DOI: 10.1142/s0217979203020703. A Study of Electron Paramagnetic Resonance and Optical Absorption Spectra of VO2+ Ions in Alkali Barium Phosphate Glasses

A Study of Electron Paramagnetic Resonance and Optical Absorption Spectra of VO2+ Ions in Alkali Barium Phosphate Glasses

10.1142/s0217979203020703

Crossref journal-article

World Scientific Pub Co Pte Lt

International Journal of Modern Physics B (219)

Abstract

The electron paramagnetic resonance and optical absorption spectra of VO 2+ ions in different alkali barium phosphate glasses have been studied and the results have been analysed using C4v symmetry. The EPR spectrum shows eight hyperfine lines characteristic of VO 2+ ions. From the observed EPR spectra, the spin-Hamiltonian parameters, Fermi contact interaction parameter k, dipolar hyperfine coupling parameter P have been evaluated. The EPR spectra exhibit a marked concentration dependence. The EPR spectra were also recorded at different temperatures. The number of spins participating in resonance is found to be increasing with decreasing temperature. The paramagnetic susceptibility χ is calculated from the EPR data. As the temperature decreases, χ increases in accordance with Curie's law. The optical absorption spectrum exhibits two bands corresponding to the transitions 2B2g → 2B1g and 2B2g → 2Eg , characteristic of VO 2+ ions in octahedral symmetry with tetragonal distortion. From the ultraviolet edges of these optical absorption spectra, the optical band gap energies (Eopt) of the glass samples have been calculated. The optical band gap energy varies with alkali content. By correlating EPR and optical absorption data, the molecular orbital coefficients have been evaluated. The theoretical values of optical basicity of the glasses have also been evaluated.

Bibliography

Kumar, V. R., Chakradhar, R. P. S., Murali, A., Gopal, N. O., & Rao, J. L. (2003). A Study of Electron Paramagnetic Resonance and Optical Absorption Spectra of VO2+ Ions in Alkali Barium Phosphate Glasses. International Journal of Modern Physics B, 17(16), 3033â3047.

Authors 5

V. Ramesh Kumar (first)
R. P. S. Chakradhar (additional)
A. Murali (additional)
N. O. Gopal (additional)
J. Lakshmana Rao (additional)

References 38 Referenced 12

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Dates

Type	When
Created	22 years ago (Aug. 4, 2003, 2:02 a.m.)
Deposited	6 years ago (Aug. 7, 2019, 7:27 a.m.)
Indexed	2 years ago (Aug. 27, 2023, 11:08 a.m.)
Issued	22 years, 2 months ago (June 30, 2003)
Published	22 years, 2 months ago (June 30, 2003)
Published Online	13 years, 7 months ago (Jan. 25, 2012)
Published Print	22 years, 2 months ago (June 30, 2003)

Funders 0

None

BibTeX

@article{Kumar_2003, title={A Study of Electron Paramagnetic Resonance and Optical Absorption Spectra of VO2+ Ions in Alkali Barium Phosphate Glasses}, volume={17}, ISSN={1793-6578}, url={http://dx.doi.org/10.1142/s0217979203020703}, DOI={10.1142/s0217979203020703}, number={16}, journal={International Journal of Modern Physics B}, publisher={World Scientific Pub Co Pte Lt}, author={Kumar, V. Ramesh and Chakradhar, R. P. S. and Murali, A. and Gopal, N. O. and Rao, J. Lakshmana}, year={2003}, month=jun, pages={3033–3047} }

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