Effect of Dy₂O₃ on Physical, Properties of B₂O₃–TeO₂–ZnO–Li₂O–WO₃ Glasses

Abstract—Effect of Dy₂O₃ on the properties of borotellurite glasses, (B₂O₃)_0.2–(TeO₂)_0.22 – x–(ZnO)_0.28–(Li₂O)_0.20–(WO₃)_0.10–(Dy₂O₃)_x; x = 0.01 to 0.06 has been investigated. Density increased and molar volume decreased with increase of Dy₂O₃ and they were explained in terms of composition. Glass transition temperature increased and thermal stability decreased with increase of Dy₂O₃ content. Conductivity increased and its activation energy decreased up to 0.04 mole fraction of Dy₂O₃ and behaved in opposite way for higher amounts of Dy₂O₃. These results are ascribed to network changes occurring around 0.04 mole fractions of Dy₂O₃. For the first time the effect of Dy₂O₃ on conductivity has been reflected in this fashion. Polaron hopping distance, polaron radius and Debye’s temperature were determined and discussed appropriately.