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The barium ferrite BaTixFe12-xO19 (x = 0.2, 0.4, 0.6, 0.8) (BFTO-x) ceramics doped by Ti4+ were synthesized by a modified sol-gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO-x ceramics were high quality single phase with sheet microstructure. With x increasing from 0.2 to 0.8, the saturation magnetization (Ms) decreases gradually but the change trend of coercivity (Hc) is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti4+, double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity (μ′′) and the resonance peaks could move toward the low frequency with the increase of x, which facilitate the samples perform an excellent wideband modulation microwave absorption property. In the x = 0.2 sample, the maximum reflection loss (RL) can reach -44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than -10 dB. All the BFTO-x ceramics show excellent frequency modulation ability varying from 18 (x = 0.8) to 4 GHz (x = 0.4), which covers 81% of the investigated frequency in microwave absorption field. This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices.


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A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption

Show Author's information Jun LIa,b( )Yang HONGcSan HEa,bWeike LIa,bHan BAIa,bYuanhua XIAdGuangai SUNdZhongxiang ZHOUa,b( )
School of Physics, Harbin Institute of Technology, Harbin 150001, China
Heilongjiang Provincial Key Laboratory of Plasma Physics and Application Technology, Harbin Institute of Technology, Harbin 150001, China
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
Key Laboratory for Neutron Physics of CAEP, Institute of Nuclear Physics and Chemistry, Mianyang 621999, China

† Jun Li and Yang Hong contributed equally to this work.

Abstract

The barium ferrite BaTixFe12-xO19 (x = 0.2, 0.4, 0.6, 0.8) (BFTO-x) ceramics doped by Ti4+ were synthesized by a modified sol-gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO-x ceramics were high quality single phase with sheet microstructure. With x increasing from 0.2 to 0.8, the saturation magnetization (Ms) decreases gradually but the change trend of coercivity (Hc) is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti4+, double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity (μ′′) and the resonance peaks could move toward the low frequency with the increase of x, which facilitate the samples perform an excellent wideband modulation microwave absorption property. In the x = 0.2 sample, the maximum reflection loss (RL) can reach -44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than -10 dB. All the BFTO-x ceramics show excellent frequency modulation ability varying from 18 (x = 0.8) to 4 GHz (x = 0.4), which covers 81% of the investigated frequency in microwave absorption field. This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices.

Keywords:

barium ferrite, neutron diffraction, microwave absorption
Received: 30 January 2021 Revised: 20 August 2021 Accepted: 21 August 2021 Published: 11 January 2022 Issue date: February 2022
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Publication history

Received: 30 January 2021
Revised: 20 August 2021
Accepted: 21 August 2021
Published: 11 January 2022
Issue date: February 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (U2130110 and 51502054).

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