Using X-ray diffraction and differential scanning calorimetry (DSC), the structure and the crystallization mechanism of Se0.7Te0.3 chalcogenide glass have been studied. By means of the radial distribution function, the short-range order of the amorphous phase has been discussed. The lattice parameters of the crystalline phase have been determined by using the Cohen least-squares method. The crystallization mechanism and the activation energy have been investigated by using the Ozawa and the Takhor methods, respectively.

The calculated lattice parameters a and c of the crystalline phase are 0.4380 ± 0.0015 and 0.5198 ± 0.0027 nm, respectively. On the other hand, the results of the thermal analysis indicate that the crystallization process is a two-dimensional growth. The calculated value of the activation energy for crystal growth EG is 161.7 ± 0.6 kJ/mol.