Élaboration et caractérisation physico-chimique de nouveaux ferrites mixtes Mo-Co

Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy Pub Date : 1997-12-01 DOI:10.1016/S1251-8069(97)82340-8

Sylvie Douard, Philippe Tailhades, Abel Rousset

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引用次数: 2

Abstract

New Mo_xCo_yFe_{3 − x − y}O₄ ferrites have been prepared from hydroxide precursors leading to fine spherical particles. The so-obtained products have quite high substitution rates (x ≈ 0.5 and 0 ⩽ y ⩽ 1), higher than those ever reported for Mo-Co ferrites. The substitution of Fe²⁺ ions by Co²⁺ ions, which have a stronger magnetocrystalline anisotropy, and the directional order phenomenon both involve an enhancement in coercivity. Nevertheless, because of differences in composition, in cationic distribution and in particle morphology, the Mo-Co ferrites synthesized according to our process show a coercive force lower than that observed by other workers. The cobalt element stabilizes the spinel structure of the ferrites by decreasing their reactivity towards oxygen. Besides, for high cobalt content, a proportion of these ions has the valency state + III.

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新型Mo-Co混合铁氧体的制备与物理化学表征

用氢氧化物前驱体制备了新的MoxCoyFe3−x−yO4铁氧体，得到了细小的球形颗粒。所得产物具有很高的取代率(x≈0.5和0≤y≤1)，高于以往报道的Mo-Co铁氧体的取代率。具有更强磁晶各向异性的Co2离子取代Fe2+离子和定向有序现象均涉及矫顽力的增强。然而，由于组成、阳离子分布和颗粒形态的不同，根据我们的工艺合成的Mo-Co铁氧体的矫顽力比其他工人观察到的要低。钴元素通过降低铁素体对氧的反应性来稳定铁素体的尖晶石结构。此外，当钴含量高时，这些离子中有一部分的价态为+ III。

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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy

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