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High pressure and temperature synthesis of Bi-based perovskite Bi$$_{0.5}$$Na$$_{0.5-x}$$Li$$_x$$)TiO$$_3$$

Liを含むビスマス系ペロブスカイトの高温高圧合成

福永 正則; 米田 安宏  ; 福山 諒太*; 齋藤 寛之; 池田 直*; 片山 芳則

Fukunaga, Masanori; Yoneda, Yasuhiro; Fukuyama, Ryota*; Saito, Hiroyuki; Ikeda, Naoshi*; Katayama, Yoshinori

ビスマスペロブスカイト(Bi$$_{0.5}$$Na$$_{0.5-x}$$Li$$_x$$)TiO$$_3$$の高圧合成を行った。固相反応により作製された単相のBNLTは$$x$$=0.1より小さい試料でペロブスカイト構造が観測された。固相反応は6$$sim$$10GPaの圧力範囲と800$$sim$$1200$$^{circ}$$Cの温度範囲で合成された。単相が得られたBNLT($$x$$=0.1)は、(Bi,Na)TiO$$_3$$と同様の二つの熱異常が観測された。210$$^{circ}$$Cに見られる熱異常はRohmbohedral-Tetragonalの構造相転移に起因するものと考えられる。$$x$$=0.2より大きい組成で得られた最終生成物は3種類の不純物を含んでおり、これらは出発物質の選択により影響を受ける。

High-pressure synthesis of bismuth based perovskite (Bi$$_{0.5}$$Na$$_{0.5-x}$$Li$$_x$$)TiO$$_3$$ (BNLT) ($$x$$=0.1, 0.15, 0.2, 0.25, 0.4, 0.5) was demonstrated. Single phase BNLTs with perovskite structure were successfully synthesized for $$x$$$$leq$$0.1 by the solid state reaction method. The solid phase reaction occurred in the pressure range of 6-10 GPa, and in the temperature range of 800-1200 $$^{circ}$$C. Two thermal anomalies were observed in single phase perovskite BNLT ($$x$$=0.1) as well as (Bi,Na)TiO$$_3$$. The cusp like anomaly at 210 $$^{circ}$$C was assigned to a rhombohedral-tetragonal structural phase transition. The finished products of $$x$$$$geq$$0.2 included three kinds of impurities, which were affected by the selection of starting materials.

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