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Reassessment of the Electronic‐Conduction Behavior above the Verwey‐Like Transition of Ni 2+ ‐ and Al 3+ ‐Doped LiMn 2 O 4
Author(s) -
Fang TsangTse,
Chung HanYang
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02148.x
Subject(s) - polaron , thermal conduction , condensed matter physics , doping , dopant , activation energy , materials science , jahn–teller effect , mineralogy , chemistry , ion , physics , electron , quantum mechanics , composite material , organic chemistry
The electronic conduction behavior above the Verwey‐like transition temperature ( T v ) of Ni 2+ ‐ and Al 3+ ‐doped LiMn 2 O 4 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 Ni 2+ ‐ and Al 3+ ‐doped LiMn 2 O 4 , it indeed provides a deep sight into understanding the fundamental conduction mechanism above T v .