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Matching Permeability and Permittivity of Ga-Substituting Mg-Cd Ferrites for High-Frequency Antennas

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Abstract

This work mainly investigated the effects of gallium-substituting iron on the magnetic and dielectric properties of Mg-Cd ferrites Mg0.8Cd0.2Fe2-xGaxO4 (x = 0.0, 0.05, 0.10, and 0.15) for high-frequency antennas. All the samples were synthesized at 1170 °C. XRD patterns indicated the samples crystallized in normal spinel structure. Magnetic and dielectric spectrum measurement results revealed that the permeability and permittivity of the samples were tailored with change of x value. Finally, the composites possessed excellent matching permeability (μ′) and permittivity (ε′) (x = 0.10, μ′/ε′ ≈ 1.2), over a long frequency range from 1 to 40 MHz. Comparatively, low dielectric loss tanδε and magnetic loss tanδμ (tanδε ≈ 0.003, tanδμ ≈ 0.035) were obtained due to densification sintering displayed in the SEM figures. Furthermore, magnetic properties were enhanced, such as increased saturation magnetization (approximately 22.14 emu/g) and decreased coercivity (approximately 51.67 Oe), as x value increased. These properties validated the introduction of Ga ions could take effect in high-frequency region applications for Mg-Cd ferrites.

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Acknowledgments

The authors would like to thank the reviewers for their valuable comments.

Funding

This work is partially supported by the National Natural Science Foundation of China under grant (nos. 61501494, 61701523, 61801508, 61871474), the Natural Science Foundational Research Fund of Shaanxi Province (nos. 2017JM6025, 2018JM6040), the Young Talent fund of University Association for Science and Technology in Shaanxi Province (no. 20170107), Postdoctoral Innovative Talents Support Program of China (BX20180375), and Innovative Talents Cultivate Program of Shaanxi Province (No.2017KJX-24).

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Authors and Affiliations

  1. Information and Navigation College, Air Force Engineering University, Xi’an, 710077, China

    Pinglu Wang, Meng Zhu, Nan Xiao, Bei Hou, Wei Lu & Fuwei Jiang

  2. Department of Science Research, Air Force Engineering University, Xi’an, 710077, China

    Wanze Zheng

  3. School of Optoelectronic Engineering, Xi’an Technological University, Xi’an, 710021, China

    Yang Chen & Fei Xie

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  1. Pinglu Wang
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Correspondence to Pinglu Wang.

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Wang, P., Zhu, M., Zheng, W. et al. Matching Permeability and Permittivity of Ga-Substituting Mg-Cd Ferrites for High-Frequency Antennas. J Supercond Nov Magn 33, 559–564 (2020). https://doi.org/10.1007/s10948-019-05228-z

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