Kinetic characterization of TeO2-Bi2O3 -V2O5 -Na2O -TiO2 glass system

- Kinetic parameters of TeO2 -Bi2O3 -V2O5 - Na2O -TiO2 glasses were estimated.
- The glass transition temperature and the thermal stability increased with TiO2.
- The thermodynamic fragility of the studied glasses decreased with TiO2.
- Activation energy of glass transition and crystallization increased with TiO2.
- Avrami exponent showed that the crystallization process was surface nucleation.

In continuation of our earlier work on (the mechanical and thermal properties of TeO2-Bi2O3 -V2O5 - Na2O-TiO2 glass system), in this study, we have investigated the kinetic parameters of this system as a function of increasing TiO2 mol% by using differential scanning calorimetry (DSC) data under non-isothermal (isochronal) conditions. The thermodynamic fragility (F) and the glass forming tendency (Kg), (TgTm) factors of the present glass have been evaluated to determine the relationship between the change in the structure and the thermal stability of the glass. The activation energies of both glass transition (Eg) and crystallization (Ec) processes have been evaluated by the methods of Kissinger and Ozawa by the data obtained from (DSC) at heating rates (β) 10, 15, 20 and 25 K/min. The quantitative interpretation of these kinetic parameters has been carried out by coupling with the previous estimated elastic moduli. The kinetic Avrami coefficient (n) was also calculated by several estimation methods to determine and confirm the mechanism of the crystallization process.