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兰州大学机构库  > 物理科学与技术学院  > 期刊论文
题名: Room Temperature Ferromagnetism in Vacuum-Annealed CoO Nanospheres
作者: Yang, GJ; Gao, DQ(高大强); Shi, ZH; Zhang, ZH; Zhang, J; Zhang, JL; Xue, DS(薛德胜)
收录类别: SCIE ; EI
出版日期: 2010-12-23
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
卷号: 114, 期号:50, 页码:21989-21993
出版者: AMER CHEMICAL SOC
出版地: WASHINGTON
英文摘要: Single-crystalline CoO nanospheres with the size distribution between 40 and 250 nm were prepared by a solvothermal method. Magnetic measurements indicate that the vacuum-annealed samples show room temperature ferromagnetism except for the CoO nanospheres of 250 nm, which still exhibit paramagnetism after being postannealed in vacuum atmosphere (10(-3) Pa) at 250 degrees C as others. The saturation magnetization of all postannealed samples monotonically increases with the decrease of nanosphere diameter. No other impurity phases are observed for the postannealed samples, indicating that the revealed ferromagnetism is an intrinsic property. The fitted XPS results of O 1s spectra indicate that the variations of oxygen vacancies concentration are consistent with the variations of saturation magnetization for the vacuum-annealed samples, suggesting that the formed oxygen vacancies at the surface of the CoO nanospheres during the vacuum-annealing process account for the observed ferromagnetism.
作者部门: [Yang, Guijin ; Gao, Daqiang ; Shi, Zhenhua ; Zhang, Zhaohui ; Zhang, Jing ; Zhang, Jinlin ; Xue, Desheng] Lanzhou Univ, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Peoples R China
通讯作者: Xue, DS (reprint author), Lanzhou Univ, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Peoples R China.
学科分类: Chemistry; Science & Technology - Other Topics; Materials Science
文章类型: Article
所属项目编号: National Science Fund for Distinguished Young Scholars [50925103] ; Chinese Ministry of Education [309027] ; National Nature Science Foundation of China [11034004]
所属项目名称: 国家自然科学基金项目 ; 国家杰出青年科学基金项目 ; 教育部科学技术研究重大项目
项目资助者: NSFC ; MOE
语种: 英语
DOI: 10.1021/jp106818p
ISSN号: 1932-7447
WOS记录号: WOS:000285236800015
EI记录号: 20110813682730
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/105126
Appears in Collections:物理科学与技术学院_期刊论文

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Recommended Citation:
Yang, GJ,Gao, DQ,Shi, ZH,et al. Room Temperature Ferromagnetism in Vacuum-Annealed CoO Nanospheres[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2010,114(50):21989-21993.
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