Simultaneous control of electrical and magnetic properties of LaFeO3-δ nanoparticles by contact of ethanol gas

被引：15
作者：
Cao, Ensi [1 ,2 ]
Cui, Tingting [2 ]
Yang, Yuqing [2 ]
Zhang, Yongjia [2 ]
Hao, Wentao [2 ]
Sun, Li [2 ]
Peng, Hua [2 ]
机构：
[1] Taiyuan Univ Technol, Minist Educ, Key Lab Adv Transducers & Intelligent Control Sys, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, Coll Phys & Optoelect, Taiyuan 030024, Peoples R China
来源：
MATERIALS LETTERS | 2017年 / 190卷
基金：
中国国家自然科学基金;
关键词：
LaFeO3; Sol-gel; XPS; Magnetism; Ethanol; PHOTOCATALYTIC ACTIVITY;
D O I：
10.1016/j.matlet.2016.12.086
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
LaFeO3-delta nanoparticles were prepared by citric sol-gel method, which show Weak ferromagnetic (FM) behavior at room temperature with magnetization of 0.11 emu/g at 10 kOe. XPS indicates that La is rich at the surface region and Fe ions are in the mixed state of Fe3+ and Fe4+. The double exchange interaction of Fe3+-O2--Fe4+ between neighboring Fe3+ and Fe3+ ions would result in strengthened FM shell and weakened AFM core, which contribute to the observed FM behavior. The electrical arid magnetic properties are coupled by the formation of Fe4+ ions, which are mainly caused by oxygen adsorption at the surface region and by electrical valence compensation inside the core. Simultaneous control of electric resistance and magnetization has been achieved by contact of ethanol, which could react with the adsorbed oxygen at the surface region, leading to increased resistance and reduced magnetization. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：143 / 145
页数：3
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