Preparation and Characterization of a High-Entropy Magnet, (Mg, Mn, Co, Ni, Cu) 3 TeO 6

We report on the synthesis of Mg Mn Co Ni Cu TeO , which is isostructural with multiferroic Mn TeO (space group ). Study of its magnetic properties indicates establishment of the long-range antiferromagnetic order at 16.3 K, slightly lower than that of pure Mn TeO . The tiny hysteresis of magnetizat...

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Published in:Inorganic chemistry 2024-11, Vol.63 (47), p.22372-22378
Main Authors: Nalbandyan, Vladimir B, Zakharov, Konstantin V, Evstigneeva, Maria A, Vasiliev, Alexander N, Sheptun, Ivan G, Shvanskaya, Larisa V, Vasilchikova, Tatyana M
Format: Article
Language:English
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Summary:We report on the synthesis of Mg Mn Co Ni Cu TeO , which is isostructural with multiferroic Mn TeO (space group ). Study of its magnetic properties indicates establishment of the long-range antiferromagnetic order at 16.3 K, slightly lower than that of pure Mn TeO . The tiny hysteresis of magnetization loop along with specific heat data implies the presence of ferromagnetic magnons at low temperatures. Dielectric measurements reveal sequence of well-defined steps in the real part of permittivity and peaks in the imaginary parts of permittivity at 30, 92, and 212 K attributable to the highly diffused structural changes, which are characteristic to relaxor ferroelectrics. It is shown that usual interpretation of this structure type as corundum-related is not accurate: the hexagonal oxygen packing is not close and is not double-layered. Therefore, Mn TeO represents a very special structure type.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.4c02809