Author(s) Rada, S.; Dehelean, A.; Culea, M.; Culea, E.
Journal Spectrochim Acta A Mol Biomol Spectrosc
Date Published 2011 Jul

FTIR, UV-VIS and EPR spectra of manganese doped lead-tellurate glasses with composition xMnO·(100-x)[4TeO2·PbO2] where x=0, 1, 5, 10, 20, 30, 40mol% have been studied. The FTIR spectra show the formation of the Mn-O-Pb and Mn-O-Te bridging bonds by increasing of MnO concentration. The UV-VIS spectra show the Mn(+3) species exhibit pronounced absorption, which masks the Mn(+2) spin-forbidden absorption bands when Mn(+2) ions are in high concentrations in these glasses. The EPR spectra exhibit resonance signals characteristic of Mn(+2) ions. The resonance signal located at g≈2 is due to Mn(+2) ions in an environment close to octahedral symmetry, whereas the resonance at g≈4.3 and 3.3 are attributed to the rhombic surroundings of the Mn(+2) ions. The increase in the MnO content gives rise to absorption at g≈2.4 and the paramagnetic ions are involved in dinuclear manganese centers.

DOI 10.1016/j.saa.2011.02.025
Keywords Electron Spin Resonance Spectroscopy; Glass; Lead; Manganese; Spectrophotometry; Spectroscopy, Fourier Transform Infrared; Tellurium
ISSN 1873-3557
Citation Rada S, Dehelean A, Culea M, Culea E. Dinuclear manganese centers in the manganese-lead-tellurate glasses. Spectrochim Acta A Mol Biomol Spectrosc. 2011;79(2):320-4.

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