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Spectroscopic investigations of manganese ions in microwave-prepared NaPO3-PbO glasses

Vaidhyanathan, B and Kumar, C Prem and Rao, JL and Rao, KJ (1998) Spectroscopic investigations of manganese ions in microwave-prepared NaPO3-PbO glasses. In: Journal of Physics and Chemistry of Solids, 59 (01). pp. 121-128.

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Abstract

The EPR spectra of microwave-prepared 70NaPO(3):30PbO glasses containing different weight percentages of manganese ions have been studied. The EPR spectra exhibit a well-resolved hyperfine pattern at g(eff) approximate to 2.0. Optical absorption, fluorescent emission and excitation spectra of the glasses have been examined. The absorption spectrum exhibits a peak near 500 nm and this has been attributed to the spin-allowed E-5(g) --> T-5(2g) transition of Mn3+ ions. The emission spectrum shows a band at 595 nm which has been assigned to the T-4(1g)(G) --> (6)A(1g)(S) spin-forbidden transition of Mn2+ ions in octahedral coordination. Concentration quenching of fluorescence was found to occur above 0.75 wt% of Mn2+ ions. The excitation spectra exhibit four bands characteristic of Mn2+ ions in octahedral coordination. From the observed band positions of the excitation spectra, the crystal field parameter D-q and the Racah interelectronic repulsion parameters, B and C have been calculated. A structural model is proposed based on the IR, Raman and MASNMR studies according to which Mn2+ ions are likely to occupy sites similar to Na+ ions in these glasses.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: glasses;EPR;optical properties;infrared spectroscopy;Raman spectroscopy.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 21 Dec 2009 09:24
Last Modified: 19 Sep 2010 05:27
URI: http://eprints.iisc.ernet.in/id/eprint/19262

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