Microwave absorption properties of Co, Cu, Zn: Substituted hexaferrite polychloroprene nanocomposites

被引：0
|
作者：
da Rocha Caffarena, Valeska [1 ]
Capitaneo, Jefferson Leixas [2 ]
Ogasawara, Tsuneharu [3 ]
Pinho, Magali Silveira [4 ]
机构：
[1] PETROBRAS - Gás and Energia - Corporativo, Tecnologia para Processos de Gás e Energia, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, Brazil
[2] Instituto de Macromoléculas - IMA, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, Brazil
[3] Programa de Eng. Metalúrgica e de Materiais, COPPE, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, Brazil
[4] Instituto de Pesquisas da Marinha - IPqM, Brazil
来源：
Materials Research | 2008年 / 11卷 / 03期
关键词：
Ferrites - Iron alloys - Cobalt alloys - Saturation magnetization - Ternary alloys - Zinc alloys - Ferrite - Magnetic permeability - Copper alloys;
D O I：
10.1590/s1516-14392008000300017
中图分类号：
学科分类号：
摘要：
The magnetic behavior and its relationship with microwave absorbing properties have been investigated for doped Z-type barium hexaferrites (Ba3Co1.3Zn0.3Cu0.4 Fe24O41)/polychloroprene (CR) nanocomposites. Simultaneous substitutions by Co2+, Cu2+, and Zn2+ ions make possible the use of these materials as RAMs, due to the frequency dependence of μr* (permeability), responsible for the location of the hexaferrite natural resonance. The Cu2+ ions distort the crystalline field due to their electronic configuration, and this behavior results in an increase in the saturation magnetization (Ms), which improve the magnetic permeability. Similarly, the superparamagnetic contribution (associated to the nanometric size) led to the improvement of the microwave absorption.
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页码：335 / 339
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