Equivalent permeability and permittivity of Sm substituted Mg–Cd ferrites for high-frequency applications
JOURNAL OF ALLOYS AND COMPOUNDS(2020)
摘要
The effects of Sm3+ ion substitution on the magnetic and dielectric properties of Mg ferrites (Mg0.8Cd0.2Fe2-xSmxO4) with 2.5 wt% Bi2O3 were investigated for use as high-frequency antenna substrates. Various concentrations of Sm3+ ions (x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10) were employed to modify the permeability (mu') and permittivity (epsilon') of the ferrites. Experimentally, the composites synthesized using the conventional solid-state reaction method exhibited equal mu' and epsilon' (x = 0.10, mu' approximate to 23H/m, epsilon' approximate to 25 F/m) over a long frequency band covering 1 MHz-100 MHz. Low loss tangents (dielectric loss tan delta(epsilon) approximate to 0.004 and magnetic loss tan delta(mu) approximate to 0.038) were also obtained over the same frequency range. Furthermore, a saturation magnetization of up to 24.45 emu/g and coercivity of up to 36 Oe were achieved when x increased to 0.10, indicating that the magnetization of the samples was enhanced. The excellent properties obtained in the Sm3+ substituted Mg ferrites suggest that they could be promising candidates for modern high-frequency antenna substrates. (C) 2019 Elsevier B.V. All rights reserved.
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关键词
Mg0.8Cd0.2Fe2-xSmxO4 composites,Enhanced magnetization,Equivalent permeability and permittivity,Low loss
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