期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 54, 期 11, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2018.2847563
关键词
Co-doping of CaO and SiO2; high frequency; magneto-dielectrics; NiZnCo ferrite; permeability; permittivity
资金
- National Natural Science Foundation of China [61701420, 61531016]
- Fundamental Research Funds for the Central Universities [2682017CX096]
- Sichuan Key Project of Science and Technology [2016GZ0059]
In this paper, a series of NiZnCo spinel ferrites with the co-doping of CaO and SiO2 (CaO-SiO2) were studied for their potential application as high-frequency magneto-dielectric materials. The effects of CaO-SiO2 on the crystalline phase composition, microstructure, and magnetic and dielectric properties over a wide frequency range of 0.1-5 GHz were systematically investigated. The results reveal that CaO-SiO2 addition reduces the closed pores in NiZnCo ferrite and helps to enhance the permeability. With increasing CaO-SiO2 content (x = 0-0.6 wt%), the permeability mu' increases from similar to 7 to similar to 7.5 at 0.1 GHz. For permittivity epsilon', however, it declines evidently from similar to 9 to similar to 7.8 on account of the decreased grain size and density. Consequently, mu' and epsilon' are balanced to the matching and high values over a wide frequency range of 0.1-1 GHz in the samples with x = 0.3 and 0.6 wt%, accompanied with low loss characteristics that the magnetic loss tan delta(mu) and dielectric loss tan delta(epsilon) are on the order of 10(-2) and 10(-3), respectively.
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