Electronic State of Vanadium Ions in Li1+xV3O8 According to EPR Spectroscopy
✍ Scribed by N.V. Kosova; V.F. Anufrienko; N.T. Vasenin; S.V. Vosel; E.T. Devyatkina
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 196 KB
- Volume
- 163
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
EPR spectroscopy is used to study the electronic state of vanadium ions in HT-and LT-Li 1؉x V 3 O 8 . It is shown that in both cases the EPR spectra observed are attributed to vanadyl VO 2؉ ions (localized electron centers) with weak exchange interaction. The other type of registered electrons is characterized by larger mobility through a few V 5؉ 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-Li 1؉x V 3 O 8 di4ers from LT-Li 1؉x V 3 O 8 by the sloping form of its spectrum at g # # range connected with two types of VO 2؉ ions di4erent in the direction of the crystal 5eld axis corresponding to a short V؍O 2؉ bond.
2002 Elsevier Science (USA)