Use of microgravity for investigating phase separation and crystallization in a heavy metal fluoride glass

Sudhanshu Varma; S. Eswar Prasad; Ian Murley; T. A. Wheat

doi:10.1117/12.56566

1 January 1992 Use of microgravity for investigating phase separation and crystallization in a heavy metal fluoride glass

Sudhanshu Varma, S. Eswar Prasad, Ian Murley, T. A. Wheat

Author Affiliations +

Proceedings Volume 1591, Infrared Fiber Optics III; (1992) https://doi.org/10.1117/12.56566
Event: OE Fiber, 1991, Boston, MA, United States

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.

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Sudhanshu Varma, S. Eswar Prasad, Ian Murley, and T. A. Wheat "Use of microgravity for investigating phase separation and crystallization in a heavy metal fluoride glass", Proc. SPIE 1591, Infrared Fiber Optics III, (1 January 1992); https://doi.org/10.1117/12.56566

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