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Título: | Sol-gel synthesis control of iron-cobalt alloy/ferrite core/shell nanoparticles supported by a carbon medium with semi-hard magnetic features |
Autor: | Castellano-Soria, Alberto; López-Sánchez, Jesús CSIC ORCID; Serrano Rubio, Aída CSIC ORCID ; Gorni, Giulio; Varela, María; Sardinero, Ignacio; Carmona, Noemí; Hernando, Antonio CSIC ORCID; Marín, Pilar CSIC ORCID; Navarro, Elena | Palabras clave: | Core/shell nanostructures Fe-Co alloy Nanoparticles Sol-gel Spring-exchange Semi-hard magnetic properties |
Fecha de publicación: | 10-oct-2023 | Editor: | Elsevier | Citación: | Journal of Alloys and Compounds 959: 170244 (2023) | Resumen: | We explore a simple and optimized approach for obtaining magnetic nanoparticle-carbon composites by a novel one-pot sol-gel method. In them, various metal cations ratios of Fe3+ and Co2+ are evaluated. The ratio of Fe:Co is a critical parameter that governs the presence of different crystalline phases with tailored magnetic properties. Interestingly, the smallest introduction of Co into the synthesis (19Fe:1Co) provides an abrupt emergence of the body-centered cubic (bcc) Fe-Co alloy, instead of the orthorhombic Pnma structure characteristic of the Fe3C intermetallic compound (1Fe:0Co). Advanced structural and electronic characterizations reveal the formation of Fe-Co/Co-ferrite core/shell nanoparticle structures embedded in a carbon matrix. The sphere-like nanoparticles range from 10 to 45 nm and the shells show a spinel structure with a thickness of 2–3 nm. In addition, X-ray absorption spectroscopy unveils that the oxidation state of Fe and Co cations is close to zero, demonstrating their predominant metallic character. The magnetic properties can be modulated by a precise control of the alloy composition varying the Co content, displaying saturation magnetization values close to ∼137 emu/g. The nanoparticles are mainly single magnetic domain with a considerable coercive field (∼450 Oe), higher than those reported in the literature for Fe-Co nanoparticles. This semi-hard character is due to a notable spring exchange effect emerged by passivating the surface of Fe-Co-bcc cores with a thin Co-ferrite-like shell. | Descripción: | 12 pags., 7 figs., 3 tabs. | Versión del editor: | https://doi.org/10.1016/j.jallcom.2023.170244 | URI: | http://hdl.handle.net/10261/336833 | DOI: | 10.1016/j.jallcom.2023.170244 | ISSN: | 0925-8388 |
Aparece en las colecciones: | (CFMAC-IO) Artículos (ICV) Artículos (ICMM) Artículos |
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Fichero | Descripción | Tamaño | Formato | |
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jac_Castellano_et_al (2023).pdf | Artículo principal | 7,35 MB | Adobe PDF | Visualizar/Abrir |
Supporting Information.pdf | Supporting information | 455,89 kB | Adobe PDF | Visualizar/Abrir |
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