Frenkel-Defect-Mediated Chemical Ordering Transition in a Li-Mn-Ni Spinel Oxide

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Using spinel-type Li(Mn1.5Ni0.5)O-4 with two different cations, Mn and Ni, in the oxygen octahedra as a model system, we show that a cation ordering transition takes place through the formation of Frenkel-type point defects. A series of experimental results based on atomic-scale observations and insitu powder diffractions along with abinitio calculations consistently support such defect-mediated transition behavior. In addition to providing a precise suggestion of the intermediate transient states and the resulting kinetic pathway during the transition between two phases, our findings emphasize the significant role of point defects in ordering transformation of complex oxides.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2015-06
Language
English
Article Type
Article
Citation

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.54, no.27, pp.7963 - 7967

ISSN
1433-7851
DOI
10.1002/anie.201502320
URI
http://hdl.handle.net/10203/200893
Appears in Collection
MS-Journal Papers(저널논문)
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