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This article is cited in 6 scientific papers (total in 6 papers)
Ferroelectricity
Dipole ordering and the ionic conductivity in Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$-type NASICON-like structures
A. S. Nogaia, А. А. Nogaib, S. Yu. Stefanovichc, Zh. M. Solikhodzhab, D. E. Uskenbayeva a Saken Seifullin Kazakh AgroTechnical University
b Eurasian National University named after L.N. Gumilyov, Nur-Sultan
c Lomonosov Moscow State University
Abstract:
The problems of the structural features, the dielectric and conducting properties of Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$ polycrystals prepared by hot pressing have been studied. The Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$ polycrystals in the $\alpha$ and $\beta$ phases are shown to have higher conducting properties than the $\alpha$ and $\beta$ phases of the single crystals grown by the solution–melt method. The regularities of the appearance of the dipole ordering, the ionic and superionic conductivities related to phase transitions and structural changes in the $\{$[Fe$_{2}$(PO$_{4})_{3}]^{3-}\}_{3\infty}$ rhombohedral crystalline frame during polymorphic transformations are refined. The problems of the relaxation polarization in the $\alpha$ and $\beta$ phases of Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$ are discussed. A model for explaining the dipole ordering and the ionic conductivity in Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$ is proposed.
Keywords:
polycrystal, ionic conductivity, phase transitions, crystalline framework, crystalline phase, superionic phase.
Received: 28.01.2020 Revised: 28.01.2020 Accepted: 11.03.2020
Citation:
A. S. Nogai, А. А. Nogai, S. Yu. Stefanovich, Zh. M. Solikhodzha, D. E. Uskenbayev, “Dipole ordering and the ionic conductivity in Na$_{3}$Fe$_{2}$(PO$_{4}$)$_{3}$-type NASICON-like structures”, Fizika Tverdogo Tela, 62:8 (2020), 1216–1225; Phys. Solid State, 62:8 (2020), 1370–1379
Linking options:
https://www.mathnet.ru/eng/ftt8344 https://www.mathnet.ru/eng/ftt/v62/i8/p1216
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