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This article is cited in 7 scientific papers (total in 7 papers)
Dielectrics
Antisite defects and valence state of vanadium in Na$_{3}$V$_{2}$(PO$_{4}$)$_{3}$
F. A. Nizamova, P. N. Toguleva, D. R. Abdullina, S. M. Khantimerova, P. Balayab, N. M. Suleimanova a Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences
b National University of Singapore
Abstract:
Electron paramagnetic resonance (EPR) studies have been performed with the aim of determining the valence state and local crystal structure of the nearest environment of vanadium ions in the initial, charged, and discharged samples of the cathode material Na$_{x}$V$_{2}$(PO$_{4}$)$_{3}$ (1 $\le x\le$ 3). It has been found that the charged sample ($x$ = 1) is characterized by an intense signal corresponding to V$^{4+}$ ions located in a highly distorted octahedral crystal field. An EPR signal with the $g$-factor close to the $g$-factor of the V$^{4+}$ ion has also been observed in the initial sample ($x$ = 3), where the intensity of the resonance signal is one order of magnitude lower than that in the charged sample. It has been revealed that the resonance signal under consideration is associated with the formation of antisite defects when a part of vanadium ions are located in sites of sodium ions. It has also been found that the intensity of this signal increases after a complete charge–discharge cycle ($x$ = 3).
Keywords:
Electron Paramagnetic Resonance Spectrum, Electron Paramagnetic Resonance Signal, Electron Paramagnetic Resonance Line, Discharge Cycle, Antisite Defect.
Received: 27.07.2015
Citation:
F. A. Nizamov, P. N. Togulev, D. R. Abdullin, S. M. Khantimerov, P. Balaya, N. M. Suleimanov, “Antisite defects and valence state of vanadium in Na$_{3}$V$_{2}$(PO$_{4}$)$_{3}$”, Fizika Tverdogo Tela, 58:3 (2016), 464–468; Phys. Solid State, 58:3 (2016), 475–480
Linking options:
https://www.mathnet.ru/eng/ftt10040 https://www.mathnet.ru/eng/ftt/v58/i3/p464
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