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Issue 40, 2016
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Zr4+ doping-controlled permittivity and permeability of BaFe12−xZrxO19 and the extraordinary EM absorption power in the millimeter wavelength frequency range

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Abstract

M-type barium ferrite powders doped with Zr4+ ions (BaFe12−xZrxO19x = 0–0.4), possessing high permittivity and multi-resonant permeability, were synthesized by the sol–gel process. The single-phase hexagonal plate-like barium ferrites were formed with Zr4+ substituting Fe3+ at the 4f1 sites initially and then at the 2b sites afterwards with increasing doping content. The Ha of the ferrites decreased from 15.75 kOe to 8.13 kOe with increasing Zr4+ from x = 0 to 0.4. The ε′ and ε′′ of the ferrite with Zr4+ doping were increased to 7.7–6 and 3.4–1.5 over 18–40 GHz from 5.8–5 and 0.7–0.4 without doping, respectively. Contributed mainly by the enhanced permittivity, the matching thicknesses of the Zr4+ ions doped ferrites were as low as only ∼1 mm or below, i.e. 1.5–3 times thinner than those reported recently. The complex permittivity was still close to the complex permeability in the doped ferrites. Hence, a strong reflection loss of ∼−50 dB could be attained and the absorptivity of electromagnetic (EM) power per unit thickness reached as high as 0.156% μm−1, i.e. 2–5 times higher than those of novel absorbing materials. The multi-resonance permeability peaks originated from Fe3+ ions, and exchange couplings among Fe3+, Fe2+ and O contributed multiple reflection loss peaks and thus, a broad bandwidth of ∼12 GHz (RL < −10 dB), which was 2–4 times broader than those normally reported. Consequently, the Zr4+-doped barium ferrites are promising for use as excellent absorbing materials in the millimeter wavelength frequency range.

Graphical abstract: Zr4+ doping-controlled permittivity and permeability of BaFe12−xZrxO19 and the extraordinary EM absorption power in the millimeter wavelength frequency range

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Publication details

The article was received on 09 Aug 2016, accepted on 14 Sep 2016 and first published on 14 Sep 2016


Article type: Paper
DOI: 10.1039/C6TC03430F
Citation: J. Mater. Chem. C, 2016,4, 9532-9543
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    Zr4+ doping-controlled permittivity and permeability of BaFe12−xZrxO19 and the extraordinary EM absorption power in the millimeter wavelength frequency range

    C. Liu, Q. Xu, Y. Tang, Z. Wang, R. Ma, N. Ma and P. Du, J. Mater. Chem. C, 2016, 4, 9532
    DOI: 10.1039/C6TC03430F

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