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Proceedings Paper

Critical problem of cadmium fluorochloride glass fiber drawing
Author(s): Guoyin Zhang; Jia Jiang; Marcel Poulain; Jose Renato Delben; Angela A.S. Delben
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Paper Abstract

Cadmium fluorochloride glass (CdFCl) is considered as a more favorable host for Pr3+ 1G4-3H5 transition than all-fluoride hosts, but it cannot be drawn easily into fibers. This critical problem is largely correlated with its special devitrification behavior and temperature dependence of viscosity. The high Avrami coefficients of crystallization obtained by isothermal method and by non-isothermal method suggest that nucleation rate increases during the crystallization. Meanwhile Avrami coefficients and activation energy values vary with the crystalline fraction. This corresponds to the formation of different phases during crystallization. The the ram XRD measurements performed from 210 to 320 degrees C confirm that chlorine-rich phases appear first at low temperature while the fluoride phases form lately. Comparison with fluorozirconate glass shows that CdFCl glass has a lower log (eta) - T slope. As a result the drawing temperature of the CdFCl glass is well above Tg, in the crystallization thermal range. These two factors explain the difficulties encountered in drawling CdFCl fibers from a preform. Drawing fibers directly from the melt should be an alternative method for CdFCl glasses.

Paper Details

Date Published: 28 September 1998
PDF: 8 pages
Proc. SPIE 3416, Infrared Glass Optical Fibers and Their Applications, (28 September 1998);
Show Author Affiliations
Guoyin Zhang, Univ. de Rennes I and Univ. Federal de Mato Grosso do Sul (Brazil)
Jia Jiang, Univ. de Rennes I and Univ. Federal de Mato Grosso do Sul (Brazil)
Marcel Poulain, Univ. de Rennes I (France)
Jose Renato Delben, Univ. Federal de Mato Grosso do Sul (Brazil)
Angela A.S. Delben, Univ. Federal de Mato Grosso do Sul (Brazil)

Published in SPIE Proceedings Vol. 3416:
Infrared Glass Optical Fibers and Their Applications
Mohammed Saad, Editor(s)

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