掺杂Y^3＋对BiFeO3陶瓷电学性能的影响

Electrical properties of Y-modified BiFeO3 ceramics

BiFeO3是少数在室温下同时具有铁电性和磁性的材料之一，实验添加Y^3＋制备Bi1-xYxFeO3（x=0．05，0．1，0．15，0.2）陶瓷，研究了样品的相结构、微现形貌及电学性能。实验结果表明：所制备的陶瓷样品为斜方六面体结构；随Y^3＋添加量的增加，样品电容率增大，介电损耗先减小后增大；样品的剩余极化值Pr从0．132增大到0．160μC/cm^2。

Bismuth ferrite （BiFeO3） is an important multiferroic material, in which both electrical and magnetic ordering can coexist simultaneously. Crystal structure, microstructure and electrical properties of Yttrium （Y）-modified bismuth ferrite Bi1-xYxFeO3（x=0.05,0.1,0.15 and 0.2） ceramics were studied and compared with those of bismuth ferrite （BiFeO3）. The crystal structure of the samples was determined to be rhombohedral of R3c space group by X-ray diffxaction（XRD）. As the Y content increased, the dielectric constant of the ceramic samples increased. However, the loss tangent firstly decreased with increasing Y content, and then began to increase at x = 0.15. The remnant polarization of the ceramic samples was improved fromr 0.132μC/cm^2 to 0.16μC/cm^2.