The scope of this study is to determine the different crystal formation in the 0.8TeO(2) + 0.2CdF(2) glasses heated with different rates to various annealing temperatures by using differential thermal analysis (DTA), X-ray diffraction (XRD) techniques, chemical analysis, optical microscope and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS). Different number of exothermic peaks were observed indicating the different crystallization or the transition of certain phases in the glass structure as the heating rate of DTA scans varied from 5 to 20 degrees C/min. On the basis of the XRD investigations alpha-TeO(2), gamma-TeO(2) and CdTe(2)O(5) crystalline phases were determined. SEM/EDS investigations of all the glasses revealed the presence of different phases correlated with the XRD analysis. (C) 2008 Elsevier Ltd. All rights reserved.