Glass transition kinetics and crystallization mechanism in Ge–Ga–S–CsCl chalcohalide glasses

• Published in: Journal of non-crystalline solids 2014-09, Vol.398-399, p.42-47
• Main Authors: Xu, Weina, Ren, Jing, Chen, Guorong
• Format: Article
• Language: English
• Subjects: Activation energy; Approximation; Chalcohalide glasses; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystallization; Crystallization kinetics; Differential scanning calorimeter (DSC); Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass; Glass transition; Glass transition temperature; Glass transitions; Growth from solid phases (including multiphase diffusion and recrystallization); Materials science; Mathematical analysis; Methods of crystal growth; physics of crystal growth; Phases; Physics; Solid-solid transitions; Specific phase transitions; Treatment of materials and its effects on microstructure and properties
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2014.04.023

The glass transition and the crystallization kinetics of 70Ge2S–10Ga2S3–20CsCl and 37.5Ge2S–22.5Ga2S3–40CsCl chalcohalide glasses were studied by using a differential scanning calorimeter (DSC) under non-isothermal conditions and X-ray diffraction (XRD) techniques. Two crystalline phases (Ga2S3 and Ge2S) were identified after annealing the chalcohalide glasses at the temperature corresponding to the crystallization peaks for 2h. All the characteristic temperatures such as glass transition (Tg), crystallization onset (Tc) and crystallization peak (Tp) temperatures were found to depend on both the heating rate and the composition. Two approaches, namely Moynihan and Kissinger, were used to calculate the relaxation activation energy (Et). In addition, characteristic activation energies (Ec) and Avrami exponents (n) were obtained and analyzed by using Kissinger's relation, Ozawa's method, the Augis–Bennett approximation and the Matusita–Sakka theory. •Glass transition and crystallization kinetics of chalcohalide glasses were studied by DSC.•Two crystalline phases (Ga2S3 and Ge2S) were identified after annealing.•Ga2S3 crystals grow in two dimensions in the studied glasses.