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Sr<sup>2+</sup> Ion Substitution Enhanced Dielectric Properties of Co<sub>(2)</sub>Z Ferrites for VHF Antenna Substrate
oleh: Ji Wang, Kunlong Li, Gongwen Gan
Format: | Article |
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Diterbitkan: | MDPI AG 2022-09-01 |
Deskripsi
The effect of Sr<sup>2+</sup> ions on the microstructure and high frequency properties of 2.5 wt% Bi<sub>2</sub>O<sub>3</sub> added to Co<sub>(2)</sub>Z hexaferrites (3Ba<sub>(1-x)</sub>Sr<sub>x</sub>O•2CoO•12Fe<sub>2</sub>O<sub>3</sub>, 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 Sr<sup>2+</sup> ions, thereby increasing the miniaturisation factor, which enables a size reduction in a long frequency range. Slight changes to saturation magnetisation (<i>M</i><sub>s</sub>) and coercivity (<i>H</i><sub>c</sub>) were observed, i.e., the saturation magnetisation (<i>M</i><sub>s</sub>) decreased from 39.99 to 38.11 emu/g, and coercivity (<i>H</i><sub>c</sub>) increased from 59.05 to 65.21 Oe when <i>x</i> increased from 0.0 to 0.6. Meanwhile, ε′ increased from approximately 8 to 12, indicating the invariability in <i>μ</i>′. In addition, the processed materials exhibit relatively low magnetic loss and dielectric loss (magnetic loss tan<i>δ</i><sub>μ</sub> ≈ 0.08 and dielectric loss (tan<i>δ</i><sub>ε</sub> ≈ 0.007)). These results indicate that the substituted CO<sub>(2)</sub>Z ferrites have excellent potential in high-frequency antenna applications.