| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312879 |
| ISSN: | 1516-1439 |
| Autores: | Soares, Joao Maria1 Araujo, Jose Humberto de2 Cabral, Francisco de Assis Olimpio Dumelow, Thomas3 Xavier-Junior, Milton Morais Sasaki, Jose Marcos4 |
| Instituciones: | 1Universidade Federal de Pernambuco, Departamento de Fisica, Recife, Pernambuco. Brasil 2Universidade Federal do Rio Grande do Norte, Departamento de Fisica Teorica e Experimental, Natal, Rio Grande do Norte. Brasil 3Universidade do Estado do Rio Grande do Norte, Departamento de Fisica, Mossoro, Rio Grande do Norte. Brasil 4Universidade Federal do Ceara, Departamento de Fisica, Fortaleza, Ceara. Brasil |
| Año: | 2005 |
| Periodo: | Jul-Sep |
| Volumen: | 8 |
| Número: | 3 |
| Paginación: | 347-350 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | 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) |
| Disciplinas: | Ingeniería, Física y astronomía |
| Palabras clave: | Ingeniería de materiales, Electromagnetismo, Aleaciones, Materiales magnéticos, Temperatura, Propiedades magnéticas |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Electromagnetism, Alloys, Magnetic materials, Temperature, Magnetic properties |
| Texto completo: | Texto completo (Ver HTML) |
