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Proceedings Paper

Crystallization And Viscosity Of Heavy Metal Fluoride Glasses
Author(s): C. T. Moynihan; R. Mossadegh; P. K. Gupta; M. G. Drexhage
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Paper 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.

Paper Details

Date Published: 12 May 1986
PDF: 6 pages
Proc. SPIE 0618, Infrared Optical Materials and Fibers IV, (12 May 1986); doi: 10.1117/12.961113
Show Author Affiliations
C. T. Moynihan, Rensselaer Polytechnic Institute (United States)
R. Mossadegh, Rensselaer Polytechnic Institute (United States)
P. K. Gupta, Owens/Corning Fiberglass (United States)
M. G. Drexhage, Rome Air Development Center (United States)

Published in SPIE Proceedings Vol. 0618:
Infrared Optical Materials and Fibers IV
Paul Klocek, Editor(s)

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