Electron spin resonance of diluted solid solutions of MnO2 in Y2O3 |
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Authors: | R.S. de Biasi M.L.N. Grillo |
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Affiliation: | a Seção de Engenharia Mecânica e de Materiais, Instituto Militar de Engenharia, 22290-270 Rio de Janeiro, RJ, Brazil b Instituto de Física, Universidade do Estado do Rio de Janeiro, 20550-013 Rio de Janeiro, RJ, Brazil |
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Abstract: | Electron spin resonance spectra of Mn2+ in diluted solid solutions of MnO2 in Y2O3 have been studied at room temperature for Mn concentrations between 0.20 and 2.00 mol%. Isolated Mn2+ ions in sites with two different symmetries were observed, as well as Mn2+ ions coupled by the exchange interaction. The relative concentration of isolated to coupled Mn2+ ions decreases with increasing manganese concentration. The results are consistent with the assumption that the manganese ions occupy preferentially the C2 symmetry sites. A theoretical calculation based on this model yields an effective range of the exchange interaction between Mn2+ ions of 0.53 nm, of the same order as that of Mn2+ ions in CaO. |
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Keywords: | A. Ceramics C. Electron paramagnetic resonance (EPR) |
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