| Microwave absorbing properties of La0.8Ba0.2MnO3 nano-particles |
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| 作者姓名： | 周克省 邓建杰 尹荔松 马诗宏 高松华 |
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| 作者单位： | School of Physics Science and Technology, Central South University, Changsha 410083, China |
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| 基金项目： | Project（05JT1034） supported by the Planned Item of Science and Technology of Hunan Province, China |
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| 摘 要： | La0.8Ba0.2MnO3 nano-particles were synthesized by sol-gel process, and the crystal structure and morphology＇ were characterized by XRD and SEM, respectively. The complex permittivity and permeability were determined by microwave vector network analyzer in the frequency range of 2-18 GHz. The relationship between reflection coefficient and microwave frequency of La0.8Ba0.2 MnO3 was calculated based on measured data. The results show that the average diameter of La0.8Ba0.2MnO3 crystal powders is about 80 nm and the crystal structure is perovskite when being calcined at 800 ℃ for 2 h. The microwave absorbing peak is 13 dB at 6.7 GHz and the effective absorbing bandwidth above 10 dB reaches 1.8 GHz for the sample with the thickness of 2.6 mm. The microwave absorption can be attributed to both the dielectric loss and the magnetic loss from the loss tangents of the sample, but the former is greater than the latter.
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| 关 键 词： | 微波吸引材料 微粒物 La0.8Ba0.2MnO3 毫米 |
| 收稿时间： | 8 January 2007 |
| 修稿时间： | 2007-01-08 |
Microwave absorbing properties of La0.8Ba0.2MnO3 nano-particles |
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| ZHOU Ke-sheng,DENG Jian-jie,YIN Li-song,MA Shi-hong,GAO Song-hua.Microwave absorbing properties of La0.8Ba0.2MnO3 nano-particles[J].Transactions of Nonferrous Metals Society of China,2007,17(5):947-950. |
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| Authors: | ZHOU Ke-sheng DENG Jian-jie YIN Li-song MA Shi-hong GAO Song-hua |
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| Affiliation: | School of Physics Science and Technology, Central South University, Changsha 410083, China |
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| Abstract: | La0.8Ba0.2MnO3 nano-particles were synthesized by sol-gel process, and the crystal structure and morphology were characterized by XRD and SEM, respectively. The complex permittivity and permeability were determined by microwave vector network analyzer in the frequency range of 2–18 GHz. The relationship between reflection coefficient and microwave frequency of La0.8Ba0.2MnO3 was calculated based on measured data. The results show that the average diameter of La0.8Ba0.2MnO3 crystal powders is about 80 nm and the crystal structure is perovskite when being calcined at 800 °C for 2 h. The microwave absorbing peak is 13 dB at 6.7 GHz and the effective absorbing bandwidth above 10 dB reaches 1.8 GHz for the sample with the thickness of 2.6 mm. The microwave absorption can be attributed to both the dielectric loss and the magnetic loss from the loss tangents of the sample, but the former is greater than the latter. |
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| Keywords: | La0 8Ba0 2MnO3 nano-particles microwave absorbing materials electromagnetic loss sol-gel |
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