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 (Tv) 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 Tv. 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 Tv. 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 Tv.
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Document Type: Research Article
Affiliations: Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 70101, ROC
Publication date: January 1, 2008