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Metal-oxide interfaces: In-situ functional nanocomposites

AuthorsFernández Lozano, José Francisco ; Campo, Ángel Adolfo del ; Quesada, Adrián ; Rull Bravo, Marta ; Martín-González, Marisol; Moure Arroyo, Alberto
Issue Date7-Jun-2017
CitationVI Congreso de Pulvimetalurgia. I Congreso Iberoamericano de Pulvimetalurgia (2017)
AbstractThere are different examples of how new and surprising functional properties are produced by the control of interfaces between different materials at the nanoscale. The existence of interfaces in nanocomposite materials allows also engineering materials properties with surprising performances. However, moving these nanotechnology advances to massive or industrial applications finds technological barriers that are insurmountable in many cases. We performed an innovative synthesis of metal/oxide nanocomposites in air by high energy milling where functional interfaces are in situ developed. This methodology opens up new possibilities for the facile, large scale synthesis of metal base nanomaterials. Two main examples are summarized marking down costs of fabrication and maximizing performance:  Magnetic alloys: FeCo mechanically alloyed in air produces nanomaterials with nearly identical magnetic performance as their argon-milled counterpart. The oxidation extent of the materials consisting almost exclusively of the thin oxide passivating layer located at the surface kept the saturation magnetization up to 6 months in environmental conditions.  Thermoelectric nanocomposites: Well performing CoSb3/oxide thermoelectric materials for medium range temperatures applications are produced through high energy milling in air and Spark plasma sintering having Figures of Merit >1. A confocal Raman Microscopy study evidences unequivocally the appearance of a space charge layer at the metal/oxide interfaces characterized by a crystal lattice softening and a surprising enhanced Raman signal. The functional interfaces act as highly effective phonon scattering and trapping centers that highly reduce the thermal conductivity, while a high electrical conductivity is achieved by selective doping the metal phase.
DescriptionTrabajo presentado en el VI Congreso de Pulvimetalurgia. I Congreso Iberoamericano de Pulvimetalurgia, celebrado en Ciudad Real (España), del 7 al 9 de junio de 2017
Appears in Collections:(ICV) Comunicaciones congresos
(IMN-CNM) Comunicaciones congresos
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