Influence of substitutions on the structure, ionic conductivity, and phase transitions in the system of Na3Fe2(1-x)Sc2x(PO4)3(0≤x≤0.06) solid solutions
Nogai A.S. Nogai A.A. Nogai E.A. Bush A.A. Uskenbaev D.E.
2023L.N. Gumilyov Eurasian National University
Eurasian Journal of Physics and Functional Materials
2023#7Issue 2107 - 114 pp.
The article presents data on the study of the effect of substitutions of M-cations in the system of Na3Fe2(1-x)Sc2x(PO4)3 solid solutions (in the concentration range 0 ≤ x ≤ 0.06) on the crystal structure, ionic conductivity, and also on the temperature of phase transitions Tα→β, Tβ→γ. It is shown that samples of Na3Fe2(1-x)Sc2x(PO4)3 (0 ≤ x ≤ 0.06) solid solutions are monoclinically distorted, and the structure parameters increase linearly with increasing dopant concentration. Moreover, in the studied samples of solid solutions, an increase in the conductivity of the α -phase and a decrease in the β - and γ -phases are observed, as well as a decrease in the temperatures Tα→β and Tβ→γ. It is concluded that these changes are associated with both local deformations of the anionic part of the crystalline structure {[Fe2(1-x)Sc2x(PO4)]3-}3∞, and violation of the regularity of the crystal structure.
dopant , ionic conductivity , phase transitions , polycrystal , solid solutions , structural parameters
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S. Seifullin Kazakh Agrotechnical Research University, Astana, Kazakhstan
Russian Technological University MIREA, Moscow, Russian Federation
S. Seifullin Kazakh Agrotechnical Research University
Russian Technological University MIREA
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