用固相工艺制备了Bi6Fe2-xCoxTi3O18(BFCT-x,x=0,0.2,0.6,0.8,1.0,1.2,1.6,1.8,和2.0)多铁陶瓷样品,样品X射线谱分析发现,随着Co含量的增加,样品晶格常数出现了先增大后减小的变化.室温下,BFCT-0.6样品呈现出相对较高的饱和磁化强度,2Ms约为4.49 emu/g,BFCT-1.0具有最高的剩余磁化强度,2Mr约为0.89 emu/g.Co含量在0.2 x 1.2范围内,随着Co含量的增加样品顺磁—铁磁相变温度从752K降至372 K.小量的Co改善了样品的铁电性能,当x=0.6时样品样品的铁电性能最佳,随着含量增大样品铁电性能下降,但当x>1.2时样品的铁电性能又得到了改善.
【英文摘要】
Multiferroic materials have drawn increasing interest due to the coexistence of ferromagnetism(FM) and ferroelectricity(FE), which provides significant potentials for applications in spintronics, information storage, and sensors, etc. In this paper, the multiferroic Bi6Fe2-xCoxTi3O18(BFCT-x, x = 0–2.0) ceramics are prepared by the solid-state reaction.The BFCT-x samples belong to Aurivillius structure containing five perovskite layers clapped between two Bi-O layers.The lattice constants a, b, and c of BFCT...
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