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Proceedings Paper

Crystallization Of Heavy Metal Fluoride Glasses
Author(s): Narottam P. Bansal; Allan J. Bruce; R. H. Doremus; C. T. Moynihan
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Paper Abstract

The kinetics of crystallization of a number of fluorozirconate glasses were studied using isothermal and dynamic differential scanning calorimetry, and X-ray diffraction. The addition of the fluorides LiF, NaF, AiF3, LaF3 to a base glass composition of ZrF4-BaF2 reduced the tendency to crystallize, probably by modifying the viscosity-temperature relation. ZrF4-BaF2-LaF3-A2,F3-NaF glass was the most stable against devitrification and perhaps is the best composition for optical fibers with low scattering loss. Some glasses first crystallize out into metastable --BaZr2F10 and ,.---BaZrF6 phases, which transform into the most stable a-phases when heated to higher temperatures. The size of the crystallites was estimated to be (≈ 600 Å from X-ray diffraction.

Paper Details

Date Published: 16 October 1984
PDF: 10 pages
Proc. SPIE 0484, Infrared Optical Materials and Fibers III, (16 October 1984); doi: 10.1117/12.943142
Show Author Affiliations
Narottam P. Bansal, Rensselaer Polytechnic Institute (United States)
Allan J. Bruce, Rensselaer Polytechnic Institute (United States)
R. H. Doremus, Rensselaer Polytechnic Institute (United States)
C. T. Moynihan, Rensselaer Polytechnic Institute (United States)

Published in SPIE Proceedings Vol. 0484:
Infrared Optical Materials and Fibers III
Paul Klocek, Editor(s)

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