Viscosity and Its Temperature Dependence in Molten BeF2
作者： Cornelius T. Moynihan , Stanley Cantor
DOI: 10.1063/1.1664455
关键词: Viscosity 、 Relative viscosity 、 Arrhenius equation 、 Reduced viscosity 、 Orders of magnitude (entropy) 、 Viscometer 、 Apparent viscosity 、 Temperature dependence of liquid viscosity 、 Chemistry 、 Thermodynamics
摘要: The viscosity of molten beryllium fluoride has been measured with coaxial‐cylinder viscometers over five orders magnitude (limits: 979°C, 28.6 P; 574°C, 2.24 × 106 P). Over the experimental range shear stresses, BeF2 behaves as a Newtonian fluid. Like SiO2, its high‐temperature analog, shows an Arrhenius temperature dependence several in viscosity. Reported heat‐capacity data for and SiO2 Adam‐Gibbs theory indicate that behavior these liquids may be explained terms configurational entropy which is virtually constant at temperatures above glass‐transition temperature.
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