Abstract
Viscosity coefficients of molten ZnCl2-MCl (M=Cd, Pb, Sn, Ba) binary systems have been measured by means of the rotating cylinder method on the ZnCl2-rich side. The results obtained are summarized as follows:(1) Viscosity coefficient for each salt mixture decreases drastically with increasing MCl2 content and temperature. The temperature dependence of viscosity coefficients exhibits non-Arrhenius behavior in the composition range of 0-about 30 mol%MCl2 (0-about 10 mol%BaCl2 for the ZnCl2-BaCl2 system).(2) Apparent activation energies for viscous flow in these binary systems decrease markedly with increasing MCl2 content in the order of CdCl2<SnCl2<PbCl2<BaCl2 in the composition range up to about 25 mol%MCl2.(3) Isothermal viscosity coefficients and activation energies of the molten ZnCl2-SnCl2 system are larger than those of the molten ZnCl2-PbCl2 system in the composition range less than 25 mol%MCl2, but their magnitudes reverse in the composition range of more than 25 mol%MCl2.(4) The effect of each metallic cation on the destruction of molten ZnCl2 polymer is explained on the basis of simple Førland’s model.
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