Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/jspui/handle/123456789/28979
Title: Preparation and Characterization of FeAg Granular Alloys
Authors: Araújo, José Humberto de
Soares, J. M.
Cabral, F. A. O.
Costa, J. A. P. da
Sasaki, M.
Keywords: Sol-gel;Granular alloy;Ferromagnetism
Issue Date: 2004
Publisher: Materials Research
Citation: ARAUJO, Jose Humberto de et al. Preparation and Characterization of FeAg Granular Alloys. Materials Research, Brazil, v. 7, n.3, p. 513-516, 2004. Disponivel em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000300022&lng=en&tlng=en. Acesso em: 15 maio 2020. https://doi.org/10.1590/S1516-14392004000300022.
Portuguese Abstract: Fe10Ag90 granular alloys have been fabricated, using a sol-gel method, for a range of nitric acid concentrations in the start solution. The samples have been characterized by X-ray diffraction and magnetization measurements. The average Fe particle sizes derived from X-ray diffraction are in the range 24-29 nm, indicating a large variation. The coercivity obtained from the hysteresis curve is two orders of magnitude larger that of pure iron in all the samples. Moreover, the hysteresis curves do not saturate, even in fields of up to 1 T. These observations indicate that the samples contain both superparamagnetic and blocked particles. A comparison between the coercive field and the average particle diameter, determined by the Sherrer's formula, is displayed in all acid concentrations.
Abstract: Fe10Ag90 granular alloys have been fabricated, using a sol-gel method, for a range of nitric acid concentrations in the start solution. The samples have been characterized by X-ray diffraction and magnetization measurements. The average Fe particle sizes derived from X-ray diffraction are in the range 24-29 nm, indicating a large variation. The coercivity obtained from the hysteresis curve is two orders of magnitude larger that of pure iron in all the samples. Moreover, the hysteresis curves do not saturate, even in fields of up to 1 T. These observations indicate that the samples contain both superparamagnetic and blocked particles. A comparison between the coercive field and the average particle diameter, determined by the Sherrer's formula, is displayed in all acid concentrations.
URI: https://repositorio.ufrn.br/jspui/handle/123456789/28979
ISSN: 1516-1439 (online), 1980-5373 (print)
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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