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

Abstract This paper presents the results of kinematical studies of glass transition and crystallization in the unconventional glassy system (60− x )V 2 O 5 – x As 2 O 3 –20Fe 2 O 3 –10CaO–10Li 2 O ( x = 0, 10, 20, 30, 40 mol%) using differential scanning calorimetry (DSC). The glass transition temperatures ( T g ), the onset crystallization temperatures ( T c ), and the peak temperatures of crystallization ( T p ) were found to be dependent on the compositions and the heating rates. From the dependence on heating rates of ( T g ) and ( T p ) the activation energy for glass transition ( E g ) and the activation energy for crystallization ( E c ) are calculated. The thermal stability of (60− x )V 2 O 5 – x As 2 O 3 –20Fe 2 O 3 –10CaO–10Li 2 O was evaluated in term of, criteria Δ T = T c − T g . All the results confirm that the thermal stability increase with increasing As 2 O 3 contents. From the electric–dielectric measurements it was found that, σ dc , σ ac ( ω ) and θ D /2 decrease with increasing As 2 O 3 contents. It is also observed that the dielectric constant ( e 1 ( ω )) and the loss factor (tan δ ) decrease with increasing As 2 O 3 contents in this glass system.