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Structural Transition and Magnetic Property of Bi1-xYbxFeO3
Ya-nan Zheng,Yu-jie Wu*,Zhen-xing Qin,Xiao-jia Chen
Author NameAffiliationE-mail
Ya-nan Zheng Department of Physics, South China University of Technology, Guangzhou 510640, China  
Yu-jie Wu* Department of Physics, South China University of Technology, Guangzhou 510640, ChinaSchool of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China wyj9921@163.com 
Zhen-xing Qin Department of Physics, South China University of Technology, Guangzhou 510640, China  
Xiao-jia Chen Department of Physics, South China University of Technology, Guangzhou 510640, China  
Abstract:
Bi1-xYbxFeO3(0≤x≤0.2) powders have been synthesized using a sol-gel method. The X-ray diffraction data show a structural transition from the rhombohedral R3c phase to the orthorhombic Pnma phase between x=0.1 and 0.125, which should induce a ferroelectric- paraelectric transformation. The phase transition is also proven by the Raman spectroscopy. A moderate signal on magnetization appears to illustrate the enhancement of magnetization at the transformation boundary, which is suggested to be the destruction of the spin cycloid structure at low concentration. The appearance of antiferromagnetic ordering is proposed to account for the afterward reduction of the magnetization at high concentration.
Key words:  Multiferroics, Structural transition, Magnetic property
FundProject:
Bi1-xYbxFeO3的结构相变与磁性
郑亚男,吴玉洁*,秦振兴,陈晓嘉
摘要:
用溶胶-凝胶法制备了Bi1-xYbxFeO3(0≤x≤0.2)粉晶样品,并用X射线衍射光谱和拉曼光谱对其结构进行了研究. 结果表明, 在x=0.1~0.125, 发生了结构相变, 由菱形R3c结构变为正交Pnma结构,对应的应该是从铁电相到顺电相的转变. 在结构相变边界,磁化强度达到最大值. 其原因是在低浓度掺杂区域,随着Yb3+的掺杂浓度的增大,BiFeO3的自旋螺旋结构受到抑制,部分未被抵消的磁矩被释放出来,到了相变边界,自旋螺旋结构受到的抑制达到最大,磁矩被完全释放出来. 随着x的继续增大,磁化强度开始逐渐减小,这是由于逐渐形成了良好的反铁磁序排列.
关键词:  多铁材料,结构相变,磁性
DOI:10.1063/1674-0068/26/02/157-162
分类号: