Mechanochemical synthesis of a La0.67Ce0.21Nd 0.08Pr0.04Ni5 intermetallic compound
The mechanochemical synthesis of a La<inf>0.67</inf>Ce <inf>0.21</inf>Nd<inf>0.08</inf>Pr<inf>0.04</inf>Ni<inf>5</inf> intermetallic is studied. The intermetallic is synthesised from a mixture of LaNi<inf>5</inf> and La<inf&g...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/414316 |
| Acceso en línea: | http://hdl.handle.net/10261/414316 https://api.elsevier.com/content/abstract/scopus_id/84870489170 |
| Access Level: | acceso abierto |
| Palabra clave: | Mechanical alloying Mechanical milling Powder metallurgy XRD |
| Sumario: | The mechanochemical synthesis of a La<inf>0.67</inf>Ce <inf>0.21</inf>Nd<inf>0.08</inf>Pr<inf>0.04</inf>Ni<inf>5</inf> intermetallic is studied. The intermetallic is synthesised from a mixture of LaNi<inf>5</inf> and La<inf>0.25</inf>Ce<inf>0.52</inf>Nd<inf>0.17</inf>Pr<inf>0.06</inf>Ni <inf>5</inf>. The processes controlling the mechanical alloying are characterised as a function of integrated milling time (t<inf>m</inf>). Effects of fracture and cold welding on the sample are identified by scanning electron microscopy. Compositional, microstructural and structural changes are analysed by energy dispersive spectroscopy and X-ray diffraction. The powder obtained has a particle size distribution of 9 ± 1 μm with an average crystallite size of 370 ± 10 Å and strain >10%. The intermetallic compound is annealed in Ar to increase crystallite size and to release strain. The structure is refined by the Rietveld method. Cell parameters are a = 4.982(2) Å and c = 3.980(9) Å, respectively. The advantage of the synthesis method using intermetallics instead of metals/alloys is discussed along with the characteristics of the powder obtained. © 2012 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder. |
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