Find in Library

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)Sr_xO•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 (<i>M</i>_s) and coercivity (<i>H</i>_c) were observed, i.e., the saturation magnetisation (<i>M</i>_s) decreased from 39.99 to 38.11 emu/g, and coercivity (<i>H</i>_c) 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>_μ ≈ 0.08 and dielectric loss (tan<i>δ</i>_ε ≈ 0.007)). These results indicate that the substituted CO₍₂₎Z ferrites have excellent potential in high-frequency antenna applications.