Multiorder and structural mechanism of the LiRh 2 O 4  tetragonal phase formation

M. V. Talanov; Таланов М. В.; V. B. Shirokov; Широков В. Б.; V. M. Talanov; Таланов В. М.; M. S. Aulov; Аулов М. С.

doi:10.31857/S0367676523702162

Multiorder and structural mechanism of the LiRh₂O₄ tetragonal phase formation

Authors: Talanov M.V.¹, Shirokov V.B.², Talanov V.M.³, Aulov M.S.³
Affiliations:
1. Southern Federal University
2. Southern Science Center of the Russian Academy of Sciences
3. Platov South-Russian State Polytechnic University
Issue: Vol 87, No 9 (2023)
Pages: 1222-1228
Section: Articles
URL: https://journal-vniispk.ru/0367-6765/article/view/135475
DOI: https://doi.org/10.31857/S0367676523702162
EDN: https://elibrary.ru/HSGGEH
ID: 135475

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Abstract
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Abstract

The results of the group-theoretical analysis of phase transitions in the LiRh₂O₄ are presented. It is found that the critical irreducible representation inducing phase transitions and multiorder in this substance is the eight-dimensional representation \(~{{k}_{{11}}}{{{\text{\tau }}}_{5}} + {{k}_{{10}}}{{{\text{\tau }}}_{2}}\). It is shown that the multiorder and the structural mechanism of formation of the tetragonal phase of lithium rhodonite are related to the displacements of oxygen atoms, the tilts of the [RhO]₆ octahedra, and the ordering of the rhodium t_2g orbitals.

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