Dinuclear manganese centers in the manganese–lead–tellurate glasses
| Autor: | Monica Culea, E. Culea, Simona Rada, A. Dehelean |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Inorganic chemistry
chemistry.chemical_element Manganese Analytical Chemistry Ion law.invention chemistry.chemical_compound Paramagnetism law Spectroscopy Fourier Transform Infrared Fourier transform infrared spectroscopy Electron paramagnetic resonance Instrumentation Spectroscopy Octahedral symmetry Doping Electron Spin Resonance Spectroscopy Tellurate Atomic and Molecular Physics and Optics Crystallography Lead chemistry Spectrophotometry Glass Tellurium |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 79:320-324 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2011.02.025 |
| Popis: | 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, 40 mol% 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. |
| Databáze: | OpenAIRE |
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