Probing the role of cation vacancies on the ferromagnetism of La-doped BiFeO3 ceramics
Probing the role of cation vacancies on the ferromagnetism of La-doped BiFeO3 ceramics
复制标题
探讨阳离子空位对La掺杂BiFeO3陶瓷铁磁性的作用
DOI：
10.1016/j.jmmm.2017.10.082
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发表时间：
2018-03-01
影响因子：
2.7
通讯作者：
Ye, Bangjiao
中科院分区：
文献类型：
--
作者：
Ge, Wenna;Rahman, Azizur;Ye, Bangjiao
用正电子湮没寿命谱研究了单相复铁性Bi1-xLaxFeO3(x=0.00，0.10，0.20，0.30，0.40)陶瓷的磁性，考察了阳离子空位对其磁性的影响。正电子寿命测量和正电子寿命的密度泛函理论计算证实了Bi和Fe空位的存在。观察到当x>；0.20时，Bi单空位逐渐消失，开始出现一些较大的空位团。磁性能测试表明，当x&gT；0.20时，样品的剩余磁化强度大大增加。研究发现，磁化强度的增强不仅是由于自旋摆线结构的抑制，而且阳离子缺陷的变化也起到了一定的作用。(C)2017爱思唯尔B.V.保留所有权利。
Single-phase multiferroic Bi1-xLaxFeO3 (x = 0.00, 0.10, 0.20, 0.30, and 0.40) ceramics were studied by positron annihilation lifetime spectroscopy and the effect of the cation vacancies on the magnetism were investigated. Positron lifetime measurements and density-functional theory calculation of positron lifetimes identified the presence of Bi and Fe vacancies. It was observed that when x > 0.20 the Bi monovacancies disappeared gradually and some larger vacancy clusters begin to appear. Magnetic property measurements showed that the remnant magnetization increases greatly when x > 0.20. It is found that the enhanced magnetization is not only due to the suppressed spin cycloid structure, but the variation of cation defects also contributes. (C) 2017 Elsevier B.V. All rights reserved.