High-energy ball milling of Ba-hexaferrite/Fe magnetic composite

被引：38

作者：

Bercoff, PG ^{[1
]}

Bertorello, HR ^{[1
]}

机构：

[1] Univ Nacl Cordoba, Fac Matemat Astron & Fis, RA-5000 Cordoba, Argentina

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 187卷 / 02期

关键词：

Ba-hexaferrite; magnetic composite; fine particles; high coercivity; ball milling;

D O I：

10.1016/S0304-8853(98)00097-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Ba-hexaferrite/Fe composite is synthesized using a high-energy ball mill. Changes in the crystalline structure and magnetic properties are studied with the aid of X-ray diffraction and magnetization measurements. The product after an 80 h mill is magnetite (Fe3O4) and barium carbonate (BaCO3). After heating up to 1300 K in air and Ar atmospheres it is found that in the former case the product is phase M (BaFe12O19) and hematite (alpha-Fe2O3) with improved magnetic properties while in the second, BaFe12O19 and Fe3O4 are obtained. This is a magnetic composite material having both dipolar and exchange couplings. The coercivity observed is explained in terms of the modified Brown's equation for inverse domain nucleation fields. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：169 / 176

页数：8

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