화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.91, No.1, 342-345, 2008
Reassessment of the electronic-conduction behavior above the verwey-like transition of Ni2+- and Al3+-Doped LiMn2O4
The electronic conduction behavior above the Verwey-like transition temperature (T-v) of Ni2+- and Al3+-doped LiMn2O4 has been reassessed. The nonadiabatic small-polaron model is adopted to assess the conduction mechanism. The Jahn-Teller distortion and short-range ordering are found to play a role in the variations of the lattice parameter and conduction behavior above T-v. It is also found that the effect of the dopant content on the activation energy is minor but is significant on the preexponential factor during the hopping process above T-v. In simultaneously comparing the effects of the dopants with quite different chemistry on the electronic-conduction behavior in Ni2+- and Al3+-doped LiMn2O4, it indeed provides a deep sight into understanding the fundamental conduction mechanism above T-v.