Аннотация
I have to inform you that in slV article a comparative evaluation of the influence of solid-phase and melt-hardening methods of synthesis on the structures and electrochemical properties of Na3Fe2(PO4)3 polycrystals is given. Solid-phase synthesis of Na3Fe2(PO4)3 polycrystals (1 type of samples) is carried out by two-stage method according to ceramic technology. In case of the melt-hardening method of synthesis, firstly glassy precursors are obtained by melting of initial materials under the influence of IR radiation energy, and after their grinding, pressing and firing polycrystals of Na3Fe2(PO4)3 (2nd type of samples) are obtained. In the melt-hardening method, the precursors are obtained under sharply temperature-gradient conditions, and the synthesis of polycrystals occurs rapidly, so the resulting compressive strains partially reduce the monoclinic distortions of α-Na3Fe2(PO4)3 structures. Due to the higher symmetrization of the crystal structure of α-Na3Fe2(PO4)3 and the higher density of type 2 samples, their cathodic electrochemical properties are significantly higher compared to type 1 samples. A evaluation comparative of the structures and electrochemical properties of Na3Fe2(PO4)3 polycrystals shows that type 2 samples have better faceting and higher densities and energy capacities than type 1 samples. If our common project is approved, you will carry out your part of the project with your collaborators and your team will be allocated a part of the grant money. If the project program includes three separate topics, the total grant will be divided into three parts.