Fabrication and performance optimization of Mn–Zn ferrite/EP composites as microwave absorbing materials

• Published in: Chinese physics B Vol. 22; no. 12; pp. 478 - 482
• Main Author: 王文杰 臧充光 焦清介
• Format: Journal Article
• Language: English
• Published: 01.12.2013
• Subjects: Absorption; Combustion; Ferrite; Low frequencies; Manganese; Microwaves; Particulate composites; Reflection; Scanning electron microscopy; X-射线衍射; ZN铁氧体; 制备; 微波吸收材料; 性能优化; 扫描电子显微镜; 环氧树脂复合材料; 聚合物涂层
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/12/128101

Magnesium-substituted Mn0.8Zn0.2Fe2O4 ferrite is synthesized by the sol–gel combustion method using citrate acid as the complex agent. The electromagnetic absorbing behaviors of ferrite/polymer coatings fabricated by dispersing Mn–Zn ferrite into epoxy resin （EP） are studied. The microstructure and morphology are characterized by X-ray diffraction and scanning electron microscope. Complex permittivity, complex permeability, and reflection loss of ferrite/EP composite coating are investigated in a low frequency range. It is found that the prepared ferrite particles are traditional cubic spinel ferrite particles with an average size of 200 nm. The results reveal that the electromagnetic microwave absorbing properties are significantly influenced by the weight ratio of ferrite to polymer. The composites with a weight ratio of ferrite/polymer being 3：20 have a maximum reflection loss of –16 dB and wide absorbing band. Thus, the Mn–Zn ferrite is the potential candidate in electromagnetic absorbing application in the low frequency range （10 MHz–1 GHz）.