The structural characterizations of Se70Te30 chalcogenide glass for the as-prepared and thermal annealed samples are identified using the X-ray diffraction (XRD) and scanning electron microscopy (SEM). The isothermal thermal annealing process results in a transformation from the amorphous to the crystalline state. The average crystallite size increases from 8.67 to 11.24 nm when the temperature annealing increases from 95 to 118 degrees C. The thermal analyses of Se70Te30 glass are investigated using a differential thermal analyzer (DTA) at five different heating rates under non-isothermal conditions. The activation energy of the glass forming (E-g) as a parameter for the glass transition is estimated by employing different approaches proposed for thermal analyses. The study of crystallization kinetics includes the estimation of the activation energy of crystallization (Er), frequency factor (K-0) and Avrami exponent (n). (C) 2013 Elsevier B.V. All rights reserved.