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${it In situ}$ identification of the metastable phase during solidification from the undercooled YFeO$$_{3}$$ melt by fast X-ray diffractometry at 250 Hz

250Hzの高速X線回折法による過冷却YFeO$$_{3}$$融体の凝固中に現れる準安定相のその場同定

長汐 晃輔*; 栗林 一彦*; Vijaya Kumar, M. S.*; 庭田 健司*; 日比谷 孟俊*; 水野 章敏*; 渡辺 匡人*; 片山 芳則

Nagashio, Kosuke*; Kuribayashi, Kazuhiko*; Vijaya Kumar, M. S.*; Niwata, Kenji*; Hibiya, Taketoshi*; Mizuno, Akitoshi*; Watanabe, Masahito*; Katayama, Yoshinori

ReFeO$$_{3}$$(Re=YとLu)が無容器で凝固する途中での準安定相をその場で同定するため、放射光源を用いた250Hzでの時分割X線回折(XRD)実験を行った。準安定相は、最初に過冷却状態のYFeO$$_{3}$$の融体から凝固し、最終的には短いリカレッセンスの間($$sim$$0.035s)に安定な斜方晶YFeO$$_{3}$$相へと相変態する。凝固後の試料の粉末X線回折では準安定相を検出できないが、今回測定に成功したYFeO$$_{3}$$の準安定相の回折パターンは、準安定六方晶LuFeO$$_{3}$$相と一致した。

A time-resolved X-ray diffraction (XRD) experiment at 250 Hz using a synchrotron radiation source was carried out during the containerless solidification of ReFeO$$_{3}$$ (Re=Y and Lu) in order to identify the metastable phase ${it in situ}$. The metastable phase solidified primarily from the undercooled YFeO$$_{3}$$ melt finally transformed to the stable orthorhombic YFeO$$_{3}$$ phase during the short period of recalescence ($$sim$$0.035 s). Although the metastable phase could not be detected in the as-solidified sample by the powder XRD, the successfully obtained diffraction pattern of the metastable phase in the YFeO$$_{3}$$ system was consistent with that of the metastable hexagonal LuFeO$$_{3}$$ phase.

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パーセンタイル:61.23

分野:Physics, Applied

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