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フッ化テルビウム混合塩の構造解析

Structural analysis of molten TbF$$_3$$-LiF

沼倉 正彦*; Bessada, C.*; Ory, S.*; Rakhamatullin, A.*; 赤塚 洋*; 根津 篤*; 矢板 毅; 岡本 芳浩  ; 塩飽 秀啓   ; 松浦 治明*

Numakura, Masahiko*; Bessada, C.*; Ory, S.*; Rakhamatullin, A.*; Akatsuka, Hiroshi*; Nezu, Atsushi*; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Shiwaku, Hideaki; Matsuura, Haruaki*

溶融TbF$$_3$$-LiF混合体の局所構造を調べるために、高温XAFS実験をSPring-8のBL11XUビームラインで実施した。X線回折とDSC分析の結果、1073K以上ではTbF$$_3$$とBNが反応することがわかっていたので、それ以下の温度でヘリウム雰囲気下で、混合系を対象に測定を実施した。解析の結果、溶融TbF$$_3$$-LiF混合体中のTb$$^{3+}$$-F$$^-$$間距離は、固体の値よりも若干短くなり2.26${AA}$となることがわかった。

To investigate the local structure of molten TbF$$_3$$ - LiF (x[TbF$$_3$$ = 0.2), X-ray absorption fine structure technique (XAFS) was applied using by BL11XU in SPring-8. By several analyses, e.g. X-ray diffraction and differential scanning calorimetry, it had been confirmed that TbF$$_{3}$$ and boron nitride reacted at less than 1073 K even under helium gas flow environment, thus, we focused on the spectrum obtained below 1073 K. According to the curve fitting, the interionic distance obtained from the data of heating between 933 K and 1013 K was shorter than solid state. It would be surely molten state of TbF$$_3$$ - LiF (x[TbF$$_3$$] = 0.2), since the value of distance obtained, i.e. 2.26${AA}$ corresponds to the sum of ionic radii of Tb$$^{3+}$$ and F$$^-$$.

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