The crystallization of Sb2S3 in the (GeS2)(0.2)(Sb2S3)(0.8) glass was studied under non-isothermal conditions. The influence of the sample form on crystallization was studied using bulk sample and two fractions of powder sample. The crystallization process of the sample in the form of powder was described using autocatalytic model, the crystallization of the bulk sample was described using nucleation-growth model. The parameters of both the models were determined. (c) 2005 Elsevier B.V. All rights reserved.