回転振動法による溶融ZnCl2-MCl(M=Li, Na, K, Cs)2成分系の粘性測定

江島 辰彦, 横尾 俊信, 斎藤 元治, 加藤 吉明

doi:10.2320/jinstmet1952.43.10_929

Viscosity coefficients of the molten ZnCl₂-MCl (M=Li, Na, K, Cs) binary systems have been measured in the composition range of 50∼100 mol%MCl at temperatures of 610 to 1240 K. In order to calculate the viscosity coefficient with the measured logarithmic decrement and oscillating period by the absolute method, Roscoe’s equation derived for a cylinder vessel having a free liquid surface has been used in the present work. The results obtained are summarized as follows: (1) The composition dependence of the viscosity coefficients and activation energies for viscous flow are determined for the whole range of composition on the basis of the data obtained in the present and previous works. Both the viscosity coefficient and the activation energy decrease with increasing MCl content. However, the ZnCl₂-KCl and -CsCl systems exhibit maxima near the stoichiometric composition of M₂ZnCl₄(66 mol%MCl). This trend clearly indicates that the donor effects of Cl⁻ ion of KCl and CsCl for the formation of ZnCl₄²⁻ are stronger than those of LiCl and NaCl. (2) There is a linear relationship between the fluidity and the molar volume in the composition range of more than 50 mol%MCl. But, this relationship fails on the ZnCl₂-rich side especially in the vicinity of the melting point. Deviations from the linearity increase as the content of ZnCl₂ increases. These facts suggest a remarkable structural change in the liquid of ZnCl₂-rich side. (3) Based on the results obtained, chemical species in these melts are estimated.

回転振動法による溶融ZnCl<SUB>2</SUB>-MCl(M=Li, Na, K, Cs)2成分系の粘性測定

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