Maurice Conrad, Sebastian Bette, Robert E. Dinnebier, Thomas Schleid
{"title":"论珀尔铼酸锶 Sr[ReO4]2 的热二态性","authors":"Maurice Conrad, Sebastian Bette, Robert E. Dinnebier, Thomas Schleid","doi":"10.1002/zaac.202400045","DOIUrl":null,"url":null,"abstract":"Hygroscopic single crystals of a new hexagonal high‐temperature modification of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> were prepared from a melt of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> ⋅ H<jats:sub>2</jats:sub>O and SrCl<jats:sub>2</jats:sub> ⋅ 6 H<jats:sub>2</jats:sub>O. The structure analysis of the obtained crystals by X‐ray diffraction revealed that the title compound crystallizes in the ThCd[MoO<jats:sub>4</jats:sub>]<jats:sub>3</jats:sub>‐type structure with the hexagonal space group <jats:italic>P</jats:italic>6<jats:sub>3</jats:sub>/<jats:italic>m</jats:italic> and the lattice parameters <jats:italic>a</jats:italic>=1023.81(7) pm and <jats:italic>c</jats:italic>=646.92(4) pm (<jats:italic>c</jats:italic>/<jats:italic>a</jats:italic>=0.632) for <jats:italic>Z</jats:italic>=2 in its quenchable high‐temperature form. Two crystallographically independent Sr<jats:sup>2+</jats:sup> cations are coordinated by oxygen atoms forming either octahedra or tricapped trigonal prisms, whereas the Re<jats:sup>7+</jats:sup> cations are found in the centers of discrete tetrahedral <jats:italic>meta</jats:italic>‐perrhenate units [ReO<jats:sub>4</jats:sub>]<jats:sup>−</jats:sup>. Temperature‐dependent <jats:italic>in‐situ</jats:italic> PXRD studies of dry powder samples of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> exhibited its thermal dimorphy with a phase‐transition temperature at 500–550 °C from literature‐known m‐Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> into the newly discovered h‐Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> (hexagonal).","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"35 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"On the Thermal Dimorphy of the Strontium Perrhenate Sr[ReO4]2\",\"authors\":\"Maurice Conrad, Sebastian Bette, Robert E. Dinnebier, Thomas Schleid\",\"doi\":\"10.1002/zaac.202400045\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Hygroscopic single crystals of a new hexagonal high‐temperature modification of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> were prepared from a melt of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> ⋅ H<jats:sub>2</jats:sub>O and SrCl<jats:sub>2</jats:sub> ⋅ 6 H<jats:sub>2</jats:sub>O. The structure analysis of the obtained crystals by X‐ray diffraction revealed that the title compound crystallizes in the ThCd[MoO<jats:sub>4</jats:sub>]<jats:sub>3</jats:sub>‐type structure with the hexagonal space group <jats:italic>P</jats:italic>6<jats:sub>3</jats:sub>/<jats:italic>m</jats:italic> and the lattice parameters <jats:italic>a</jats:italic>=1023.81(7) pm and <jats:italic>c</jats:italic>=646.92(4) pm (<jats:italic>c</jats:italic>/<jats:italic>a</jats:italic>=0.632) for <jats:italic>Z</jats:italic>=2 in its quenchable high‐temperature form. Two crystallographically independent Sr<jats:sup>2+</jats:sup> cations are coordinated by oxygen atoms forming either octahedra or tricapped trigonal prisms, whereas the Re<jats:sup>7+</jats:sup> cations are found in the centers of discrete tetrahedral <jats:italic>meta</jats:italic>‐perrhenate units [ReO<jats:sub>4</jats:sub>]<jats:sup>−</jats:sup>. Temperature‐dependent <jats:italic>in‐situ</jats:italic> PXRD studies of dry powder samples of Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> exhibited its thermal dimorphy with a phase‐transition temperature at 500–550 °C from literature‐known m‐Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> into the newly discovered h‐Sr[ReO<jats:sub>4</jats:sub>]<jats:sub>2</jats:sub> (hexagonal).\",\"PeriodicalId\":23934,\"journal\":{\"name\":\"Zeitschrift für anorganische und allgemeine Chemie\",\"volume\":\"35 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Zeitschrift für anorganische und allgemeine Chemie\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1002/zaac.202400045\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift für anorganische und allgemeine Chemie","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/zaac.202400045","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
On the Thermal Dimorphy of the Strontium Perrhenate Sr[ReO4]2
Hygroscopic single crystals of a new hexagonal high‐temperature modification of Sr[ReO4]2 were prepared from a melt of Sr[ReO4]2 ⋅ H2O and SrCl2 ⋅ 6 H2O. The structure analysis of the obtained crystals by X‐ray diffraction revealed that the title compound crystallizes in the ThCd[MoO4]3‐type structure with the hexagonal space group P63/m and the lattice parameters a=1023.81(7) pm and c=646.92(4) pm (c/a=0.632) for Z=2 in its quenchable high‐temperature form. Two crystallographically independent Sr2+ cations are coordinated by oxygen atoms forming either octahedra or tricapped trigonal prisms, whereas the Re7+ cations are found in the centers of discrete tetrahedral meta‐perrhenate units [ReO4]−. Temperature‐dependent in‐situ PXRD studies of dry powder samples of Sr[ReO4]2 exhibited its thermal dimorphy with a phase‐transition temperature at 500–550 °C from literature‐known m‐Sr[ReO4]2 into the newly discovered h‐Sr[ReO4]2 (hexagonal).
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