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Report No.

Molecular to ionic transition of BiCl$$_3$$ in LiCl-KCl eutectic melt

Okamoto, Yoshihiro  ; Yaita, Tsuyoshi; Minato, Kazuo 

The local structures of molten BiCl$$_3$$ and its mixtures in LiCl-KCl eutectic melt were investigated by X-ray absorption fine structure (XAFS) technique. The 1st Bi-Cl correlation in molten pure BiCl$$_3$$ shows covalent nature, since the distance was almost the same as sum of covalent radii of Bi and Cl and the coordination number was almost 3. The similar property was observed also in the mixture of 75% BiCl$$_3$$ with LiCl-KCl eutectic melt. Drastic change was detected in 25% BiCl$$_3$$ mixture melt. The 1st Bi-Cl distance was sum of ionic radii in molten 25% BiCl$$_3$$ melt. The results suggest that BiCl$$_3$$ changes from molecular liquid to ionic by mixing with alkali chlorides.



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Category:Chemistry, Physical



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