Magnetic and spectroscopic investigation of partially reduced vanadium pentoxides. I. α-CuxV2O5 |
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Authors: | FY Robb WS Glaunsinger |
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Institution: | Department of Chemistry, Arizona State University, Tempe, Arizona 85281 USA |
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Abstract: | The electron paramagnetic resonance (EPR) and magnetic susceptibility of both powdered and crystalline α-CuxV2O5 near the compositional limit have been studied as a function of temperature. The EPR data indicate that the paramagnetic species are isolated V4+ centers in a nearly axially symmetric ligand field. It is demonstrated that reasonably precise EPR parameters can be derived from powdered spectra. The narrowness of the EPR line suggests that the spectra are motionally narrowed via thermally activated hopping of the paramagnetic electron of V4+. Expressions are derived for the temperature-dependent magnetic moments of the octahedral 2T2g term under the combined perturbation of spin-orbit coupling and an axially symmetric ligand field, and the susceptibility data are interpreted in terms of this model. It is found that the sixfold degenerate 2T2g level is split into three levels with the lowest and highest levels possessing a magnetic moment and the intermediate level having no moment. This model is also consistent with the g-tensor and can account for the temperature dependence of the EPR linewidth. |
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