Electromagnetic and microwave absorption properties of Fe-Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉ shell-core composites

详细信息	查看全文 | 推荐本文 |

• 作者：Zeyang Zhang^a ; Xiangxuan Liu^a ; ^{xiangxuan_study@yahoo.com} ; Xuanjun Wang^a ; Youpeng Wu^b ; Yuan Liu^a
• 关键词：Strontium ferrite ; Carbonyl iron ; Shell-core structure ; Electromagnetic property ; Microwave absorption
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July, 2012
• 卷：324
• 期：13
• 页码：2177-2182
• 文件大小：985 K

摘要

Shell-core Fe-Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉ composites are prepared by chemical vapor deposition (CVD) for use as microwave absorbing materials. Scanning electron microscopy and X-ray diffraction analyses show that the CVD method yields Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉ powders with a uniform coating of Fe. Compared with Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉, Fe-Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉ composites have higher electrical conductivity, permittivity, and dielectric loss, which gradually increase with increasing Fe content. When Sr_0.8La_0.2Fe_11.8Co_0.2O₁₉/Fe=7:3, a reflection loss (RL) exceeding 鈭?0 dB is obtained in the frequency range of 10-14 GHz at a coating thickness of 2.0 mm. A minimum RL of 鈭?0 dB was found at 8.0 GHz, corresponding to a matching thickness of 2.8 mm.