Inorganic Materials and Ceramic Matrix composites |
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Preparation and Low Frequency Absorbing Mechanism of PVP Surface Modified Carbonyl Iron/CoFe2O4 Core-Shell Nanostructure |
LI Ze, ZHAO Fang, WANG Jianjiang, GAO Haitao
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Department of Vechicle and Electrical Engineering, Army Engineering University Shijiazhuang Campus, Shijiazhuang 050003, China |
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Abstract The surface of carbonyl iron powder was treated with polyvinylpyrrolidone (PVP), and CoFe2O4 was directly synthesized on the surface of carbonyl iron particles by Co2+ and Fe3+. Three kinds of carbonyl iron/CoFe2O4 core-shells structural powder with different CoFe2O4 content were successfully prepared. The morphology, composition and electromagnetic properties of carbonyl iron particles before and after the addition of CoFe2O4 were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR) and vector network analyzer (VNA). The results show that the irregular particle nano CoFe2O4 powder was successfully prepared. The CoFe2O4 powder was mostly coated on the surface of flaky carbonyl iron. With the increase of the amount of CoFe2O4, the thickness of the coating gradually increases and tends to be completely coated. The CoFe2O4 powder coating layer effectively reduced the dielectric constant of carbonyl iron, improved the impedance matching performance in low frequency, realized the combined absorbing effect of ferroelectric and ferromagnetic, and improved the low frequency absorbing performance. The absorbing properties of the material were analyzed by the interface reflection model and impedance matching principle. The relationship between the peak frequency of the reflection and the electromagnetic parameters was analyzed by the 1/4 wavelength interference cancellation theory.
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Published: 14 July 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51172282), the Innovation and Development of Scientific Research Foundation of Campus(KYSZJQZL1910). |
About author:: Ze Lireceived his master's degree in December 2016 from Ordnance Engineering College. He has study for a doctorate in Army Engineering University Shijiazhuang campus since March 2017, focusing on the research of magnetic absorbing materials and metamaterials. Fang Zhao,associate professor at the Shijiazhuang Campus of the Army Engineering University. She has served as a member of the National College Student Metallurgical Skills Competition Judging Committee and Supervisory Committee. The main research field is functional ceramic absorbing materials. As a key member of the project, she has participated in more than 10 scientific researches in the military including the National Natural Science Foundation of China and the Na-tural Science Foundation of Hebei Province. She has authorized 4 national and national defense invention patents and 5 utility model patents. She has published more than 20 papers in SCI and EI journals. |
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