@ARTICLE{Arzac201446576,
author={Arzac, G.M.a  and Rojas, T.C.a  and Gontard, L.C.a  and Chinchilla, L.E.b  and Otal, E.c  d  and Crespo, P.e  f  and Fernández, A.a },
title={Chemistry, nanostructure and magnetic properties of Co-Ru-B-O nanoalloys},
journal={RSC Advances},
year={2014},
volume={4},
number={87},
pages={46576-46586},
doi={10.1039/c4ra05700g},
note={cited By 0},
url={https://www.scopus.com/inward/record.url?eid=2-s2.0-84907646282&partnerID=40&md5=46295160a43916a270a0ba3fe6466c49},
affiliation={Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla), Avda. Américo Vespucio 49, Sevilla, Spain; Departamento de Ciencia de Materiales, Facultad de Ciencias, Universidad de Cádiz, Puerto Real Cádiz, Spain; Division of Porous Materials, UNIDEF, CONICET, S. J. B de la Salle 4397, Villa Martelli, Buenos Aires, Argentina; Laboratory for Materials Science and Technology, FRSC-UTN, Av. Inmigrantes 555, Río-Gallegos, Argentina; Instituto de Magnetismo Aplicado (RENFE-UCM-CSIC), P.O. Box 155, Las Rozas, Madrid, Spain; Departamento de Física de Materiales, Universidad Complutense, Madrid, Spain},
abstract={In our previous works, Co-B-O and Co-Ru-B-O ultrafine powders with variable Ru content (x<inf>Ru</inf>) were studied as catalysts for hydrogen generation through sodium borohydride hydrolysis. These materials have shown a complex nanostructure in which small Co-Ru metallic nanoparticles are embedded in an amorphous matrix formed by Co-Ru-B-O based phases and B<inf>2</inf>O<inf>3</inf>. Catalytic activity was correlated to nanostructure, surface and bulk composition. However, some questions related to these materials remain unanswered and are studied in this work. Aspects such as: 3D morphology, metal nanoparticle size, chemical and electronic information on the nanoscale (composition and oxidation states), and the study of the formation or not of a Co<inf>x</inf>Ru<inf>1-x</inf> alloy or solid solution are investigated and discussed using XAS (X-ray Absorption Spectroscopy) and Scanning Transmission Electron Microscopy (STEM) techniques. Also magnetic behavior of the series is studied for the first time and the structure-performance relationships discussed. All Co-containing samples exhibited ferromagnetic behavior up to room temperature while the Ru-B-O sample is diamagnetic. For the x<inf>Ru</inf> = 0.13 sample, an enhancement in the H<inf>c</inf> (coercitive field) and M<inf>s</inf> (saturation magnetization) is produced with respect to the monometallic Co-B-O material. However this effect is not observed for samples with higher Ru content. The presence of the Co<inf>x</inf>B-rich (cobalt boride) amorphous ferromagnetic matrix, very small metal nanoparticles (Co and Co<inf>x</inf>Ru<inf>(1-x)</inf>) embedded in the matrix, and the antiferromagnetic CoO phase (for the higher Ru content sample, x<inf>Ru</inf> = 0.7), explain the magnetic behavior of the series. © the Partner Organisations 2014.},
document_type={Article},
source={Scopus},
}

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Sevilla), Avda. Américo Vespucio 49, Sevilla, Spain; Departamento de Ciencia de Materiales, Facultad de Ciencias, Universidad de Cádiz, Puerto Real Cádiz, Spain; Division of Porous Materials, UNIDEF, CONICET, S. J. B de la Salle 4397, Villa Martelli, Buenos Aires, Argentina; Laboratory for Materials Science and Technology, FRSC-UTN, Av. Inmigrantes 555, Río-Gallegos, Argentina; Instituto de Magnetismo Aplicado (RENFE-UCM-CSIC), P.O. Box 155, Las Rozas, Madrid, Spain; Departamento de Física de Materiales, Universidad Complutense, Madrid, Spain","abstract":"In our previous works, Co-B-O and Co-Ru-B-O ultrafine powders with variable Ru content (x<inf>Ru</inf>) were studied as catalysts for hydrogen generation through sodium borohydride hydrolysis. These materials have shown a complex nanostructure in which small Co-Ru metallic nanoparticles are embedded in an amorphous matrix formed by Co-Ru-B-O based phases and B<inf>2</inf>O<inf>3</inf>. Catalytic activity was correlated to nanostructure, surface and bulk composition. However, some