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Artigo Científico | Síntese de Materiais Cerâmicos | Inglês | 04/08/2003
Autores: T. Ogasawara, V.R. Caffarena
Palavras-chave: ceramics, chemical synthesis, electron microscopy, garnet ferrite, magnetic properties
Resumo: An investigation was made into the synthesis and magnetic properties of Sm(3-x)HoxFe5O12 (samarium-holmium-iron) garnet ferrite, as yet absent from the literature. The material in question was synthesized by co-precipitation, starting from hydrated chlorides of rare-earth elements and ferrous sulfate, and the mixed hydroxide co-precipitate was calcined at 1000 °C. Using PVA as a binder, rectangular cross section-shaped compacts were produced by means of steel-die pressing, drying and sintering from 1200 to 1450 °C. The main conclusions of this study were that the coercive force decreases as the sintering temperature increases, and that the effect of substituting holmium for samarium in SmIG is entirely different from that provided by replacing yttrium by gadolinium in YIG, which is the most important result of this work. An in-depth investigation will be necessary to determine the correlation between microstructure/magnetic properties and ceramic processing variables.
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