Effect of Cr substitution on microwave absorption of BaFe12O19 |
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| Affiliation: | 1. School of Environmental and Materials Engineering, Yantai University, Yantai 264005, China;2. Nanjing Research Institute of Electronics Technology, Nanjing 210013, China;3. State Key Laboratory of MMCs, Shanghai Jiaotong University, Shanghai 200030, China;1. Nano Scale Physics Laboratory, Department of Physics, Air University, PAF Complex E-9, Islamabad, Pakistan;2. Applied Thermal Physics Laboratory, Department of Physics, COMSATS Institute of Information Technology, Islamabad 44000, Pakistan;1. Chemical Engineering Department, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15261, United States;2. U.S. Department of Energy – National Energy Technology Laboratory, Pittsburgh, PA, United States;1. Tanta University, Faculty of Engineering, Department of Engineering Physics and Mathematics, Tanta, Egypt;2. Ain Shams University, Faculty of Science, Physics Department, Cairo, Egypt;1. National University of Science and Technology MISiS, 119049, Moscow, Leninsky Prospekt, 4, Russia;2. South Ural State University, 454080, Chelyabinsk, Lenin''s Prospect 76, Russia;3. SSPA “Scientific and Practical Materials Research Center of NAS of Belarus”, 220072, Minsk, 19 P. Brovki Str., Belarus;4. Physics Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt;5. Joint Institute for Nuclear Research, 141980, Dubna, 6 Joliot-Curie Str., Russia;6. Donetsk Institute of Physics and Technology named after O.O. Galkin of the NAS of Ukraine, 03680, Kyiv, Prospect Nauky, 46, Ukraine;7. L.N. Gumilyov Eurasian National University, Astana, Kazakhstan;8. The Institute of Nuclear Physics of Republic of Kazakhstan, Astana, Kazakhstan;9. Ural Federal University named after the First President of Russia B.N. Yeltsin, Yekaterinburg, Russia;1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China;2. Department of Mechanical Engineering, Chiang Mai University, Chiang Mai 50200, Thailand |
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| Abstract: | The chromium substituted barium hexaferrites were prepared by self-propagating combustion method. The crystalline structure, complex permittivity, complex permeability, and hyperfine parameters of BaFe12−xCrxO19 (x varies from 0.2 to 1.0 in a step of 0.2) were measured with X-ray diffraction, vector network analyzer and Mössbauer spectroscopy. At 850 °C, only a part of Cr3+ ions are permitted to enter the lattice of barium ferrite. With further calcination at 1000 °C, all Cr3+ ions enter the lattice. After substitution, the complex permittivity is increased. The Cr3+ ions substitute for the Fe3+ ions on the 2a site, and simultaneously lead to a quadrupole splitting on the 4f1 site. These changes decrease the anisotropy field, which are accordant with the spectra of μ″. In the crystalline cells of the substituted barium ferrites, some Fe2+ ions are formed. It results in a bigger dielectric loss. |
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