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The microwave absorption properties of La0.8Sr0.2Mn1−yFeyO3 nanocrystalline powders in the frequency range 2-18 GHz |
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| Authors: | K.-S. Zhou K.-L. Huang D. Wang Y.-P. Zhou |
| Affiliation: | a School of Physics Science and Technology, Central South University, Changsha Hunan 410083, China b School of Physics Science and Technology, South China University of Technology, Guangzhou 510641, China c School of Chemistry and Chemical Engineering, Central South University, Changsha Hunan 410083, China |
| Abstract: | La1−xSrxMn1−yFeyO3 nanocrystalline powders were prepared by the sol-gel method as a microwave absorption material. The reflectance, the dielectric loss tan δe and the magnetic loss tan δm of the samples were calculated according to the data of electromagnetism parameters measured by a microwave vector network analyzer in the frequency range 2-18 GHz. The dielectric loss tan δe and the magnetic loss tan δm had a step-change at a certain frequency so that the superiority of dielectric loss change into the superiority of magnetic loss, which indicated that anti-ferromagnetic clusters in the material change into ferromagnetic clusters by absorbing quantum of microwave electromagnetic field when the frequency of incident microwave reaches a certain value. The effective absorption bandwidth higher than 10 dB reached 6.2 GHz. As a result, the La0.8Sr0.2Mn1−yFeyO3 has shown useful applications as a microwave absorption material. |
| Keywords: | 78.70.Gg 61.46.&minus W 82.70.Gg |
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