Spectroscopic Investigations and Physical Properties of Alkali Arsenate Boro-tellurite Glasses

Arsenate boro-tellrite glasses doped with K2O at the expense of TeO2 have been prepared by the normal melt quenching technique. The structural and optical analysis of glasses is carried out by XRD, FTIR, Raman, DSC, density measurement, and UV-visible spectroscopic techniques. X-ray diffraction (XRD) patterns of the glass samples confirm the amorphous nature. The physical parameters of all the glasses were also evaluated with respect to the composition. The elastic moduli and Debye temperature were calculated in terms of Makishima-Mackenzie model. The optical absorption edge (lambda(c)), optical band gap (E-g), and Urbach energy (Delta E) were determined from the absorption spectra. Results from FTIR and Raman spectra indicate that K2O acts as a network modifier even in small quantities by converting three coordinated to four coordinated boron atoms.