Study On Doping And Performance Of BiFeO₃

Multiferroic material is a widely used magnetic material, and has been widespread in recent years. As a multifunctional material, multiferroic material has ferromagnetism, ferroelectricity and ferroelasticity. It has very strong temptation for the pursuit of device miniaturization of the modern society.As a multiferroic material, BiFeO3 material’s performance is one of the most prominent. At room temperature, BiFeO3 material show ferroelectricity and weak anti-ferromagnetism. However, BiFeO3 material, itself, still has many defects. It is difficult to measure the ferroelectricity for its large leakage conductance, and precisely because Bi3+ is unstable and volatile. In the process of samples prepared by solid phase method, the nature that Bi3+ is easy to volatile will not only lead to the formation of oxygen vacancies, but also make Fe3+become Fe2+ by valence decline. And it will also lead to the decrease in the strength of the remanent polarization. When in room temperature, it is also difficult to measure the weak anti-ferromagnetic of BiFeO3 material.As a perovskite material of ABO3, BiFeO3 material is touted on doping of A-site and B-site in recent years. The main methods of doping contain A-site doping, B-site doping and A-site, B-site co-doping.In order to strengthen the ferroelectric and ferromagnetic, reduce leakage conductance, we use two ways to doping A-site and B-site of BiFeO3 material. And it can enhance ferroelectricity and ferromagnetism.(1)Doping Pr on A-site, Co on B-site by sol-gel method and prepare single-phase samples of BixPr1-x FeyCo1-yO3, do the test of XRD, SEM, ferroelectric properties, ferromagnetic properties and compare with BiFeO3.(2)Doping Ba on A-site, Mn on B-site by sol-gel method and prepare single-phase samples of BixBa1-xFeyMn1-yO3, do the test of XRD, SEM, ferroelectric properties, dielectic properties and compare.