questions related to these materials remain unanswered and are studied in this work. Aspects such as: 3D morphology, metal nanoparticle size, chemical and electronic information on the nanoscale (composition and oxidation states), and the study of the formation or not of a Co<inf>x</inf>Ru<inf>1-x</inf> alloy or solid solution are investigated and discussed using XAS (X-ray Absorption Spectroscopy) and Scanning Transmission Electron Microscopy (STEM) techniques. Also magnetic behavior of the series is studied for the first time and the structure-performance relationships discussed. All Co-containing samples exhibited ferromagnetic behavior up to room temperature while the Ru-B-O sample is diamagnetic. For the x<inf>Ru</inf> = 0.13 sample, an enhancement in the H<inf>c</inf> (coercitive field) and M<inf>s</inf> (saturation magnetization) is produced with respect to the monometallic Co-B-O material. However this effect is not observed for samples with higher Ru content. The presence of the Co<inf>x</inf>B-rich (cobalt boride) amorphous ferromagnetic matrix, very small metal nanoparticles (Co and Co<inf>x</inf>Ru<inf>(1-x)</inf>) embedded in the matrix, and the antiferromagnetic CoO phase (for the higher Ru content sample, x<inf>Ru</inf> = 0.7), explain the magnetic behavior of the series. © the Partner Organisations 2014.","document_type":"Article","source":"Scopus","bibtex":"@ARTICLE{Arzac201446576,\r\nauthor={Arzac, G.M.a and Rojas, T.C.a and Gontard, L.C.a and Chinchilla, L.E.b and Otal, E.c d and Crespo, P.e f and Fernández, A.a },\r\ntitle={Chemistry, nanostructure and magnetic properties of Co-Ru-B-O nanoalloys},\r\njournal={RSC Advances},\r\nyear={2014},\r\nvolume={4},\r\nnumber={87},\r\npages={46576-46586},\r\ndoi={10.1039/c4ra05700g},\r\nnote={cited By 0},\r\nurl={https://www.scopus.com/inward/record.url?eid=2-s2.0-84907646282&partnerID=40&md5=46295160a43916a270a0ba3fe6466c49},\r\naffiliation={Instituto de Ciencia de Materiales de Sevilla (CSIC-Univ. Sevilla), Avda. Américo Vespucio 49, Sevilla, Spain; Departamento de Ciencia de Materiales, Facultad de Ciencias, Universidad de Cádiz, Puerto Real Cádiz, Spain; Division of Porous Materials, UNIDEF, CONICET, S. J. B de la Salle 4397, Villa Martelli, Buenos Aires, Argentina; Laboratory for Materials Science and Technology, FRSC-UTN, Av. Inmigrantes 555, Río-Gallegos, Argentina; Instituto de Magnetismo Aplicado (RENFE-UCM-CSIC), P.O. Box 155, Las Rozas, Madrid, Spain; Departamento de Física de Materiales, Universidad Complutense, Madrid, Spain},\r\nabstract={In our previous works, Co-B-O and Co-Ru-B-O ultrafine powders with variable Ru content (x<inf>Ru</inf>) were studied as catalysts for hydrogen generation through sodium borohydride hydrolysis. These materials have shown a complex nanostructure in which small Co-Ru metallic nanoparticles are embedded in an amorphous matrix formed by Co-Ru-B-O based phases and B<inf>2</inf>O<inf>3</inf>. Catalytic activity was correlated to nanostructure, surface and bulk composition. However, some questions related to these materials remain unanswered and are studied in this work. Aspects such as: 3D morphology, metal nanoparticle size, chemical and electronic information on the nanoscale (composition and oxidation states), and the study of the formation or not of a Co<inf>x</inf>Ru<inf>1-x</inf> alloy or solid solution are investigated and discussed using XAS (X-ray Absorption Spectroscopy) and Scanning Transmission Electron Microscopy (STEM) techniques. Also magnetic behavior of the series is studied for the first time and the structure-performance relationships discussed. All Co-containing samples exhibited ferromagnetic behavior up to room temperature while the Ru-B-O sample is diamagnetic. For the x<inf>Ru</inf> = 0.13 sample, an enhancement in the H<inf>c</inf> (coercitive field) and M<inf>s</inf> (saturation magnetization) is produced with respect to the monometallic Co-B-O material. However this effect is not observed for samples with higher Ru content. 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