Defect types and room temperature ferromagnetism in N-doped rutile TiO2 single crystals

被引：7
|
作者：
Qin Xiu-Bo [1 ,4 ]
Li Dong-Xiang [2 ]
Li Rui-Qin [2 ]
Zhang Peng [1 ]
Li Yu-Xiao [3 ]
Wang Bao-Yi [1 ]
机构：
[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China
[2] Anshun Univ, Sch Math & Phys, Anshun 561000, Peoples R China
[3] Zhengzhou Univ, Sch Phys Engn, Zhengzhou 450001, Peoples R China
[4] Chinese Acad Sci, Inst High Energy Phys, Div Nucl Technol & Applicat, Beijing 100049, Peoples R China
来源：
CHINESE PHYSICS B | 2014年 / 23卷 / 06期
基金：
中国国家自然科学基金;
关键词：
N doping; titanium vacancies; replacement of O with N atoms; ferromagnetism;
D O I：
10.1088/1674-1056/23/6/067502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The magnetic properties and defect types of virgin and N-doped TiO2 single crystals are probed by superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), and positron annihilation analysis (PAS). Upon N doping, a twofold enhancement of the saturation magnetization is observed. Apparently, this enhancement is not related to an increase in oxygen vacancy, rather to unpaired 3d electrons in Ti3+, arising from titanium vacancies and the replacement of O with N atoms in the rutile structure. The production of titanium vacancies can enhance the room temperature ferromagnetism (RTFM), and substitution of O with N is the onset of ferromagnetism by inducing relatively strong ferromagnetic ordering.
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收藏
页数：5
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