Y和Cr共掺杂BiFeO_3陶瓷的多铁性能研究

采用固相反应法制备了Y_2O_3和Cr_2O_3共掺杂BiFeO3陶瓷,研究了Bi_(0.9)Y_(0.1)Fe_(1–x)Cr_xO_3(BYFC_x,x=0,0.002,0.004,0.006,0.008)陶瓷的多铁性能。XRD分析表明,经850℃烧结的BYFC_x陶瓷形成了三方钙钛矿结构固溶体。随着Cr掺杂量增加,BYFC_x陶瓷在室温下的铁磁性能和铁电性能提高明显。当x为0.004时,所制陶瓷的铁磁性能最好,剩余磁化强度Mr为0.23A·m~2/kg,饱和磁化强度Ms为3.15A·m~2/kg,矫顽力Hc为2.3kA/m。Mr、Ms和Hc随着Cr掺杂量的增加先增大后减小。

Multiferroic properties of Y and Cr codoped BiFeO3 ceramics

Y2O3 and Cr2O3 codoped BiFeO3 ceramics were prepared by solid-state reaction method. The multiferroic properties of Bi0.9Y0.1Fe1–xCrxO3 (BYFCx, x=0, 0.002, 0.004, 0.006, 0.008) ceramics were investigated. XRD analysis results indicate that the solid solutions with rhombohedral perovskite structure are formed when the BYFCx ceramics are sintered at 850 ℃. The ferroelectric and ferromagnetic properties of BYFCx ceramics are improved significantly at room temperature when the Cr doping amount increase. The remanent magnetization intensity (Mr), the saturation magnetization intensity (Ms) and the coercivity (Hc) of the ceramics increase firstly and then decrease with the increase of the Cr doping amount. The highest value of Mr, 0.23 A·m2/kg, together with the highest value of Ms and Hc, 3.15 A·m2/kg and 2.3 kA/m, are obtained when x = 0.004.