INFLUENCE OF SOLID-PHASE AND MELT SYNTHESIS METHODS ON THE STRUCTURE AND ELECTROCHEMICAL PROPERTIES OF Na3Fe2(PO4)3 POLYCRYSTALS

Authors

Adolf S. NOGAI, Kazakh Agrotechnical Research University, Astana, KazakhstanFollow
Artur A. NOGAI, Kazakh Agrotechnical Research University, Astana, KazakhstanFollow
Daniyar E. USKENBAEV, Kazakh Agrotechnical Research University, Astana, KazakhstanFollow
Eleonora A. NOGAI, Kazakh Agrotechnical Research University, Astana, KazakhstanFollow
Alexander A. BUSH, MIREA - Russian Technological University, Moscow, RussiaFollow

Abstract

The article studies the influence of solid-phase and melt synthesis methods on the structure and electrochemical properties of the Na₃Fe₂(PO₄)₃ polycrystals. If the solid-phase synthesis of the Na₃Fe₂(PO₄)₃ polycrystals (type 1 of samples) is carried out using ceramic technology, initially glassy precursors are first obtained by melting the starting materials under the influence of optical radiation energy at the melt synthesis method, and the Na₃Fe₂(PO₄)₃ polycrystals are obtained after firing (type 2 of samples). With this method, the synthesis of polycrystals occurs quickly under sharp temperature-gradient conditions, therefore, the monoclinic distortions of α-Na₃Fe₂(PO₄)₃ structure are partially removed under the influence of compressive deformation. Due to the greater symmetrization of the α-Na₃Fe₂(PO₄)₃ crystal structure and the higher density of type 2 samples, their electrochemical properties are improved. As a result of a comparative assessment of the structures and electrochemical properties of the Na₃Fe₂(PO₄)₃ polycrystals, it was shown that samples of the second type have better cutting and higher densities and energy capacities than samples of the first type.

Recommended Citation

NOGAI, Adolf S.; NOGAI, Artur A.; USKENBAEV, Daniyar E.; NOGAI, Eleonora A.; and BUSH, Alexander A. (2024) "INFLUENCE OF SOLID-PHASE AND MELT SYNTHESIS METHODS ON THE STRUCTURE AND ELECTROCHEMICAL PROPERTIES OF Na3Fe2(PO4)3 POLYCRYSTALS," CHEMISTRY AND CHEMICAL ENGINEERING: Vol. 2024: No. 2, Article 4.
DOI: https://doi.org/10.34920/cce202424
Available at: https://cce.researchcommons.org/journal/vol2024/iss2/4