Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Japan Institute of Metals and Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
