Chemical Research in Chinese Universities ›› 2013, Vol. 29 ›› Issue (2): 210-213.doi: 10.1007/s40242-013-2159-y

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Preparation, Structure and Magnetic Properties of Lithium Substituted NiO by Molten Salt Method

DU Fei1, BIE Xiao-fei1, BIAN Xiao-fei2, HU Fang3, CHEN Gang1, WANG Chun-zhong1, WEI Ying-jin1   

  1. 1. Key Laboratory of Advanced Batteries Physics and Technology, Ministry of Education, College of Physics, Jilin University, Changchun 130012, P. R. China;
    2. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, P. R. China;
    3. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China
  • Received:2012-04-23 Revised:2012-06-25 Online:2013-04-01 Published:2013-03-20
  • Supported by:

    Supported by the Special Funds for Major National Basic Research Project of China(No.2009CB220104), the National Natural Science Foundation of China(No.11004073) and the Research Fund for the Doctoral Program of Higher Education of China(New Teacher)(No.20090061120020) and Partially Supported by the Development Program of Science and Technology of Jilin Province, China(No.201205035).

Abstract:

A typical Li+ substituted NiO compound, Li0.29Ni0.71O, was synthesized by molten nitrate method. The effects of Li+ substitution on the structure and magnetic properties of NiO were investigated. X-Ray diffraction(XRD), scanning electron microscope(SEM) and high-resolution transmission electron microscope(HRTEM) analyses confirm the cubic structure of Li0.29Ni0.71O, with a primary particle size of 150 nm. Analysis of the Ni X-ray photoelectron spectroscopy(XPS) shows the transformation from Ni2+ to Ni3+ induced by Li+ substitution. Two magnetic transitions were observed at 225 and 55 K which were assigned to the ferrimagnetic ordering and spin glass transition, respectively. The different magnetic behavior with respect to that of NiO was attributed to the break of superexchange interaction Ni2+-O-Ni2+ and the formation of different spin clusters after non-magnetic Li+ doping.

Key words: NiO, Magnetic property, Substitution effect