Investigation on the kinetics of devitrification of GeS2-based glasses

Abstract

We studied the devitrification kinetics for the binary (80GeS2–20Ga2S3, mol%) and ternary (77GeS2–15Ga2S3–6CsI, mol%) glass compositions using the differential thermal analysis (DTA) technique. The overall activation energies for devitrification for these two types of glasses were determined by using the Kissinger method and the Johnson–Mehl–Avrami equation from the DTA data. The t-t-t curves were calculated using the activation energy for devitrification for each composition derived from the DTA experiments. The experimental evidences have shown that the incorporation of SnS2 and Sb2S3 in a ternary-based GeS2 glass slows down the overall devitrification rate significantly, which is confirmed by the reduction in the overall area under the crystallization exotherm.