Svenja Senkale, Dr. Marius Kamp, Dr. Stefan Mangold, Dr. Sylvio Indris, Prof. Dr. Lorenz Kienle, Dr. Reinhard K. Kremer, Prof. Dr. Wolfgang Bensch
{"title":"高熵尖晶石氧化物Mn 0.2 Co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 fe2o的多方法表征:熵证据、微观结构和磁性能","authors":"Svenja Senkale, Dr. Marius Kamp, Dr. Stefan Mangold, Dr. Sylvio Indris, Prof. Dr. Lorenz Kienle, Dr. Reinhard K. Kremer, Prof. Dr. Wolfgang Bensch","doi":"10.1002/cmtd.202200043","DOIUrl":null,"url":null,"abstract":"<p>The novel spinel Cu<sub>0.2</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> comprising six transition metal cations was successfully prepared by a solution-combustion method followed by distinct thermal treatments. The entropic stabilization of this hexa-metallic material is demonstrated using in situ high temperature powder X-ray diffraction (PXRD) and directed removal of some of the constituting elements. Thorough evaluation of the PXRD data yields sizes of coherently scattering domains in the nanometre-range. Transmission electron microscopy based methods support this finding and indicate a homogeneous distribution of the elements in the samples. The combination of <sup>57</sup>Fe Mössbauer spectroscopy with X-ray absorption near edge spectroscopy allowed determination of the cation occupancy on the tetrahedral and octahedral sites in the cubic spinel structure. Magnetic studies show long-range magnetic exchange interactions which are of ferri- or ferromagnetic nature with an exceptionally high saturation magnetization in the range of 92–108 emu g<sup>−1</sup> at low temperature, but also an anomaly in the hysteresis of a sample calcined at 500 °C.</p>","PeriodicalId":72562,"journal":{"name":"Chemistry methods : new approaches to solving problems in chemistry","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202200043","citationCount":"0","resultStr":"{\"title\":\"Multi-Method Characterization of the High-Entropy Spinel Oxide Mn0.2Co0.2Ni0.2Cu0.2Zn0.2Fe2O4: Entropy Evidence, Microstructure, and Magnetic Properties\",\"authors\":\"Svenja Senkale, Dr. Marius Kamp, Dr. Stefan Mangold, Dr. Sylvio Indris, Prof. Dr. Lorenz Kienle, Dr. Reinhard K. Kremer, Prof. Dr. Wolfgang Bensch\",\"doi\":\"10.1002/cmtd.202200043\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The novel spinel Cu<sub>0.2</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub>Zn<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> comprising six transition metal cations was successfully prepared by a solution-combustion method followed by distinct thermal treatments. The entropic stabilization of this hexa-metallic material is demonstrated using in situ high temperature powder X-ray diffraction (PXRD) and directed removal of some of the constituting elements. Thorough evaluation of the PXRD data yields sizes of coherently scattering domains in the nanometre-range. Transmission electron microscopy based methods support this finding and indicate a homogeneous distribution of the elements in the samples. The combination of <sup>57</sup>Fe Mössbauer spectroscopy with X-ray absorption near edge spectroscopy allowed determination of the cation occupancy on the tetrahedral and octahedral sites in the cubic spinel structure. Magnetic studies show long-range magnetic exchange interactions which are of ferri- or ferromagnetic nature with an exceptionally high saturation magnetization in the range of 92–108 emu g<sup>−1</sup> at low temperature, but also an anomaly in the hysteresis of a sample calcined at 500 °C.</p>\",\"PeriodicalId\":72562,\"journal\":{\"name\":\"Chemistry methods : new approaches to solving problems in chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.1000,\"publicationDate\":\"2022-10-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cmtd.202200043\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemistry methods : new approaches to solving problems in chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/cmtd.202200043\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemistry methods : new approaches to solving problems in chemistry","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cmtd.202200043","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Multi-Method Characterization of the High-Entropy Spinel Oxide Mn0.2Co0.2Ni0.2Cu0.2Zn0.2Fe2O4: Entropy Evidence, Microstructure, and Magnetic Properties
The novel spinel Cu0.2Co0.2Mn0.2Ni0.2Zn0.2Fe2O4 comprising six transition metal cations was successfully prepared by a solution-combustion method followed by distinct thermal treatments. The entropic stabilization of this hexa-metallic material is demonstrated using in situ high temperature powder X-ray diffraction (PXRD) and directed removal of some of the constituting elements. Thorough evaluation of the PXRD data yields sizes of coherently scattering domains in the nanometre-range. Transmission electron microscopy based methods support this finding and indicate a homogeneous distribution of the elements in the samples. The combination of 57Fe Mössbauer spectroscopy with X-ray absorption near edge spectroscopy allowed determination of the cation occupancy on the tetrahedral and octahedral sites in the cubic spinel structure. Magnetic studies show long-range magnetic exchange interactions which are of ferri- or ferromagnetic nature with an exceptionally high saturation magnetization in the range of 92–108 emu g−1 at low temperature, but also an anomaly in the hysteresis of a sample calcined at 500 °C.