Magnetic properties and microstructure of Ba-ferrite powders prepared by ball milling
The magnetic properties and the phase constitution of barium ferrite powders with Fe/Ba ratios varying from 7 to 15 and heat-treated in the temperature range 1000-1200°C are reported. The results showed that heating temperature was e!ective in increasing the magnetization (Ms ) of the powders for ra...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión enviada para evaluación y publicación |
| Fecha de publicación: | 2000 |
| País: | México |
| Institución: | Centro de Investigación en Materiales Avanzados |
| Repositorio: | Fuente de Objetos Científicos Open Access del CIMAV |
| Idioma: | inglés |
| OAI Identifier: | oai:cimav.repositorioinstitucional.mx:1004/1030 |
| Acceso en línea: | http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1030 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Coercivity/Ba-ferrite info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/22 info:eu-repo/classification/cti/2299 info:eu-repo/classification/cti/229999 |
| Sumario: | The magnetic properties and the phase constitution of barium ferrite powders with Fe/Ba ratios varying from 7 to 15 and heat-treated in the temperature range 1000-1200°C are reported. The results showed that heating temperature was e!ective in increasing the magnetization (Ms ) of the powders for ratios> 10. For lower ratios Ms increased initially and then decreased with increasing temperature, presumably due to the formation of BaFe2O4. The coercivity (Hci ) presented a maximum for all the compositions and then decreased due to particle growth. In addition, the effect of the milling time on the magnetic properties and powder characteristics was investigated. It was found that 40 h of milling led to having samples with less volume fraction of second phases and that the magnetic properties were also maximized. TEM micrographs show particle sizes varying from 0.1 to 2 μm. |
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