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The effects of high magnetic field on the morphology and microwave electromagnetic properties of MnO2 powder |
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| Authors: | Jia Zhang Li Shuqing Li Xiaogang Liu Shunhua |
| Affiliation: | a Department of Materials Processing Engineering, School of Materials Science & Engineering, Dalian University of Technology, Linggong Road 2, Ganjingzi District, Dalian 116085, Liaoning Province, PR China b Beijing Aeronautical Manufacturing Technology Research Institute, 1 Jun Zhuang east Road, Chaoyang District, Beijing 100024, PR China c School of Materials Science and Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, PR China |
| Abstract: | MnO2 with a sea urchin-like ball chain shape was first synthesized in a high magnetic field via a simple chemical process, and a mechanism for the formation of this grain shape was discussed. The as-synthesized samples were characterized by XRD, SEM, TEM, and vector network analysis. The dielectric constant and the loss tangent clearly decreased under a magnetic field. The magnetic loss tangent and the imaginary part of the magnetic permeability increased substantially. Furthermore, the theoretically calculated values of reflection loss showed that the absorption peaks shifted to a higher frequency with increases in the magnetic field strength. |
| Keywords: | Manganese dioxides High magnetic field Chain shape Electromagnetic properties |
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