An Insight into the Correlation between Chemical Composition Changes of Aluminum-Iron-Polyphosphate Glasses and Thermal Properties

Abstract

The present study aimed to investigate the influence of the gradual substitution of Fe2O3 by Al2O3 on the thermal properties of polyphosphate glasses. The conducted considerations based on differential scanning calorimetry (DSC) and heating microscopy thermal analysis provided much essential information about the correlation between glass chemical composition and its characteristic parameters, such as transformation temperature, specific heat, crystallization temperature, crystallization enthalpy, the activation energy of crystal growth, melting temperature, and Angell glass thermal stability. The obtained estimation of viscosity changes as a function of temperature could be very helpful for researchers to correctly plan the vitrification process and thus radioactive waste immobilization. A precise analysis of DSC curves and X-ray diffraction patterns revealed the possibility of crystallization process design in order to create materials with different levels of crystallinity and phase composition. The drawn conclusions allow choosing the glass with the optimal concentration of Al2O3 and Fe2O3, which ensures the relatively low melting temperature, viscosity, and glass crystallization ability, with application potential in nuclear waste immobilization.

Thermal Stability of ZnO/Tm₂O₃ Substitution on Tellurite-Zinc-Bismuth-Sodium (TZBN) Glasses

“…On the other hand, the melting temperature (Tm) values of the TZBN doped Thulium glasses showed a steady increase from 539°C to 578°C which illustrated in Fig 3 . It is possible that the Tm ions increase the structural stability of the glass network, leading to a higher melting point [27]. Additionally, the increase in Tm suggests that the glass is more resistant to thermal degradation [28]. Overall, these results suggest that Thulium doping has a notable impact on the thermal properties of TZBN glasses.…”