The glass transition behavior and crystallization kinetics of Cu-0.3(SSe20)(0.7) chalcogenide glass were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD). Two crystalline phases (SSe20 and Cu2Se) were identified after annealing the glass at 773 K for 24 h. The activation energy of the glass transition (E-g), the activation energy of crystallization (E-c), the Avrami exponent (n) and the dimensionality of growth (m) were determined. Results indicate that this glass crystallizes by a two-stage bulk crystallization process upon heating. The first transformation, in which SSe20 precipitates from the amorphous matrix with a three-dimensional crystal growth. The second transformation, in which the residual amorphous phase transforms into Cu2Se compound with a two-dimensional crystal growth. (C) 2005 Elsevier B.V. All rights reserved.