ESR spectroscopy of FeIII ions in sodium silicate glasses |
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| Authors: | E S Dunaeva E A Ugolkova N N Efimov V V Minin V M Novotortsev |
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| Institution: | 1. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russian Federation
2. N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky prosp., 119991, Moscow, Russian Federation
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| Abstract: | The state of FeIII ions doped in sodium silicate glasses of the composition (100 ? x)Na2O-xSiO2?y Fe2O3 (x = 75, 81 mol.%; y = 0.05?13 wt.%) was studied by electron spin resonance (ESR). X-band ESR spectra exhibited three resonance signals at g ≈ 2.0, 4.3, and 6. The computer simulation of ESR spectra was performed on the basis of spin-Hamiltonian of rhombic symmetry. The nature of observed signals was interpreted as a combination of five types of FeIII complexes. Three of them were clustered iron ions and two other were isolated paramagnetic ones. The ratio of observed forms was found for different glass compositions and various total amounts of FeIII ions in a matrix containing 0.55, 2.5, 4, 7, and 13 wt.% of Fe2O3. |
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