Mn-Zn ferrites doped with different contents of Sm3+and Gd3+ions were prepared by sol-gel auto-combustion method and characterized byFourier transform infrared spectroscopy(FTIR),thermogravimetricanalysis(TG),X-ray diffraction (XRD),scan-ning electron microscopy (SEM)andvibrating sample magnetometer(VSM). When samples werecalcinedin a relativelylow tem-perature below 1100 °C, secondary phases (α-Fe2O3) could be identified. Therefore, in order to acquire pure and better crystallinity, the suitablecalcining temperature of powders was selected at 1200 °C. It was also found that all the samples consisting of ferrite phases of typical spinel cubic structure and average crystallite sizes between 31.5 and 38.2 nm were obtained after calciningat 1200oC for 4 h. The lattice parameters increased almost linearly with increasing Sm content. A dense microstructure was obtained after sintering at 1250 °C for 4 h. Through the analysis of magnetic properties, hysteresis loops for all the sampleswere narrow with low values of coer-civityand retentivity, indicatingthe paramagnetic nature of these samples. And saturation magnetizationMsstrongly dependedon the type of additive to reach a maximum of 47.99 emu/g forx=0.015, which showeda great promise for hyperthermia applications.
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