Thermal Properties of Se<sub>100–x</sub>Zn<sub>x</sub> Glassy System

Abstract

The crystallization process in Se 100-x Zn x glassy system is investigated using differential scanning calorimeters (DSC). The samples are prepared by conventional melt-quenching technique in the composition range 2 ≤ x ≤ 20 (at%). Nonisothermal measurements are carried out for different heating rates .The value of the glass transition temperature T g the crystallization temperature T c and the crystallization peak temperature T p , are found to be depending upon both heating rate as well as the composition from thermal analytical data. The investigation of crystallization kinetics indicates a single stage crystallization process. The glass transition energy E g and the crystallization activation energy E c are also evaluated from thermal analytical data. The analyzer has been used the most reliable non-isothermal kinetic methods. The value of kinetics parameters E g , E c and 'n' are calculated using non-isothermal kinetics methods. The analysis shows that the incorporation of Zinc content has a strong influence on the crystallization mechanism for the Se 100-x Zn x glassy system.

Effects of L‐ and D‐ form oligo(lactic acid)s grafted cellulose reinforcement on the thermal properties of poly(L‐lactic acid) composites

“…To determine the reaction kinetic factors (A, E a , and f (α)), various methods have been developed. They are iso-conversational and model-free methods such as Kissinger-Akahira-Sunose (KAS), 34 and Flynn-Wall-Ozawa (OFW) 35 methods. In this study, we considered the model-free KAS method to evaluate the kinetic energies (E a ) during the thermal degradation of cellulose and grafted cellulose.…”

Effects of Heat Treatment on Microhardness of Some Al-Cu Alloy Prepared by Vacuum Coating

“…Thermal annealing of amorphous materials can generally make several changes in these alloys. Bulk and surface crystallization, and nanocrystallisation can be imposed on these materials upon thermal annealing [6]- [8]. However low temperature thermal annealing can transfer these alloys to a more stable amorphous state through structural relaxation, enhancing their hardness, ductility and other properties and also increase in density [9]- [11].…”