不純物の影響でleakyなD-Eループしか得ることができなかったが、今後、純度が向上すれば非鉛圧電体の有力なエンドメンバーとなることが期待できる。

Polycrystalline Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ samples were prepared under high pressure. A mixed powder of Bi$$_2$$O$$_3$$, Ti$$_2$$O$$_3$$ and MgO with a prescribed ratio was packed into platinum cell and was heated a cubic anvil-type apparatus at 6.5 GPa and 1000 $$^circ$$C. The obtained samples were characterized by powder X-ray diffraction measurements. Although some impurity peaks existed, the main peaks were perovskite peaks. The structure of Bi(Mg$$_{1/2}$$Ti$$_{1/2}$$)O$$_3$$ is rhombohedral, as well as BiFeO$$_3$$. The D-E hysteresis loop was not saturated due to the impurities, but the possibility as ferroelectric can be expected enough.

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