{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T01:12:48Z","timestamp":1760058768661,"version":"build-2065373602"},"reference-count":25,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T00:00:00Z","timestamp":1745452800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["24-73-10007"],"award-info":[{"award-number":["24-73-10007"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Layered chalcogenides are interesting from the point of view of the formation of two-dimensional magnetic systems for relevant applications in spintronics. High-spin Mn2+ or Fe3+ 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 Mn2In2Se5 compound from the A2B2X5 family (\u201c225\u201d) was synthesized and investigated. A phase transition to the polymorph with primitive trigonal lattice was recorded at a temperature of 711 \u00b0C, which was confirmed by simultaneous thermal analysis, X-ray powder diffraction at elevated temperatures, and sample annealing and quenching. The stability of Mn2In2Se5 in air at high temperatures was investigated by thermal gravimetric analysis and powder X-ray diffraction. The new polymorph of Mn2In2Se5 crystallizes in the Mg2Al2Se5 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 AMnBInCBInCMnA\u2026 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\u2013Weiss law yields a significant ratio of |\u03b8|\/TN = 28, which indicates strong magnetic frustration.<\/jats:p>","DOI":"10.3390\/molecules30091904","type":"journal-article","created":{"date-parts":[[2025,4,24]],"date-time":"2025-04-24T11:44:52Z","timestamp":1745495092000},"page":"1904","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High-Temperature Layered Modification of Mn2In2Se5"],"prefix":"10.3390","volume":"30","author":[{"given":"Ivan V.","family":"Chernoukhov","sequence":"first","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anton D.","family":"Pyreu","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3497-8448","authenticated-orcid":false,"given":"Andrey N.","family":"Azarevich","sequence":"additional","affiliation":[{"name":"Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5633-7778","authenticated-orcid":false,"given":"Alexander N.","family":"Samarin","sequence":"additional","affiliation":[{"name":"Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexey V.","family":"Bogach","sequence":"additional","affiliation":[{"name":"Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Konstantin O.","family":"Znamenkov","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8316-3280","authenticated-orcid":false,"given":"Andrei V.","family":"Shevelkov","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8000-425X","authenticated-orcid":false,"given":"Valeriy Yu.","family":"Verchenko","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"11803","DOI":"10.1021\/acsnano.7b07436","article-title":"Van der Waals Layered Materials: Opportunities and Challenges","volume":"11","author":"Duong","year":"2017","journal-title":"ACS Nano"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"220501","DOI":"10.1063\/5.0130037","article-title":"Two-dimensional ferromagnetic materials: From materials to devices","volume":"121","author":"Wang","year":"2022","journal-title":"Appl. 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