Crystallization And Viscosity Of Heavy Metal Fluoride Glasses

C. T. Moynihan; R. Mossadegh; P. K. Gupta; M. G. Drexhage

doi:10.1117/12.961113

12 May 1986 Crystallization And Viscosity Of Heavy Metal Fluoride Glasses

C. T. Moynihan, R. Mossadegh, P. K. Gupta, M. G. Drexhage

Proceedings Volume 0618, Infrared Optical Materials and Fibers IV; (1986) https://doi.org/10.1117/12.961113
Event: O-E/LASE'86 Symposium, 1986, Los Angeles, CA, United States

Abstract

Shear viscosity data for a glassforming ZrF₄-BaF₂-LaF₃-A1F₃ composition covering the range from the highly fluid melt down to the glass transition (10^-1 to 10¹³ P) have been collected from five sources. The viscosity temperature dependence is highly non-Arrhenius and cannot be described by three parameter expressions such as the Fulcher equation. The four parameter Cohen-Grest equation, however, does give a good fit to the data, possibly allowing interpolation in the range of intermediate viscosity important for fiber drawing where data is currently lacking. The viscosity data are compared with crystallization temperatures obtained by DSC during heating and cooling at 10K/min.

Citation Download Citation

C. T. Moynihan, R. Mossadegh, P. K. Gupta, and M. G. Drexhage "Crystallization And Viscosity Of Heavy Metal Fluoride Glasses", Proc. SPIE 0618, Infrared Optical Materials and Fibers IV, (12 May 1986); https://doi.org/10.1117/12.961113

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