Omkaram , I and Chakradhar, R P S and Rao, J L (2007) EPR, optical, infra red and Raman studies of VO2+ ions in polyvinylalcohol films. Physica B-Condensed Matter, 388 (1-2). pp. 318-325. ISSN 0921-4526

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Abstract

Electron paramagnetic resonance (EPR), optical, infrared and Raman spectral studies have been carried out on vanadyl ions doped in polyvinylalcohol (PVA) films. The spin-Hamiltonian parameters (g and A) and the molecular orbital coefficients (beta2*2 and k) have been evaluated. The values of spin-Hamiltonian parameters confirm that the vanadyl ions are present in PVA films as VO2+ molecular ions in an octahedral site with a tetragonal compression (C4v). The temperature variation EPR studies reveal that the variation of number of spins with temperature is in accordance with Boltzmann law. It is interesting to observe that the variation of susceptibility with temperature obeys Curie–Weiss law. The FT-IR and FT-Raman spectrum exhibits few bands, which are attributed to O–H, C–H, CQC and C–O groups of stretching and bending vibrations. The optical absorption spectrum exhibits two bands, which are assigned to 2B2g->2B1g and 2B2g->2Eg transitions in the decreasing order of energy.

Item Type:	Article
Uncontrolled Keywords:	Polyvinylalcohol films; VO2+ ions; EPR; Optical; Infrared; Raman
Subjects:	Microstructure and Characterization
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	15 Mar 2012 07:33
Last Modified:	15 Mar 2012 07:33
URI:	http://cgcri.csircentral.net/id/eprint/1227

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