Sintese e caracterização do solido granular magnetico Fe-Al2O3

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

ln this work, we bave investigated the synthesis and the structura1 and magnetic properties of the Fe-Ah03 nanocomposite which is formed by mettallic Fe nanopartieles embedded into an Ah03 matrix. This nanocomposite belongs to a new materiaIs class tbat it is more known as magnetic granular solids, materiaIs that bave a great technological and scientific potential.howed high coercivity (Hç) values and saturation magnetization (Ms) values lesser than the expected theoretical value to the samples with equivalent percentage of Fe and iron oxides: in the Fe volumetric fraction range ofO.9% to 2.3% ofFe in Ah03 with conversion rate equal to 22% of Fe, it was obtained samples with Hc maximal value of 816 Oe, Ms value of 2.3 emu/g and Fe medium diameter not measurable; in the volumetric fraction range ofFe in Ah03 of2.5% to 17%, with conversion rate between 11 and 52% ofFe, it was obtained Hc values between 540 and 800 Oe, Ms values between 0.1 and 10 emulg and Fe medium diameter between 120 and 520 Á; and in the Fe in Ah03 volumetric fraction range of23% to 62%, with convertion rate between 50 and 80%, it was obtained Hc values between 400 and 650 Oe, Ms values between 39 and 110 emulg and Fe medium diameter between 530 and 800 Á.

ASSUNTO(S)

materiais granulares material ceramico

ACESSO AO ARTIGO

Documentos Relacionados