Dipole ordering and ionic conductivity in NASICON-Type Na3Cr2(PO4)3 structures |
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| Authors: | A. S. Nogai S. Yu. Stefanovich A. A. Bush D. E. Uskenbaev A. A. Nogai |
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| Affiliation: | 1.Kazakh Agrotechnical University,Astana,Kazakhstan;2.Karpov Scientific and Research Physicochemical Institute,Moscow,Russia;3.Moscow Technological University (MIREA),Moscow,Russia |
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| Abstract: | The aspects of structure, dipole ordering, and ionic conductivity of the Na3Cr2(PO4)3 crystal with the four polymorphic phases (α, α', β, and γ) have been investigated. The features of the α-Na3Cr2(PO4)3 crystal structure and its dipole ordering and relaxation polarization in the low-temperature α and α' phases have been refined. The occurrence of Na3Cr2(PO4)3 dipole ordering in the α and α' phases and high ionic conductivity in the β and γ phases is attributed to the structural changes in the rhombohedral [Me2(PO4)3]–33∞ crystal frame upon phase transformations α → α', α' → β, and β → γ. A model for explaining the dipole ordering and ionic conductivity phenomena in Na3Cr2(PO4)3 is proposed. |
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