Preparation and properties of CaO-added Mn-Zn ferrite ceramic

In the present work, spinel ferrite Mn0.76Zn0.24Fe2O4 were fabricated at the presence of the 0, 0.15, 0.30, 0.45 wt% CaO addition. The synthesis of Mn-Zn ferrites was accomplished using solid-state reaction of oxidative powders. The samples were created by sintering the powdered synthetic spinel. The findings show that any Fe2O3 that persisted after calcination at 1100 °C vanished after further sintering at 1250 °C, and all of the spinel structure-related diffractions in the X-ray diffraction (XRD) patterns were found. The scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analyses indicated the well-dispersed metallic cations in the spinel structure and solution of Ca ions. Theoretical density of sintered sample was improved by CaO addition, and a maximum value 96.2 % of theoretical density was obtained with addition of 0.30 wt% CaO. Increasing CaO content from 0 to 0.30 wt% causes increasing the saturation magnetization (Ms) from 34.6 to 42.4 emu/g in terms of the substitution of Ca2+ cations in the tetrahedral sites. Further increasing of CaO to 0.45 wt% causes decreasing Ms to 33.4 emu/g as a result of octahedral occupation of Ca2+ cations.