Electron spin resonance of chromia-yttria solid solutions |
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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 chromia-yttria solid solutions have been studied at room temperature for Cr concentrations between 0.20 and 2.00 mol%. Isolated Cr3+ ions in sites with two different symmetries were observed, as well as well as Cr3+ ions coupled by the exchange interaction. The relative concentration of isolated to coupled Cr3+ ions decreases with increasing chromium concentration. The results are consistent with the assumption that the chromium ions occupy preferentially the C2 symmetry sites. A theoretical calculation based on this model yields an effective range of the exchange interaction between Cr3+ ions of 0.64 nm, of the same order as that of Cr3+ ions in MgO. |
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Keywords: | A. Ceramics |
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