| BiFeO3 is the single-phase ABO3 ceramic oxide material at room temperature which has antiferromagnetic and ferroelectric at the same time. The special feature of BiFeO3 makes it widely used in filter, infrared detection, sensors, memory devices, and so on. And there are a large number of oxygen vacancies in BiFeO3 material, making pure phase material is very difficult, one of the main reason is that there are a lot of Fe3+ change into Fe2+, resulting in a large leakage current, unable to form saturated polarization, also limits the development. It’s antiferromagnetic comes from spiral structure, and the antiferromagnetic has greatly limits its application,how to make magnetic available is the key.The research uses hydrothermal method with KOH and NaOH,Li OH as mineralizer and Sm of doping to make BiFeO3 powder,and analyzes it’s shape, structure,phase transition,ferromagnetic to show the macroscopic magnetic,results are as follows:Using KOH as the mineralization can enhance it’s magnetism, with the increase of the concentration of KOH,the magnetic enhanced,the action mechanism can be explained by magnetic polaron model. Using NaOH as mineralizer,it’s magnetic decreases with the increase of the concentration of NaOH. Using KOH and NaOH in a certain range concentration can make pure Bi FeO3,while LiOH cannot. Doping Sm can enhance the magnetic,and Sm3 + to magnetic is stronger than KOH and NaOH. |
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