Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 739, Issue -, Pages 202-210Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.12.086
Keywords
Plate-like BaFe12O19; Core-shell composite; Exchange coupling; Microwave absorption performances
Categories
Funding
- National Natural Science Foundation of China [51772177]
- Chinese Postdoctoral Science Foundation [2016M590916]
- Science and Technology Foundation of Wei yang District of Xi'an City [201605]
- Industrialization Foundation of Education Department of Shaanxi Provincial Government [16JF002]
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A novel plate-like BaFe12O19@Fe3O4 core-shell composite was successfully synthesized by a hydrothermal method. The phase structure and morphology of as-prepared composite was characterized by XRD, SEM and TEM. The results show that uniform Fe3O4 microspheres with a diameter of about 10 nm were generated as the shell of plate-like BaFe12O19 grains. The static magnetic properties and electromagnetic parameters in the microwave range were measured using a vibrating sample magnetometer and a vector network analyzer, respectively. The obtained BaFe12O19@Fe3O4 composite exhibits a saturation magnetization of 43 emu/g and a coercivity of 224 Oe at room temperature. A minimum reflection loss of -33.6 dB was observed at 11.6 GHz with a thickness of 2.5 mm in the frequency range of 2-18 GHz, indicating the excellent microwave absorption performances of the novel composite. This improvement in microwave absorption can mainly be attributed to the enhanced magnetic properties due to the exchange coupling effect between the hard magnetic phase (BaFe12O19) and the soft magnetic phase (Fe3O4). (C) 2017 Elsevier B.V. All rights reserved.
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