Abstract
A set of borotellurite glasses in the compositions, (B2O3)0.1-(TeO2)0.5-x-(MoO3)0.4-(Er2O3)x; x = 0.01, 0.02, 0.03, 0.04, 0.05 have been synthesized and investigated for structure, density and dc conductivity as a function of temperature. Powder XRD patterns confirmed non-crystalline nature of glasses. Density and molar volume both varied arbitrarily with Er2O3 nano particle concentration revealing dynamic nature of the glass network. Some parameters associated with polarons have been determined. Semiconducting behavior of the glasses has been established by dc conductivity data. Mott’s small polaron hopping (SPH) model fit to the conductivity data enabled to determine Debye’s temperature and activation energy for conduction. Both Conductivity and activation energy decreased with Er2O3 nano particle concentration which infer that the structure of the glasses is changing in such a way that hindrance to the polaronic motion is developed in the increasing order with increase of Er2O3 concentration. The conductivity data deviated from SPH fit has been analyzed using Mott’s variable range hopping model and from it the density of states at Fermi level has been determined. For the first time, polaron conduction mechanisms have been probed in borotellurite glasses doped with MoO3 and Er2O3.
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