Controllable synthesis of MOF-derived Fe.sub.xNi.sub.1-x@C composites with dielectric-magnetic synergy toward optimized impedance matching and outstanding microwave absorption

• Published in: Journal of materials science 2021-01, Vol.56 (1), p.592
• Main Authors: Zhu, Tongguang, Sun, Yong, Wang, Yajing, Xing, Hongna, Zong, Yan, Ren, Zhaoyu, Yu, Haiping
• Format: Article
• Language: English
• Subjects: Pyrolysis
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-020-05307-w

The impedance matching is a very important part to influence materials' microwave absorption performance. However, a way to further discuss the impedance matching is still weak. We build a novel dielectric-magnetic impedance matching (DMIM) model to analyze the real part and imaginary part of materials' impedance matching. To verify the practicality of the DMIM model, using MIL-100(Fe) as precursor, a series of Fe.sub.xNi.sub.1-x@C are synthesized via one-step pyrolysis by controlling the samples' Fe-Ni ratio, changing their dielectric loss tangent and magnetic loss tangent and successfully regulating their impedance matching to optimize microwave absorption properties. In addition, the minimum reflection loss for MOF-derived Fe.sub.0.8Ni.sub.0.2@C can arrive at -71.3 dB at 10.3 GHz with a thickness of 3.1 mm, and the effective absorption bandwidth is 5.3 GHz. And combining with the RLGC equivalent circuit model to further indicate the Fe.sub.xNi.sub.1-x@C's energy loss mechanism. The method of using DMIM model and RLGC model to discuss materials' impedance matching and energy loss mechanism paves a new way to fabricate high-performance microwave materials with balanced electromagnetic distribution and further reveal the materials' microwave absorbing mechanism.