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Proceedings Paper

Use of microgravity for investigating phase separation and crystallization in a heavy metal fluoride glass
Author(s): Sudhanshu Varma; S. Eswar Prasad; Ian Murley; T. A. Wheat
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Paper Abstract

Experimental evidence for the effects of gravity on the crystallization of multiple phases in a Zr-Ba-La-Al-Na fluoride glass (ZBLAN) is presented. Thermal analysis (DTA) of ZBLAN bulk glass preforms showed the presence of two crystallization peaks under 1-g. Similarly, SEM analyses of thin filaments (drawn from these preforms and sealed in quartz ampules) heat treated in the range of 350 degree(s)C - 500 degree(s)C under 2-g for 20 seconds showed the crystallization of one/two phases. EDXA of these filaments indicated that the crystallized phases were either rich in Na and Al or deficient in Na and Al. On the other hand, filaments heat treated under 0-g did not show any evidence of crystallization.

Paper Details

Date Published: 1 January 1992
PDF: 12 pages
Proc. SPIE 1591, Infrared Fiber Optics III, (1 January 1992); doi: 10.1117/12.56566
Show Author Affiliations
Sudhanshu Varma, B.M. Hi-Tech Inc. (Canada)
S. Eswar Prasad, B.M. Hi-Tech Inc. (Canada)
Ian Murley, B.M. Hi-Tech Inc. (Canada)
T. A. Wheat, CANMET (Canada)

Published in SPIE Proceedings Vol. 1591:
Infrared Fiber Optics III
James A. Harrington; Abraham Katzir, Editor(s)

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