Abstract
Tellurite glasses containing Sb2O3 has been prepared from the conventional melt quenching technique. Optical parameters were determined from optical absorption data. Variation of optical band gap (Eopt), Urbach energy (ΔE), refractive index (n), optical basicity (Ʌ), and electronic polarizability (α) with the variation in Sb2O3 content is studied. Fourier transform infrared (FTIR) and Raman spectroscopic studies proposed that the glass consists of [TeO3] and [TeO4] and [SbO3] and [NbO6] structural units. The glass transition temperature (Tg), onset crystallization temperature (To), thermal stability (ΔT) of the glasses were studied by Differential scanning calorimetry (DSC). Glass transition temperature (Tg) decreased with increase in Sb2O3 in these glasses. The Spin Hamiltonian parameters of VO2+ ions showed a linear decrease with decrease in the Sb2O3. EPR results suggest that VO2+ occupies octahedral site with tetrahedral compression. From structural, thermal and optical studies it is clear that the variation in the Sb2O3 in the glass does affect the structural arrangement of atoms inside the glass network which results in variation in glass properties.
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