Nanosized rare-earth hexaborides: Low-temperature preparation and microstructural analysis |
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| Institution: | 1. Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell''Insubria, via Valleggio 11, 22100 Como, Italy;2. Istituto di Cristallografia and To.Sca.Lab, Consiglio Nazionale delle Ricerche, via Lucini 3, 22100 Como, Italy;3. Edison SpA, Divisione Ricerca e Sviluppo, Foro Buonaparte 31, 20121 Milano, Italy;1. College of Mathematics and Physics, Jinggangshan University, Jian 343409, China;2. Shanghai Key Laboratory of Special Artificial Microstructure and Pohl Institute of Solid State Physics and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;3. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China;4. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;5. Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Hohhot 010022, China;1. Nanotechnology Department, School of Advanced Technologies, Iran University of Science & Technology (IUST), Narmak, Tehran, 16846-13114, Iran;2. Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Americo Vespucio 49, Sevilla, 41092, Spain;3. Department of Engineering and Mathematics, Sheffield Hallam University, Howard Street, S1 1WB, Sheffield, United Kingdom;1. Particulate Materials Laboratories (PML), Department of Metallurgical and Materials Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey;2. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450, USA;1. Dipartimento di Scienza e Alta Tecnologia and To.Sca.Lab, Università dell’Insubria, via Valleggio 11, 22100, Como, Italy;2. Dipartimento di Fisica e Chimica “Emilio Segrè”, Università di Palermo, viale delle Scienze, 90128, Palermo, Italy;1. Department of Inorganic Materials, Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovak Republic;2. RHP-Technology GmbH, Forschungs- und Technologiezentrum, A-2444, Seibersdorf, Austria;3. Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 13, Bratislava, Slovak Republic |
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| Abstract: | A versatile, rapid and easy synthesis of pure rare-earth-(RE) hexaboride powders was developed, without resorting to hazardous precursors or generating undesired, ineliminable, side products. To this purpose, we employed a metathesis reaction, typically starting from a mixture of a hydrated rare earth trichloride and MgB2, kept at 650 °C for 1 h under vacuum. This methodology affords nanosized RE hexaborides, with average crystallite (domain) sizes down to a few nanometers, useful for tailoring the functional performances of the MgB2 superconducting phase produced by the reactive liquid infiltration method. For the powders showing the lowest average domain sizes (YbB6 and EuB6), an unconventional microstructural analysis, based on Total Scattering methods and on the Debye Function Approach, was also performed, which provided the complete nanocrystal size distributions. |
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| Keywords: | Rare-earth boride X-ray diffraction Nanostructured materials Solid state reaction Total scattering techniques |
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