Discovery and implications of hidden atomic-scale structure in a metallic meteorite
| Autor: | Andras Kovacs, Laura H. Lewis, Dhanalaksmi Palanisamy, Thibaud Denneulin, Alexander Schwedt, Edward R.D. Scott, Baptiste Gault, Dierk Raabe, Rafal Dunin-Borkowski, Michalis Charilaou |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Nano letters 21(19), 8135–8142 (2021). doi:10.1021/acs.nanolett.1c02573 |
| DOI: | 10.48550/arxiv.2107.07909 |
| Popis: | Iron and its alloys have made modern civilisation possible, with metallic meteorites providing one of the human's earliest sources of usable iron as well as providing a window into our solar system's billion-year history. Here highest-resolution tools reveal the existence of a previously hidden FeNi nanophase within the extremely slowly cooled metallic meteorite NWA 6259. This new nanophase exists alongside Ni-poor and Ni-rich nanoprecipitates within a matrix of tetrataenite, the uniaxial, chemically ordered form of FeNi. The ferromagnetic nature of the nanoprecipitates combined with the antiferromagnetic character of the FeNi nanophases give rise to a complex magnetic state that evolves dramatically with temperature. These observations extend and possibly alter our understanding of celestial metallurgy, provide new knowledge concerning the archetypal Fe-Ni phase diagram and supply new information for the development of new types of sustainable, technologically critical high-energy magnets. Comment: 10 pages, 5 figures |
| Databáze: | OpenAIRE |
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