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

Materials Research

Valeska Da Rocha Caffarena²  Jefferson Leixas Capitaneo¹  Tsuneharu Ogasawara¹  Magali Silveira Pinho¹ 

[1] ,PETROBRAS Gás & Energia - Corporativo

关键词: Z-type hexaferrite;    radar absorption material;    permittivity;    permeability;    magnetic properties;   

DOI  :  10.1590/S1516-14392008000300017

来源: SciELO

【 摘 要 】

The magnetic behavior and its relationship with microwave absorbing properties have been investigated for doped Z-type barium hexaferrites (Ba3Co1.3Zn0.3Cu0.4Fe 24O41)/ 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.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License