Raman, Brillouin, and nuclear magnetic resonance spectroscopic studies on shocked borosilicate glass Raman spectroscopic investigation of the structure of silicate glasses. IV. Alkali-silico-germanate glasses J. Chem. Phys. 95, 776 (1991); 10.1063/1.461084 Raman spectroscopic study of nitrate glasses J. Chem. Phys. 69, 2639 (1978); 10.1063/1.436912 Raman spectroscopic investigation of the structure of silicate glasses. I. The binary alkali silicates
AbstractMixed alkali borate glasses of composition xLi 2 O-(30-x)K 2 O-10WO 3 -60B 2 O 3 (0 ≤ x ≤ 30 mol%) were prepared by melt quench technique. The structure of present glass system was investigated by Raman spectroscopy. The characteristic bands of these glasses due to the stretching and bending vibrations were identified and analyzed by the increasing of alkali content. This fact allowed us to identify the specific structural units which appear in these glasses and thus to point out the network modifier role of alkali oxide for low concentrations and its former role at high concentrations
Electron paramagnetic resonance (EPR) and optical absorption studies of xMgO-(25-x) Li 2 O-50B 2 O 3 -25As 2 O 3 glasses were made by introducing Cu 2+ as a spin probe. The EPR spectra of all the glass samples recorded at X-band frequencies have similar spectral features. The Cu 2+ ions are in well-defined axial sites, but subjected to small distortion leading to the broadening of the spectra. The spin-Hamiltonian parameter values indicate that the ground state of Cu 2+ is d x2-y2 and the site symmetry around Cu 2+ ions is tetragonal distorted octahedral. The optical absorption spectra exhibited a broadband corresponding to the d-d transition bands of Cu 2+ ion. By correlating EPR and optical data, the bond parameters were evaluated and the values show purely ionic nature for the in-plane σ bonding and in-plane π bonding. The out-of-plane π bonding is moderately covalent.
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