期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 466, 期 1-2, 页码 26-30出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.11.054
关键词
Diluted magnetic semiconductor; Room temperature ferromagnetism
资金
- National 973 project of China [2006CB921606]
- National Science Foundation of China [10574049]
- ministry of the National Education [20060487011]
The microstructure and magnetic properties have been investigated systematically for Sn1-xMnxO2 (0 <= x <= 7%) nanoparticles synthesized by chemical co-precipitation method. The X-ray diffraction reveals that all samples are pure rutile-type tetragonal phase and the cell parameters a and c decrease monotonously with the increase of Mn content, indicated that Mn ions substitute into the lattice of SnO2. X-ray photoelectron suggests that Mn ions behave as the mixture state of Mn3+ and Mn4+ in samples. Magnetic investigations demonstrate that magnetic properties strongly depend on both the sintering temperature and doping content. No ferromagnetism is observed for samples sintered at high temperature (T-s = 800 degrees C), irrespective of the doping content. In contrast, the samples sintered at low temperature (T-s = 450 degrees C) possess room temperature ferromagnetism when the doping content is below 5%. A plausible explanation of the magnetic properties is presented in terms of bound magnetic polaron model. (C) 2007 Elsevier B.V. All rights reserved.
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