Devitrification of TeO2-doped Fluoroaluminate Glass

Abstract

Abstract: Crystallization behavior of the glass system AlF3-MgF2-CaF2-SrF2-BaF2-YF3-TeO2 (AMCSBY-TeO2) was studied by the nonisothermal method using differential thermal analysis. The activation energy E and Avrami exponent $n$ were determined by nonisothermal method. It is found that the value of E varies with increasing TeO2 and reaches a minimum at 10~mol~fraction TeO2, while n decreases from 3.65 to 1.78 with the addition of TeO2. X-ray diffraction shows that Ba2Te3O8, MgTe2O5, and SrTeO3 phase formed when the glasses were reheated. The addition of TeO2 changes the crystallization mechanism and improves the stability of the fluoroaluminate glass.

Key words: Fluoroaluminate glass, TeO2, Crystallization

Bin TANG, Xinqiang YUAN, Tianfeng XUE, Jiacheng LI, Youyu FAN, Hefang HU. Devitrification of TeO2-doped Fluoroaluminate Glass[J]. J Mater Sci Technol, 2006, 22(04): 565-568.

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