Large polarization and enhanced magnetic properties in BiFeO3 ceramic prepared by high-pressure synthesis

被引：75
作者：
Su, W. N. [1 ]
Wang, D. H.
Cao, Q. Q.
Han, Z. D.
Yin, J.
Zhang, J. R.
Du, Y. W.
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 09期
关键词：
D O I：
10.1063/1.2776864
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The BiFeO3 ceramics were prepared by sol-gel method (BFO-1) and high-pressure synthesis (BFO-2). X-ray diffraction showed that these ceramics are almost of single phase. It is difficult to observe a ferroelectric loop of BFO-1 even at an electric field of 6 kV/cm. Compared to BFO-1, the high-pressure synthesized one has higher resistivity, higher density, and better crystallization. Under an applied electric field of 120 kV/cm, the values of remanent polarization and the coercive field are 46 mu C/cm(2) and 73 kV/cm, respectively. At room temperature, a magnetic hysteresis loop with enhanced magnetization can be observed in BFO-2.
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