Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 357, Issue 19-20, Pages 3442-3446Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2011.06.013
Keywords
Alkali bismuth borate glasses; Vanadyl ions; Glass transition temperature; EPR; Optical basicity
Funding
- UGC New Delhi, India
Ask authors/readers for more resources
Glasses with composition 15 Li(2)O- 15K(2)O- 10Bi(2)O(3)- (60 - x) B(2)O(3): xV(2)O(5) where x = 1, 3, 5, 7, and 9 mol% are prepared by normal melt-quench technique. Characterization of the prepared samples is done using X-ray diffraction, density and differential scanning calorimetry. The density and molar volume are found to increase with increasing x whereas the glass transition temperature decreases. Electron paramagnetic resonance spectra of the prepared samples are recorded using EPR-spectrometer operating in the X-band frequency. The resonance spectra are well resolved for x >= 5 mol% and the intensity of the resonance peak is found to increase with increasing x. The values of spin-Hamiltonian parameters (SHP) and molecular orbital coefficients are evaluated. From the values of SHPs it is concluded that V(4+) ions in the present glass system exist as vanadyl ions in octahedral co-ordination with tetragonal compression. It is observed that the SPHs depend slightly on the relative concentration of V(2)O(5). Further, the theoretical optical basicity of the glasses has also been evaluated and it is observed that the changes in optical basicity values are in accordance with the changes in SHPs. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available