Dual-ion substitution induced high impedance of Co 2 Z hexaferrites for ultra-high frequency applications

Li, Qifan; Yan, Shuoqing; Wang, Xian; Nie, Yan; Zhang, Feng; Su, Zhongqing; Chen, Yajie; Harris, Vincent G.

doi:10.1016/j.actamat.2015.07.038

Cited by 29 publications

(1 citation statement)

References 18 publications

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“…where L is the total line length, and M and N are the magnification and the total number of intercepts, respectively. The decrease in grain size with the increase in Sr 2+ ion substitution is due to the smaller ion radius of Sr 2+ ions than that of Ba 2+ ; small ion radius always causes low grain size [26]. On the other hand, with the increase in Sr 2+ ion substitution, more pores are observed due to the increased difficulty in crystallisation and clusters of grains [27].…”

Section: Semmentioning

confidence: 99%

Sr2+ Ion Substitution Enhanced Dielectric Properties of Co(2)Z Ferrites for VHF Antenna Substrate

Wang

Gan

2022

Metals

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The effect of Sr2+ ions on the microstructure and high frequency properties of 2.5 wt% Bi2O3 added to Co(2)Z hexaferrites (3Ba(1-x)SrxO•2CoO•12Fe2O3, x = 0.0, 0.2, 0.4 and 0.6) synthesised using the solid-state reaction method was investigated. Experimental results indicate that the dielectric properties were markedly enhanced with the increase in the content of Sr2+ ions, thereby increasing the miniaturisation factor, which enables a size reduction in a long frequency range. Slight changes to saturation magnetisation (Ms) and coercivity (Hc) were observed, i.e., the saturation magnetisation (Ms) decreased from 39.99 to 38.11 emu/g, and coercivity (Hc) increased from 59.05 to 65.21 Oe when x increased from 0.0 to 0.6. Meanwhile, ε′ increased from approximately 8 to 12, indicating the invariability in μ′. In addition, the processed materials exhibit relatively low magnetic loss and dielectric loss (magnetic loss tanδμ ≈ 0.08 and dielectric loss (tanδε ≈ 0.007)). These results indicate that the substituted CO(2)Z ferrites have excellent potential in high-frequency antenna applications.

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Section: Semmentioning

confidence: 99%