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Mössbauer effect and electron paramagnetic resonance studies on zinc borate glasses containing transition metal oxides

Anavekar, RV and Devaraj, N and Ramesh, KP and Ramakrishna, J (1992) Mössbauer effect and electron paramagnetic resonance studies on zinc borate glasses containing transition metal oxides. In: Physics and Chemistry of Glasses, 33 (4). pp. 116-121.

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Abstract

Studies have been carried out in glasses containing Fe2O3, V2O5, and Fe2O3 + V2O5. Mossbauer studies in the ZnO-B2O3-Fe2O3 system show that iron is present as Fe3+ with tetrahedral coordination and that the isomer shift and the quadrupole splitting decrease with increase of Fe2O3 Content; similarly, the isomer shift and quadrupole splitting are also found to decrease with increasing ZnO. On the other hand, in the Na2O-ZnO-B2O3-Fe2O3 system, the isomer shift increases with Na2O or ZnO while the quadrupole splitting is fairly insensitive. Electron paramagnetic resonance in the ZnO-B2O3-Fe2O3 system shows signals at g = 4.20 and 2.0, whose intensity and linewidth show strong dependence on Fe2O3 content. In the ZnO-B2O3-V2O5 system, electron paramagnetic resonance shows that vanadium is present as the vanadyl complex, and the hyperfine coupling constants, A(parallel-to) and A(perpendicular-to) decrease with increasing V2O5 content; on the other hand, g(parallel-to) decreases and g(perpendicular-to) increases slightly, indicating an increase in tetragonal distortion. Zinc borate glasses containing Fe2O3 + V2O5 do not show the hyperfine structure of V4+ due to the interaction between Fe3+ and V4+

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Society of Glass Technology.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 May 2011 05:47
Last Modified: 05 May 2011 05:47
URI: http://eprints.iisc.ernet.in/id/eprint/37260

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