Influence of Fe_2O_3 on structural and magnetic properties of LaFeO_3/Fe_2O_3 and Mn_2O_3/Fe_2O_3 magnetic nano-composites

摘要

LaFeO_3/Fe_2O_3 and Mn_2O_3/Fe_2O_3 magnetic nano-composites have been prepared by a modified polyacrylamide gel route. The XRD result indicates the formation of LaFeO_3/Fe_2O_3 and Mn_2O_3/Fe_2O_3 nano-composites. Scanning electron microscope (SEM) observation shows that the LaFeO_3/Fe_2O_3 particles appear to be regularly spherical in shape and highly uniform in size with a diameter of ~ 80 nm, while the Mn_2O_3/Fe_2O_3 sample exhibits a relatively broad particle size distribution with an average particle size centered around 20-60 nm. Result of vibrating sample magnetometer (VSM) of LaFeO_3/Fe_2O_3 magnetic nano-composites revealed that coercivity values decreased with the increase sintering temperature. However, the coercivity values of Mn_2O_3/Fe_2O_3 magnetic nano-composites appear to an anomaly phenomenon.