Magnetic characterization of Fe, Ni, Co nanoparticles dispersed in phyllosilicate type silicon oxideReportar como inadecuado




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1 Lab. de Magnetismo 2 ISCR - Institut des Sciences Chimiques de Rennes 3 Instituto de Nanociencia 4 Lab. de Cinética y Catálisis

Abstract : We present the magnetic properties of silica-supported metal Fe,catalyst nanoparticles synthesized by precipitation of metal nitrate in ammonia-based medium. Our goal is the study of possible metal-support interactions in the nanoporous catalyst. The temperature dependence of the magnetization for all samples display spin-glass like behavior below c.a. 11-12 K, with clear Curie-Weiss dependence in the high-temperature regime. Spin-glass-like behavior was inferred from dynamic AC susceptibility data after analyzing the frequency-dependence of the in-phase component χ-f by the expression W = ΔTf-Tf Δlogf = 3.0 × 10−3. We found that the magnetic behavior of the catalyst is drastically affected by the existence of interactions between the metal and the support.

Keywords : Condensed matter: electrical magnetic and optical anoscale science and low-D systems





Autor: V. Sagredo - Octavio Peña - T.-E. Torres - A. Loaiza-Gil - M. Villarroel - M. De La Cruz - J. Balbuena -

Fuente: https://hal.archives-ouvertes.fr/



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