Study on preparation and microwave absorption property of the core-nanoshell composite materials doped with La |
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| Authors: | Liqiu Wei Ruxin Che Yijun Jiang Bing Yu |
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| Institution: | 1. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;2. School of Physics, Peking University, Beijing 100871, China;1. Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan;2. School of Chemistry and Chemical Engineering, Queen’s University Belfast, UK;3. Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan;4. Centre for Solid State Physics, University of Punjab, Lahore, Pakistan;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Electroceramics Group, Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz 13876-71557, Iran;1. Crystal Growth & Materials Research Laboratory, Department of Physics and Electronics, University of Jammu, Jammu 180006, India;2. National Chemical Laboratory, Homi Bhabha Road, Pashan, Pune;1. Materials Research Laboratory, Srikrishna Mahavidyalaya Gunjoti, Omerga, Osmanabad 413 613, MS, India;2. Department of Chemistry, Jawahar Art Science and Commerce College Andur, Osmanabad, MS, India;3. Spin Device Technology Center, Department of Information Engineering, Shinshu University, Nagano 380-8553, Japan;1. Post Graduate and Research Department of Physics, The American College, Madurai 625002, India;2. Research and Development Centre, Bharathiar University, Coimbatore 641046, India;3. Advanced Magnetics Laboratory, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India;4. Advanced Magnetic Materials Laboratory (AMMLa), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India;5. NCRL Laboratory, Department of Materials Science and Engineering, KAIST, Daejeon 305701, South Korea;1. Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania;2. National Institute of Material Physics, 077125 Bucharest, Romania |
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| Abstract: | Microwave absorbing material plays a great role in electromagnetic pollution controlling, electromagnetic interference shielding and stealth technology, etc. The core-nanoshell composite materials doped with La were prepared by a solid-state reaction method, which is applied to the electromagnetic wave absorption. The core is magnetic fly-ash hollow cenosphere, and the shell is the nanosized ferrite doped with La. The thermal decomposition process of the sample was investigated by thermogravimetry and differential thermal analysis. The morphology and components of the composite materials were investigated by the X-ray diffraction analysis, the microstructure was observed by scanning electron microscope and transmission electron microscope. The results of vibrating sample magnetometer analysis indicated that the exchange-coupling interaction happens between ferrite of magnetic fly-ash hollow cenosphere and nanosized ferrite coating, which caused outstanding magnetic properties. The microwave absorbing property of the sample was measured by reflectivity far field radar cross section of radar microwave absorbing material with vector network analyzer. The results indicated that the exchange-coupling interaction enhanced magnetic loss of composite materials. Therefore, in the frequency of 5 GHz, the reflection coefficient can achieve ?24 dB. It is better than single material and is consistent with requirements of the microwave absorbing material at the low-frequency absorption. |
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| Keywords: | magnetic fly-ash hollow cenosphere La core-nanoshell composite materials magnetic properties |
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