Abstract
In this research, xMoO3–(
60 − x)V2O5–40TeO2 oxide glasses with (0 ≤ x ≤ 60) have been prepared by common meltquenching
method. Differential scanning calorimetry (DSC) at different heating rates (φ) was used to study non-isothermal
thermal analysis, and also to gain more insight in to the Hruby index thermal stability, crystal growth index (n), glass forming
tendency and so calorimetric characteristics of the present glasses. Also, the effects of the heating rate and MoO3
content on
the glass transition temperature (
Tg) and crystallization temperature (
TCr) were studied. Further structural investigations were
done by FESEM, EDX and Map. The glass transition temperature, glass transition region, the temperature corresponding
to the onset of crystallization (
Tx) and also the crystallization temperature were obtained at different heating rates; heating
rate dependence of these parameters was employed estimate the key kinetic parameters of glass transition and crystallization
activation energy by using Moyinhan, Ozawa, Kissinger and Avrami methods. Calorimetric curves were used to plot the specific
heat capacity curves versus temperature at the constant pressure. In addition, the compositional dependence of the heat
capacity and fragility parameter were investigated. Generally, results of this work show that the glass with x = 20 mol% has
the highest thermal stability and glass forming tendency and samples having 10 and 20% of MoO3
are the optimal samples
(with the least fragility) for thermomechanical applications and also in optical fibers.