A series of quaternary glass systems with the composition 79TeO 2-(20−x)Nb 2 O 5-xB 2 O 3-1V 2 O 5 was prepared using the melt quench technique. Such studies as optical absorption, Raman, FTIR spectroscopy, EPR and DSC were carried out on the glass system. The physical properties, such as density (ρ) and molar volume (V M), were determined. The Urbach energy (E), optical band gap (E opt), optical basicity (Λ), refractive index (n) and electron polarizability (α) of the glasses were determined from optical absorption data. Spin-Hamiltonian parameters of VO 2+ ions were calculated from the EPR data. With the gradual substitution of B 2 O 3 at the expense of Nb 2 O 5 , the density and optical band gap of the glasses decreased, and the electronic polarizability increased. EPR spectra revealed that VO 2+ occupies an octahedral site with tetrahedral compression. Spin-Hamiltonian parameters g || and g ⊥ increased as B 2 O 3 content increased in the glass. The glass transition temperature (T g) also decreased as the B 2 O 3 content in the glass increased.
The preparation and spectroscopic studies of Cu 2+ in B 2 O 3 non-linear optical glassy system have been studied. From IR studies, it is observed at low concentration of PbO (less than 40 mole%), it acts as a glass modifier. At higher concentration, it takes part in the network. The hyperfine splitting in the parallel features of ESR spectra of Cu 2+ are recorded for all concentration of PbO. There are considerable changes in g || and A || values with the increasing concentration of PbO, where as no perceptible changes is observed in g ⊥ & A ⊥ values. These changes clearly indicate a structural change in the glass system. The observed absorption peak of Cu 2+ found to go through a maximum at 40-mole% of PbO. The bonding parameters calculated from both optical and ESR data are found to change with PbO concentration.
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