Structural and magnetic properties of Sr_0.15Ca_0.3La_0.55Fe_11.65-xCo _0.35Zn_xO₁₉ ferrites synthesized through the ceramic process

In this study, Zn2+- substituted Sr0.15Ca0.3La0.55Fe11.65-xCo0.35ZnxO19 (0 <= x <= 0.15) ferrites were synthesized by the ceramic method. The effects of Zn2+ substitution on the structural and magnetic performance of samples were studied. The X-ray diffraction results show that ferrite samples with the high purity M-type phase can be obtained when the substitution amount of Zn2+ is x = 0-0.1. Further increasing the Zn content to x = 0.15, the impurity soft magnetic phase of ZnFe2O4 is detected, which harms the hard magnetic properties. The Mossbauer results show that Zn2+ ions enter the crystal lattice of the M-type phase and solely occupy the 4f(1) site, thereby promoting the conversion of Fe2+ to Fe3+ at the 2a position. It is observed that the particle size of the sintered samples slightly increases as x increases from 0 to 0.1, but decreases when x = 0.15. Ultimately, we achieved an optimal magnetic performance with the highest maximum energy product of 5.75 MGOe, which is highly competitive within the ferrite family.