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改善BiFeO3性能的有效途径,就是对其进行掺杂或与其他钙钛矿材料复合固熔。由于稀土元素与Bi的化合价相同,较容易取代Bi离子,而且Mn,Cr的掺杂又可提高BiFeO3的磁性。通过掺杂,采用溶胶-凝胶法合成了Bi1-xLaxFe0.8Mn0.2O3材料(x=0.3,0.35,0.4),用XRD测试了其晶体结构,通过原子力显微镜测试其表面形貌。通过对复合陶瓷(Bi1-xLaxFe0.8Mn0.2O3)的磁性能、介电性能和磁电耦合性能的研究,作出复合陶瓷的M-H磁滞回线。结果显示:随着La掺杂量的增加,原胞体积变小,x=0.4时,颗粒进一步细化;磁滞回线显示,随着La掺杂量的增加,剩磁逐渐增大,磁性能得到一定的改善,磁电耦合性能进一步提高,但介电性能有所减弱。
An effective way to improve the performance of BiFeO3 is to doping it or compounding with other perovskite materials. Due to the same valence of rare earth element and Bi, it is easier to replace Bi ions, and the doping of Mn and Cr can improve the magnetic properties of BiFeO3. Bi1-xLaxFe0.8Mn0.2O3 (x = 0.3,0.35,0.4) was synthesized by sol-gel method. The crystal structure of Bi1-xLaxFe0.8Mn0.2O3 was tested by XRD. The surface morphology of the samples was tested by atomic force microscopy. The M-H hysteresis loops of composite ceramics were obtained by studying the magnetic properties, dielectric properties and magnetoelectric coupling properties of the composite ceramics (Bi1-xLaxFe0.8Mn0.2O3). The results show that with the increase of La doping volume, the volume of the original cell becomes smaller, and when x = 0.4, the particles are further refined. The hysteresis loop shows that the residual magnetism increases with the increase of La doping amount, Can get a certain improvement, further improve the magnetoelectric coupling performance, but the dielectric properties weakened.