| The soft power Mn-Zn ferrite nanocrystal has been successfully synthesized by a simple synthesis - co-precipitation phase transformation. Its green body was sintered by different sintering process - the segmented sintering process and the traditional sintering process. The physical and magnetic properties of soft power Mn-Zn ferrite nanocrystal and sintered compacts were measured by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission Electron Microscope (TEM) and vibrating sample magnetometer (VSM), respectively.The properties of Mn-Zn ferrite crystal show that: Mn-Zn ferrite nanocrystal can be prepared by co-precipitation phase transformation, with the pH of the precursor solution changed from 11 to 13. The optimal properties of Mn-Zn ferrite crystal can be synthesized, with the pH is 13, and the grain size is 20nm.To the traditional sintering process, the results show that: the density and grain size of sintered compacts increase with the rising of the sintering temperature and the magnetic properties of sintered compacts also increase with the rising of the sintering temperature. The better sintered temperature is 950℃, its density and grain size are 4.53g/cm~3 and 57.7nm, respectively. Additionally, from the fractured surface of sintered samples, it can be seen that the grain grows abnormal, with big grain.To the segmented sintering process, the results show that: the density and grain size of sintered compacts increase with the rising of the sintering temperature and the magnetic properties of sintered compacts also increase with the rising of the sintering temperature. The optimal sintered temperature is 900℃, its density and grain size are 4.8245g/cm~3 and 54.9nm, respectively. Additionally, from the fractured surface of sintered samples, it can be seen that the grain grows very well with small grain size and homogeneous distribution.
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