Effect of Pr, Mn doping on the structure and properties of BiFeO_3

摘要

The powders of Bi_(1-x)Pr_xFeO_3 = 0, 0.05, 0.1) and Bi_(0.95)Pr_(0.05)Fe_(1-y)Mn_yO_3 (y = 0.05, 0.1) were prepared by hydrothermal method. The effects of Pr and Mn doping content on the structure, morphology, magnetic, and photocatalytic properties of BiFeO_3 (BFO) have been studied. X-ray diffraction (XRD) demonstrated that the compounds are distorted rhombohedral perovskite structure without any other heterogeneity and structural transition. Field emission scanning electron microscope (FESEM) reflected that the surface of compounds is a dense, agglomerated sphere, and the morphology changes with the addition of Pr, Mn. Energy spectrum analysis (EDS) shows that the Bi_(0.95-)Pr_(0.05)Fe_(0.95)Mn_(0.05)O_3 sample is mainly composed of 5 elements (Bi, Fe, O, Pr, Mn), and the atomic ratio matches the formula well. Integrating the vibrating sample magnetometer (VSM) into the physical property measurement system (PPMS-9) shows that the introduction of Pr~(3+)and Mn~(2+) ions can enhance the magnetic properties of BFO at room temperature. In addition, doping with Pr~(3+)and Mn~(2+) ions can improve the photocatalytic performance of BFO, and with the increase of Mn~(2+) concentration, the photocatalytic performance of BFO first rises and then decreases, and its catalytic performance is getting better and better.