High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub>
Layered chalcogenides are interesting from the point of view of the formation of two-dimensional magnetic systems for relevant applications in spintronics. High-spin Mn<sup>2+</sup> or Fe<sup>3+</sup> cations with five unpaired electrons are promising in the search for compou...
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2025-04-01
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| author | Ivan V. Chernoukhov Anton D. Pyreu Andrey N. Azarevich Alexander N. Samarin Alexey V. Bogach Konstantin O. Znamenkov Andrei V. Shevelkov Valeriy Yu. Verchenko |
| author_facet | Ivan V. Chernoukhov Anton D. Pyreu Andrey N. Azarevich Alexander N. Samarin Alexey V. Bogach Konstantin O. Znamenkov Andrei V. Shevelkov Valeriy Yu. Verchenko |
| author_sort | Ivan V. Chernoukhov |
| collection | DOAJ |
| description | Layered chalcogenides are interesting from the point of view of the formation of two-dimensional magnetic systems for relevant applications in spintronics. High-spin Mn<sup>2+</sup> or Fe<sup>3+</sup> cations with five unpaired electrons are promising in the search for compounds with interesting magnetic properties. In this study, a new layered modification of the Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> compound from the A<sub>2</sub>B<sub>2</sub>X<sub>5</sub> family (“225”) was synthesized and investigated. A phase transition to the polymorph with primitive trigonal lattice was recorded at a temperature of 711 °C, which was confirmed by simultaneous thermal analysis, X-ray powder diffraction at elevated temperatures, and sample annealing and quenching. The stability of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> in air at high temperatures was investigated by thermal gravimetric analysis and powder X-ray diffraction. The new polymorph of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> crystallizes in the Mg<sub>2</sub>Al<sub>2</sub>Se<sub>5</sub> structure type, as revealed by the Rietveld refinement against powder X-ray diffraction data. The crystal structure can be viewed as a close-packing of Se anions, in which indium and manganese cations are enclosed inside tetrahedral and octahedral voids, respectively, according to the <i>A</i><sub>Mn</sub><i>B</i><sub>In</sub><i>CB</i><sub>In</sub><i>C</i><sub>Mn</sub><i>A</i>… sequence. Magnetization measurements reveal an antiferromagnetic-like transition at a temperature of 6.3 K. The same magnetic properties are reported in the literature for the low-temperature R-centered trigonal polymorph. An approximation by the modified Curie–Weiss law yields a significant ratio of |<i>θ</i>|/<i>T</i><sub>N</sub> = 28, which indicates strong magnetic frustration. |
| format | Article |
| id | doaj-art-eabc79d401884b74a689291ec16f2e56 |
| institution | DOAJ |
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| publishDate | 2025-04-01 |
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| spelling | doaj-art-eabc79d401884b74a689291ec16f2e562025-08-20T02:59:14ZengMDPI AGMolecules1420-30492025-04-01309190410.3390/molecules30091904High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub>Ivan V. Chernoukhov0Anton D. Pyreu1Andrey N. Azarevich2Alexander N. Samarin3Alexey V. Bogach4Konstantin O. Znamenkov5Andrei V. Shevelkov6Valeriy Yu. Verchenko7Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, Lomonosov Moscow State University, 119991 Moscow, RussiaProkhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, RussiaProkhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, RussiaProkhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, RussiaDepartment of Chemistry, Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, Lomonosov Moscow State University, 119991 Moscow, RussiaLayered chalcogenides are interesting from the point of view of the formation of two-dimensional magnetic systems for relevant applications in spintronics. High-spin Mn<sup>2+</sup> or Fe<sup>3+</sup> cations with five unpaired electrons are promising in the search for compounds with interesting magnetic properties. In this study, a new layered modification of the Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> compound from the A<sub>2</sub>B<sub>2</sub>X<sub>5</sub> family (“225”) was synthesized and investigated. A phase transition to the polymorph with primitive trigonal lattice was recorded at a temperature of 711 °C, which was confirmed by simultaneous thermal analysis, X-ray powder diffraction at elevated temperatures, and sample annealing and quenching. The stability of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> in air at high temperatures was investigated by thermal gravimetric analysis and powder X-ray diffraction. The new polymorph of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> crystallizes in the Mg<sub>2</sub>Al<sub>2</sub>Se<sub>5</sub> structure type, as revealed by the Rietveld refinement against powder X-ray diffraction data. The crystal structure can be viewed as a close-packing of Se anions, in which indium and manganese cations are enclosed inside tetrahedral and octahedral voids, respectively, according to the <i>A</i><sub>Mn</sub><i>B</i><sub>In</sub><i>CB</i><sub>In</sub><i>C</i><sub>Mn</sub><i>A</i>… sequence. Magnetization measurements reveal an antiferromagnetic-like transition at a temperature of 6.3 K. The same magnetic properties are reported in the literature for the low-temperature R-centered trigonal polymorph. An approximation by the modified Curie–Weiss law yields a significant ratio of |<i>θ</i>|/<i>T</i><sub>N</sub> = 28, which indicates strong magnetic frustration.https://www.mdpi.com/1420-3049/30/9/1904vdW-chalcogenideslayered selenides“225” familyfrustrated system |
| spellingShingle | Ivan V. Chernoukhov Anton D. Pyreu Andrey N. Azarevich Alexander N. Samarin Alexey V. Bogach Konstantin O. Znamenkov Andrei V. Shevelkov Valeriy Yu. Verchenko High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> Molecules vdW-chalcogenides layered selenides “225” family frustrated system |
| title | High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> |
| title_full | High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> |
| title_fullStr | High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> |
| title_full_unstemmed | High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> |
| title_short | High-Temperature Layered Modification of Mn<sub>2</sub>In<sub>2</sub>Se<sub>5</sub> |
| title_sort | high temperature layered modification of mn sub 2 sub in sub 2 sub se sub 5 sub |
| topic | vdW-chalcogenides layered selenides “225” family frustrated system |
| url | https://www.mdpi.com/1420-3049/30/9/1904 |
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