Please use this identifier to cite or link to this item: https://repositorio.ufrn.br/jspui/handle/123456789/28984
Title: Magnetic Properties of the Granular Alloy Fe10Ag90 as a Function of Annealing Temperature
Authors: Araújo, José Humberto de
Soares, João Maria
Cabral, Francisco de Assis Olímpio
Dumelow, Thomas
Xavier Júnior, Milton Morais
Sasaki, José Marcos
Keywords: Superparamagnetism;Granular alloy;Size distribution
Issue Date: Sep-2005
Publisher: Materials Research
Citation: ARAUJO, Jose Humberto de et al. Materials Research, São Carlos, v. 8, n. 3, p. 347-350, 2005. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300021&lng=en&tlng=en. Acesso em: 15 maio 2020. https://doi.org/10.1590/S1516-14392005000300021.
Portuguese Abstract: Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk a-Fe phase (TC = 770 °C).
Abstract: Fe10Ag90 granular alloys have been prepared using a sol-gel process, sintered at 300 °C and annealed at temperatures between 400 °C and 700 °C. The mean size of the iron particles, obtained from X-ray diffraction, is 30.0 ± 0.7 nm. Due to the existence of a distribution of particle sizes in these samples, both blocked (BL) and superparamagnetic (SPM) particles are present simultaneously, as confirmed by magnetization measurements at room temperature. AC susceptibility measurements as a function of temperature reveal a magnetic phase transition at about 770 °C, indicating the presence of particles exhibiting bulk behavior, in the samples annealed above 550 °C. The presence of these particles has been attributed to an atomic diffusion process between the grains, forming bulk-like multiple-domain Fe particles having Curie temperatures near that of bulk a-Fe phase (TC = 770 °C).
URI: https://repositorio.ufrn.br/jspui/handle/123456789/28984
ISSN: 1516-1439 (print) 1980-5373 (online)
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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