Effects of Zn substitution on high-frequency properties of Ba1.5Sr1.5Co2-xZnxFe22O41 hexaferrites

Abstract

Abstract Ba1.5Sr1.5Co2-xZnxFe22O41(x\xa0=\xa00,0.4,0.8,1.2,1.6,2.0) hexaferrites substituted by Zn were prepared via conventional solid-state reaction. The influences of Zn substitution content on phase formation, microstructure, and magnetic properties, especially high-frequency magnetic properties, were systematically investigated. Results indicate that, when sintering temperature is 1200\xa0°C, pure ferrite phase of Co2Z is formed, and Zn2+ is successfully incorporated into the lattice. Appropriate amount of Zn substitution can improve the densification and saturation magnetization ( M s ) of Z-type ferrite, thereby effectively promoting permeability. However, due to limitations of Snoek s law, cut-off frequency is found to be reduced with Zn substitution. For x\xa0=\xa00.4, the sample exhibits both high permeability (up to 22.49) and high cut-off frequency (~900\xa0MHz), with Snoek constant ( μ i − 1 ) × f r reaching 19.337\xa0GHz. Furthermore, magnetic loss for the sample with x\xa0=\xa00.4 is found to be low. It is anticipated that this material will have extensive application prospects for miniaturization and high frequency antenna applications.