Defect-engineering-driven synergistic modulation of dual-phase (Fe 0.5 Mg 0.5 CoNiCuMn) 3 O 4 @CuO ceramics for superior microwave absorption

作者：Xia Feng, Yixiang Lu, Fanqi Meng, Yi Hou, Xiaodong Feng, Haikui Zhu, Lixi Wang · 发表于：Journal of Advanced Ceramics · 年份：2025 · DOI：10.26599/jac.2025.9221229 · 被引用次数：8 · 研究领域：Electromagnetic wave absorption materials、Magnetic Properties and Synthesis of Ferrites、Metallic Glasses and Amorphous Alloys

To overcome the challenge of insufficient loss strength in single-phase high-entropy ferrites, this work develops a novel defect-engineering-driven dual-phase strategy to fabricate spinel/rock-salt structured (Fe₀.₅Mg₀.₅CoNiCuMn)₃O₄@CuO composite ceramics. Combined experimental characterization and first-principles calculations demonstrate a strong positive correlation between defect concentration and microwave absorption performance. The optimized material achieves outstanding electromagnetic absorption with a minimum reflection loss of -48 dB and an effective absorption bandwidth of 3.9 GHz in the X-band. Remarkably, this work obtains 70% bandwidth retention after 1200 °C oxidation and a thermal conductivity of 2.154 W·m⁻¹·K⁻¹, demonstrating exceptional high-temperature stability and thermal management capability. This study pioneers a new pathway for the development of oxidation resistance and electromagnetic protection materials through defect-engineering-driven synergistic modulation.