Optical, physical and structural studies of vanadium doped P 2O5-BaO-Li2O glasses

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Lakshmikantha, R. and Ayachit, N.H. and Anavekar, R.V. (2014) Optical, physical and structural studies of vanadium doped P 2O5-BaO-Li2O glasses. Journal of Physics and Chemistry of Solids, 75 (2). pp. 168-173. ISSN 0022-3697

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Official URL: https://doi.org/10.1016/j.jpcs.2013.09.004

Abstract

Glasses in the compositions (Li2O)25–(BaO)25–(P2O5)50−x–(V2O5)x (with x=0.5,1.0,1.5,2.0,2.5, and 3.0 mol%) have been prepared by the conventional melt quenching technique. X-ray powder diffractrogram show broad peaks which conforms glassy nature of the sample. Differential scanning calorimetry (DSC) thermograms show characteristic glass transition temperature (Tg) and it increases with increasing substitution of V2O5 for P2O5. The measured physical parameters like density, refractive index, ionic concentration and electronic polarizability are found to vary linearly with increasing x. Infrared spectra exhibits few bands, which are attributed to (P=O)AS, (P=O)S, (V=O), (P–O–P)AS,P–O–V, (P–O–P)AS and O–P–O vibrations. The optical absorption spectra of VO2+ ions in these glasses show three bands and are assigned to the 2B2→ 2E,2B2→ 2B1 and 2B2→ 2A1 transitions. Electron paramagnetic resonance spectra of all the glass samples exhibit resonance signals characteristic of VO2+ ions. The values of Spin-Hamiltonian parameters indicate that the VO2+ ions are present in octahedral sites with tetragonal compression and belong to C4V symmetry.

Item Type: Article
Additional Information: cited By 2
Uncontrolled Keywords: Electron paramagnetic resonance spectrum; Electron paramagnetic resonances (EPR); Electronic-polarizability; Ferroelectric domains; Ionic concentrations; Melt quenching techniques; Physical parameters; Spin Hamiltonian parameters, Differential scanning calorimetry; Electron resonance; Electron spin resonance spectroscopy; Ions; Lithium; Paramagnetic resonance; Paramagnetism; Refractive index; X ray diffraction, Glass
Subjects: Faculty of Science > Pure Sciences > Physics
Divisions: Jnana Bharathi / Central College Campus > Department of Physics
Depositing User: Mr. Kirana Kumar D
Date Deposited: 20 Apr 2016 05:20
Last Modified: 20 Apr 2016 05:20
URI: http://eprints-bangaloreuniversity.in/id/eprint/3163

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