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Local structure of molten LaCl$$_3$$ by K-absorption edge XAFS

Okamoto, Yoshihiro  ; Shiwaku, Hideaki   ; Yaita, Tsuyoshi; Narita, Hirokazu; Tanida, Hajime*

The local structure of molten LaCl$$_3$$ was investigated by X-ray absorption fine structure(XAFS) of the La K-edge. The nearest La$$^{3+}$$-Cl$$^-$$ distance andcoordination number were 2.89$$pm0.01$$${AA}$ and 7.4$$pm0.5$$ from the curve fitting of the 1st peak in the fourier transform magnitude $$|FT|$$. The coordination number larger than 6 suggests that the local structure of molten LaCl$$_3$$ is not a simple octahedral coordination (LaCl$$_6$$)$$^{3-}$$, but 7-fold (LaCl$$_7$$)$$^{4-}$$ and/or 8-fold (LaCl$$_8$$)$$^{5-}$$ complexes. The 1st La$$^{3+}$$-La$$^{3+}$$ distance, of which correlation was observed as a weak 2nd peak in the $$|FT|$$, was evaluated to be 4.9${AA}$. It suggests that the distorted corner-sharing connection of the complex species is predominant in the melt, inontrast with molten YCl$$_3$$ in which the edge-sharing connection of the 6-fold (YCl$$_6$$)$$^{3-}$$ mainly exists.

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Category:Chemistry, Physical

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