高等学校化学研究 ›› 2013, Vol. 29 ›› Issue (2): 210-213.doi: 10.1007/s40242-013-2159-y
DU Fei1, BIE Xiao-fei1, BIAN Xiao-fei2, HU Fang3, CHEN Gang1, WANG Chun-zhong1, WEI Ying-jin1
DU Fei1, BIE Xiao-fei1, BIAN Xiao-fei2, HU Fang3, CHEN Gang1, WANG Chun-zhong1, WEI Ying-jin1
摘要:
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.