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Phase relations of AgI under high pressure and high temperature

高温高圧下でのAgIの相関系

大高 理*; 竹部 仁*; 吉朝 朗*; 福井 宏*; 片山 芳則

Otaka, Osamu*; Takebe, Hitoshi*; Yoshiasa, Akira*; Fukui, Hiroshi*; Katayama, Yoshinori

AgIの、$$alpha$$-AgI構造,岩塩構造,乱れた岩塩構造及び液体の間の相関系を調べるために、大容量高圧装置と放射光を用いたX線その場観察を、圧力6GPaまで、温度1000Kまでの高温高圧下で行った。$$alpha$$-AgI構造,不規則岩塩構造,液体の3つの相は823K,1.3GPaにある3重点で共存する。乱れた岩塩構造の融解曲線は直線で正の傾きを持つ。岩塩構造と乱れた岩塩構造の間の転移は、同じ構造の間での、幅の広いぼやけた無秩序化である。よって、乱れた岩塩構造の生成は(111)と(200)回折線の相対的な強度比の変化によって推定された。加圧にともない、岩塩構造はより高温でも安定となる。6.0GPaで岩塩構造は乱れた岩塩構造に転移することなく融解する。

Using a multi-anvil high-pressure device and synchrotron radiation, X-ray ${it in situ}$$$ observations of AgI high pressure and high temperature up to 6.0 GPa and 1000 K have been  performed to investigate the phase relations between $$$alpha$-AgI, rocksalt-type, disordered rocksalt-type, and liquid phases. The three phases of $$alpha$-AgI, disordered rocksalt-type, and liquid meet in a triple point in the vicinity of 823 K and 1.3 GPa. The melting curve of the disordered rocksalt phase is linear with a positive slope. The transition between rocksalt and the disordered rocksalt phases is a broad and diffuse disordering type within the same structure. The formation of the disordered rocksalt phase has been hence estimated with the variation of a relative intensity ratio of (111) and (200) diffraction from the rocksalt phase. With increasing pressure the rocksalt phase becomes stabel at high temperature. At 6.0 GPa the rocksalt phase directly melts without the transition to the disordered rocksalt phase.

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パーセンタイル:65.5

分野:Physics, Condensed Matter

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