Artigo
Effects of the particle size and nucleation temperature on tellurite 20Li(2)O-80TeO(2) glass crystallization
Fecha
2006-10-25Registro en:
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing. Lausanne: Elsevier B.V. Sa, v. 434, n. 1-2, p. 13-18, 2006.
0921-5093
10.1016/j.msea.2006.07.046
WOS:000240896400003
6725982228402054
8507741729691974
9800039813867116
5319785014016475
Autor
Universidade Estadual Paulista (Unesp)
Resumen
20Li(2)O-80TeMO(2) glasses were heat annealed at different temperatures between T-g and T-x and studied by using XRD, FTIR spectroscopy and DSC techniques to understand the crystallization kinetics in this glass matrix. The infrared band structure of this glass is similar to what was observed in glassy TeO2. XRD results reveal the presence of three distinct crystalline gamma-TeO2, alpha-TeO2 and Li2Te2O5 phases during the crystallization process. This is a first report of gamma-TeO2 phase crystallization in this glass matrix. DSC results confinn the crystallization of three distinct structures in the glass. In summary, our results suggest a crystallization hierarchy on this glass matrix since the gamma-TeO2 and alpha-TeO2 phases crystallization occurs before the Li2Te2O5 phase crystallization. (c) 2006 Elsevier B.V. All rights reserved.