| Autor: |
Thi Kim Yen, Nguyen, Tuan, Nguyen Quy, Trinh, Ngoc Dat, Son Le, Vu Truong, Dang, Ngoc Toan, Thi Le, Anh, Tran, Nguyen Tien, Tran, Ngo |
| Zdroj: |
Advances in Natural Sciences: Nanoscience and Nanotechnology; June 2022, Vol. 13 Issue: 2 p025006-025006, 1p |
| Abstrakt: |
We successfully prepared BaFe12O19(BaM) nano-hexaplates using the co-precipitation method followed by heat treatment. The hexaplate-like grain size varied in the range of 50–200 nm, while its crystalline size was ∼46 nm. Before investigating microwave absorption, structural and magnetic properties were studied by x-ray diffraction, Raman scattering, and a vibrating sample magnetometer. The structural studies showed a pure phase of BaM, while the magnetic studies revealed a ferro/ferrimagnetic behaviour with Ms= 59.93 emu g−1, Mr= 32.49 emu g−1, and Hc= 5.16 kOe. Microwave dissipation features were systemically investigated for device thickness of 0.25–10 mm with a measured frequency range of 2–16 GHz. The study showed that the BaFe12O19sample could absorb more than 99.9% of the incident microwave in the 12–14 GHz frequency range for 6.5 mm thickness. The effective absorption bandwidth was also fairly large, as ∼3 GHz in this frequency range. The microwave dissipation features of BaM in this work were better than pure BaM ones in other studies and relatively comparable with BaM-based microwave absorbers. The magnetic loss originated from natural resonance, while the dielectric loss resulted from multi-interface, interface, and dipolar polarization. Overall, the BaFe12O19sample in this study could be used as a promising microwave absorber in the Ku waveband. |
| Databáze: |
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