Vibrational, thermal and optical studies of 30TeO(2)-39.5B(2)O(3)-(30-x) ZnO-xLi(2)O-0.5 V2O5 (0 <= x <= 30 mol%) glass system

摘要

A series of glasses with novel composition 30TeO(2)-39.5B(2)O(3)-(30-x)ZnO-xLi(2)O-0.5V2O5 (0 <= x <= 30 mol%) were prepared using melt quenching technique. All glasses were characterized using XRD, Fourier transform infrared (FTIR) and Raman spectroscopies, Differential Scanning Calorimetry, Optical absorption and Electron Paramagnetic Resonance. The physical properties such as density, molar volume and oxygen packing density were calculated and discussed. FTIR and Raman spectral studies were performed to study the vibrational groups present in all the glasses. DSC analysis showed that the glass transition temperature (T-g) decreases with increase in Li2O content and the high thermal stability 150 degrees C was observed for all glasses. Various optical parameters were calculated and variations in these values were correlated with structural changes in the glass network as revealed by FTIR and Raman studies. The estimated spin-Hamiltonian parameters of VO2+ from EPR spectra of glasses suggest that VO2+ is in octahedral site with tetragonal distortion.