Thermal Decomposition Studies of Cr x Mo 1-x Se 2 (x=0.25, 0.50, 0.75) Single Crystals

The thermal behavior of some mixed transition metal dichalcogenides Cr x Mo 1-x Se 2 (x=0.25, 0.50, 0.75) were investigated using different thermal techniques. These include thermogravimetry (TGA), derivative thermogravimetry (DTG) and differential thermal analysis (DTA). The thermogravimetry data allowed the determination of activation energy and frequency factor. The relative thermal stabilities of the studied compounds have been evaluates in terms of composition (x) and follow the order 0.25>0.50>0.75. The DTA pattern shows a strong endothermic transition around 550K. The different kinetic parameters: entropy, enthalpy and Gibbs free energy were evaluated using Piloyan-Novikova and Coats-Redfern relations.