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Issue 32, 2017
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Excellent absorption properties of BaFe12−xNbxO19 controlled by multi-resonance permeability, enhanced permittivity, and the order of matching thickness

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Abstract

For the sol–gel-derived BaFe12−xNbxO19 (x = 0–0.6), coercivity (Hc) and saturation magnetization (Ms) vary from 3.53–0.85 kOe and 70.3–53.8 emu g−1 to 1.02–0.22 kOe and 69.6–59.5 emu g−1, respectively, with an increase in sintering temperature from 1250 °C to 1350 °C. Moreover, ε′ and ε′′ increase from 4.13–4.04 and 0.0049–0.0045 to 7.64–6.93 and 1.50–0.97 over 26.5–40 GHz, and the multi-resonance peaks in permeability shift from ∼40+ GHz to ∼27 GHz. The bandwidth (BW) and reflection loss peak intensity (RLp) are broadened and enhanced from 0.8 GHz and −10.3 dB of the sample with x = 0.2 sintered at 1250 °C under 0.92 mm to 11.9+ GHz and −54 dB, respectively, of the sample with x = 0.6 sintered at 1350 °C under 0.86 mm around a millimeter-wave atmospheric window of 35 GHz. The effects of Nb5+ content (x) and sintering temperature on grain size, phase compositions, formations of Fe2+ and oxygen vacancy, and thus on static magnetism and EM parameters are investigated. The correlations of multi-resonance permeability, enhanced permittivity, and the order of matching thickness with absorption properties are also discussed in detail.

Graphical abstract: Excellent absorption properties of BaFe12−xNbxO19 controlled by multi-resonance permeability, enhanced permittivity, and the order of matching thickness

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Publication details

The article was received on 08 May 2017, accepted on 12 Jul 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP03014B
Citation: Phys. Chem. Chem. Phys., 2017,19, 21893-21903
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    Excellent absorption properties of BaFe12−xNbxO19 controlled by multi-resonance permeability, enhanced permittivity, and the order of matching thickness

    C. Liu, Y. Zhang, Y. Tang, Z. Wang, H. Tang, Y. Ou, L. Yu, N. Ma and P. Du, Phys. Chem. Chem. Phys., 2017, 19, 21893
    DOI: 10.1039/C7CP03014B

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