Zhaohua Wang, Li Guan, Yujie Zhu, Chenqiang Duan, Keqiang Cheng, Yuling Yao, Shijie Han, Shixuan Han, Qiancheng Gao, Yuanyuan Zhang, Biao Zhao, Xiaoqin Guo, Rui Zhang
As a green and efficient heating technology, microwave heating technology is widely recognized for its innovative mechanism. In this work, (Cr 0.2 Mn 0.2 Fe 0.2 Co 0.2 Ni 0.2 ) 3 O 4 high-entropy oxide ceramics were efficiently synthesized by microwave heating. The work shows that microwave heating technology has unique advantages to realize uniform sintering of high-performance ceramic materials in a short time. In the low-temperature phase, a high-frequency electric field acts on magnetic metal oxides to trigger microwave absorption and lattice vibration. These responses drive dipole polarization of polar ions and subsequently boost magnetic and dielectric losses, enabling efficient rapid heating. Under high-frequency electromagnetic fields, the high-speed movement and frequent collisions of charged particles are facilitated. Charge transport within the material is promoted accordingly. The crystal solid solution of high-entropy materials is accelerated. In the high-temperature , the lattice distortion and defect distribution of materials are optimized by the synergistic action of heat and electricity, promoting the perfect crystal growth of high-entropy materials. The defect density was found to gradually decrease with increasing heating temperature, while lattice distortion stabilized. Ms was measured to jump to 19.7 emu/g at 1200 °C, and Hc was increased to 241 Oe, enhancing the material's resistance to demagnetization. The reaction mechanism of microwave-sintered high-entropy ceramics was clarified. It offers theoretical and experimental support for rapid fabrication processes.