Non-isothermal crystallization kinetics of ternary Se 90 Te 10−x Pb x glasses

Abstract

© 2015 Elsevier B.V. Ternary Se90Te10-xPbxwith (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 Tg, the onset temperature of crystallization Tcand the peak temperature of crystallization Tpare found to be composition and heating rate dependent. From heating rate dependence of Tgand Tp, the glass transition activation energies Egand the crystallization activation energies Echave 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 ΔT, Hurby parameter Hr, frequency factor Ko, 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.