期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 27, 页码 7963-7967出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502320
关键词
defects; electron microscopy; phase transitions; solid-state structures; spinel phases
资金
- National Research Foundation of Korea (NRF) [2014R1A4A1003712, 2013R1A1A2005243, 2010-0028973]
- KBSI [T34429]
- Nuclear R&D Program through the NRF [2012M2A2A6002461]
- National Research Foundation of Korea [2013R1A1A2005243, 2010-0028973] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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