Structural, morphological, dielectric and magnetic properties of Zn‐Zr co‐doping yttrium iron garnet

Abstract In this study, yttrium iron garnet co‐doped with Zn and Zr atoms with a chemical formula Y ₃ Zn _x Zr _x Fe _{(5−2 x )} O ₁₂ ( x = 0.0‐0.3) has been successfully prepared by the solid‐state reaction method. The effects of doping concentration on the microstructure, crystal structure, magnetic properties, and dielectric properties of Y ₃ Zn _x Zr _x Fe _{(5−2 x )} O ₁₂ were investigated. The microstructure analysis indicates that co‐doping of YIG with Zn and Zr can effectively reduce the grain size of the ceramic. The crystal structure results reveal that the doping concentration of Zn–Zr has substantial influence on the lattice parameters of YIG, such as, increases the lattice constant, crystal cell size, and interplanar spacing. However, the second phase of ZrO ₂ appears once x ≥ 0.15. Additionally, the dielectric properties of YIG ferrite can be regulated using this Zn–Zr co‐doping method. Zn–Zr co‐doping can improve the dielectric stability and reduce the dielectric loss at high temperature. The magnetization measurement shows that the saturation magnetization is stabilized at x < 0.15, and the magnetic loss is decreased with the increase in the doping concentration. Overall, the findings show that the ceramic with x = 0.1 exhibits better properties included high saturation magnetization (24.607 emu/g), low magnetic loss (0.0025 @ 1 MHz), and relatively low dielectric loss (496 @ 400°C).