Thermal and electric transport properties of (60−x)V2O5–xAs2O3–20Fe2O3–10CaO–10Li2O unconventional glassy system

This paper presents the results of kinematical studies of glass transition and crystallization in the unconventional glassy system (60−x)V2O5–xAs2O3–20Fe2O3–10CaO–10Li2O (x = 0, 10, 20, 30, 40 mol%) using differential scanning calorimetry (DSC). The glass transition temperatures (Tg), the onset crystallization temperatures (Tc), and the peak temperatures of crystallization (Tp) were found to be dependent on the compositions and the heating rates. From the dependence on heating rates of (Tg) and (Tp) the activation energy for glass transition (Eg) and the activation energy for crystallization (Ec) are calculated. The thermal stability of (60−x)V2O5–xAs2O3–20Fe2O3–10CaO–10Li2O was evaluated in term of, criteria ΔT = Tc − Tg. All the results confirm that the thermal stability increase with increasing As2O3 contents. From the electric–dielectric measurements it was found that, σdc, σac(ω) and θD/2 decrease with increasing As2O3 contents. It is also observed that the dielectric constant (ε1(ω)) and the loss factor (tan δ) decrease with increasing As2O3 contents in this glass system.