Synthesis, structure, hyperthermia behavior and magnetic properties of Mn–Zn particles prepared by a new method of ball-milling and heating

This paper has focused upon the synthesis, structure, hyperthermia and magnetic properties of the Mn–Zn particles prepared by a new combined ball milling and heating process. Normally, it is required that the partial pressure in the final sintering be controlled by the Mn–Zn ferrite preparation, yet in the current method the ferrite has been obtained with a nearly high purity. The nanocrystalline Mn_1-xZn_xFe₂O₄ (x = 0.25, 0.5 and 0.75) powders were characterized using the X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Raman spectrometer (RS), Fourier-transform infrared spectrometer (FTIR), vibrating sample magnetometer (VSM) and specific absorption rate (SAR). The FTIR and Raman data confirmed the result of the XRD data and the presence of spinel structure. The zinc content affected the band lengths, cation distributions and particle sizes. The structural results revealed that as the Zn concentration increases, the particle size decreases and the other cations tend to go to the octahedral sites. The results demonstrated that the highest level of SAR corresponds to the efficient and non-toxic Mn_0.75Zn_0.25Fe₂O₄ due to the suitable particle size and noticeable saturation magnetization.