Non-isothermal crystallization kinetics of ternary Se90Te10-xPbx glasses

Ternary Se90Te10-xPbx with (x=2 and 6 at%) glass compositions have been prepared using a melt quenching technique and performed the non-isothermal kinetics by differential thermal analysis (DTA) at various heating rates. The glassy state of the studied samples has been characterized using x-ray diffraction analysis. The glass transition temperature T-g, the onset temperature of crystallization T-c, and the peak temperature of crystallization T-p are found to be composition and heating rate dependent. From heating rate dependence of T-g and T-p, the glass transition activation energies E-g and the crystallization activation energies E-c have been determined according to different methods. The transformation mechanisms have been examined by the values of Avrami exponent n and dimensionality of growth m. Thermal stability and glass formation ability have been monitored through the calculation of the thermal stability S, temperature difference Delta T, Hurby parameter H-r, frequency factor K-o, crystallization rate factor K and fragility index F. The compositional dependence of the above-mentioned parameters indicate that, the stability of the studied glass samples decreases with increasing Pb at% content. (C) 2015 Elsevier B.V. All rights reserved.