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Effect of single Hf4+ ion substitution on microstructure and magnetic properties of hexagonal M-type Ba(Hf)xFe12−xO19 ferrites

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Abstract

Hf4+ substituted M-type hexaferrites with composition of BaHfxFe12−xO19 (x = 0–0.08 in step of 0.02 ) were synthesized via a solid reaction method. Pure M phase was observed by XRD analysis excepted when x = 0.08, the second phase (HfO2) appeared when x = 0.08. With increase of the Hf4+ substitution contents, the average grain size decreased, the shape of grains became irregular gradually and some small particles appeared and spacing between grains increased. It could be explained by lattice distortion and the agglomeration of grains. In terms of magnetic properties, the saturation magnetization (Ms) decreased from 81.16 emu/g to 38.36 emu/g and the coercivity (Hc) increased from 666 Oe to 1220 Oe as x increased from 0.00 to 0.08, which might be attributed to occupancies of Hf4+ ions on 2b sublattice. This would result in a valence change of Fe3+ to Fe2+ at the 2a site. Moreover, the magnetocrystalline anisotropy of the samples maintained a high level and changed slightly, while the saturation magnetization of the samples decreased to a low level, which provided a choice for magnetic materials to meet higher frequency applications.

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Funding

This work was supported by the National Natural Science Foundation of China [Grant Numbers 51872041].

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China

    Lei Zhou, Yingli Liu, Qian Liu, Binghao Qi, Yanjun Chen, Jianfeng Chen & Huaiwu Zhang

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  1. Lei Zhou
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  2. Yingli Liu
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  3. Qian Liu
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  5. Yanjun Chen
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Correspondence to Yingli Liu.

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Zhou, L., Liu, Y., Liu, Q. et al. Effect of single Hf4+ ion substitution on microstructure and magnetic properties of hexagonal M-type Ba(Hf)xFe12−xO19 ferrites. J Mater Sci: Mater Electron 31, 4106–4112 (2020). https://doi.org/10.1007/s10854-020-02957-z

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