The abnormal electrical and optical properties in Na and Ni codoped BiFeO3 nanoparticles

被引：27
作者：
Xu, Xunling [1 ]
Liu, Weifang [1 ]
Zhang, Hong [1 ]
Guo, Minchen [1 ]
Wu, Ping [1 ]
Wang, Shouyu [2 ,3 ]
Gao, Ju [3 ]
Rao, Guanghui [4 ]
机构：
[1] Tianjin Univ, Sch Sci, Tianjin Key Lab Low Dimens Mat Phys & Preparing T, Tianjin 300072, Peoples R China
[2] Tianjin Normal Univ, Coll Phys & Mat Sci, Tianjin 300074, Peoples R China
[3] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[4] Guilin Univ Elect Technol, Dept Informat Mat Sci & Engn, Guilin 541004, Guangxi, Peoples R China
来源：
JOURNAL OF APPLIED PHYSICS | 2015年 / 117卷 / 17期
基金：
中国国家自然科学基金;
关键词：
DOPED BIFEO3; MULTIFERROIC PROPERTIES; MAGNETIC-PROPERTIES; MECHANISM; CONDUCTION;
D O I：
10.1063/1.4919822
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Bi0.97Na0.03Fe1-xNixO3 (x = 0, 0.005, 0.01, 0.015) nanoparticles are prepared via a sol-gel method. Weak ferromagnetism and exchange bias phenomenon without field cooling are observed in the samples. The oxygen vacancy concentration and leakage current density are increased with increasing the Ni content. However, with the increase of Ni content, the band gap of Bi0.97Na0.03Fe1-xNixO3 nanoparticles first decreases and then increases. To explain the abnormal phenomenon, the interplay of oxygen vacancy donor and hole acceptor is analyzed and a phenomenological qualitative model based on the electronic energy band is proposed. Additionally, the threshold switching behavior appears in Bi0.97Na0.03Fe1-xNixO3 samples with x = 0.01, 0.015 and the effect is qualitatively explained by introducing a conducting channel model based on the high-density mobile charges. (C) 2015 AIP Publishing LLC.
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页数：8
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