Annealing temperature on the microstructure and magnetic properties of magnesium–cobalt ferrite prepared by sol-gel self-propagating method

In this paper, sol-gel self-propagation is used as the experimental method, and glucose is used as the complexing agent to prepare magnesium–cobalt ferrite (Mg_0.1Co_0.9FeO₄). In the experiment, the annealing temperature of the sample is changed to study the annealing temperature on the ferrite. The influence of the microstructure and magnetic properties. In order to explore the samples, (X-ray diffractometer) XRD, (Fourier infrared spectrometer) FTIR, (scanning electron microscope) SEM and (vibrating sample magnetometer) VSM are usually used to characterize the sample. The characterization results of the samples are analyzed to prove the changes in the microstructure and magnetic properties. There are several obvious diffraction peaks in the XRD diffraction patterns of the five samples. Analysis of the positions of the diffraction peaks can prove that the prepared samples have a pure phase spinel structure. In the Fourier infrared spectroscopy, there is an obvious absorption peak around 580 cm⁻¹. The presence of this absorption peak can also prove that the sample has a spinel structure. The morphology of the sample in the SEM photograph of the sample is round or elliptical, and the particle distribution is obvious, and the size is 100 ~ 200 nm. Vsm tested the magnetic properties of the samples. On the hysteresis loop of each sample, can see that the saturation magnetization and the residual magnetization of the sample reached the maximum when the annealing temperature was 500 °C. When the annealing temperature was 600 °C the coercive force and magnetic susceptibility of the sample reached maximum.