Determination of the activation energy of crystallization based up on Ozawa and Kissinger formalisms and thermal stability of V2O5-NiO- TeO2 glasses by differential scanning calorimetry (DSC)

In the present research work, (60-x)V2O5-xNiO-40TeO2 amorphous bulk compositions with different molar percentages of 0≤x≤20 mol%, were prepared by well-known  rapid melt-quenching method. Differential scanning calorimetry (DSC) at different heating rates (φ) was used to thermal analyze and to obtain more insight in to the thermal stability, glass forming tendency and so calorimetric characteristics of the present glasses. The characteristic temperatures such as glass transition temperature (Tg), the temperature corresponding to the onset of crystallization (Tx) and also the crystallization temperature (TCr) were obtained at different heating rates, to evaluate the key kinetic parameter of activation energy of crystallization (Ec) by using Ozawa and Kissinger methods. Generally, results of this work show that the glass with x=10 has the highest thermal stability and glass forming tendency and so has very good resistance against thermal shocks; for  the understudied samples, one can observe the decreasing trend of crystallization activation energy with increase of NiO content, which can be resulted by increasing of non-bridging oxygenchr('39')s (NBOs).