Electronic State of Vanadium Ions in Li1+xV3O8 According to EPR Spectroscopy |
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| Authors: | N.V. Kosova V.F. AnufrienkoN.T. Vasenin S.V. VoselE.T. Devyatkina |
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| Affiliation: | a Institute of Solid State Chemistry, Siberian Branch of Russian Academy of Science, 18 Kutateladze, Novosibirsk, 630128, Russiab Boreskov' Institute of Catalysis, Siberian Branch of Russian Academy of Science, 18 Kutateladze, Novosibirsk, 630128, Russiac Institute of Mineralogy and Petrography, Siberian Branch of Russian Academy of Science, 18 Kutateladze, Novosibirsk, 630128, Russia |
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| Abstract: | EPR spectroscopy is used to study the electronic state of vanadium ions in HT- and LT-Li1+xV3O8. It is shown that in both cases the EPR spectra observed are attributed to vanadyl VO2+ ions (localized electron centers) with weak exchange interaction. The other type of registered electrons is characterized by larger mobility through a few V5+ ions, i.e., by a higher degree of delocalization (electron gas). Based on the analysis of the temperature dependence of the EPR line width, it is stated that the exchange interaction between localized electron centers proceeds through electron gas (C-S-C relaxation). It is found that HT-Li1+xV3O8 differs from LT-Li1+xV3O8 by the sloping form of its spectrum at g∥ range connected with two types of VO2+ ions different in the direction of the crystal field axis corresponding to a short V=O2+ bond. |
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| Keywords: | lithium-vanadium oxide EPR vanadyl ions C-S-C relaxation. |
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