title: Frenkel-Defect-Mediated Chemical Ordering Transition in a Li-Mn-Ni Spinel Oxide.
abstract: Using spinel-type Li(Mn(1.5)Ni(0.5) )O4 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 in situ powder diffractions along with ab initio 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.
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-338 (Korea) https://sites.google.com/site/atomicscaledefects/
authors.forename: Hyewon
authors.initials: H
authors.lastname: Ryoo
authors.affiliation: KAIST Analysis Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-338 (Korea).
authors.forename: Hyung Bin
authors.initials: HB
authors.lastname: Bae
authors.affiliation: Korea Basic Science Institute, Daejeon 305-806 (Korea).
authors.forename: Young-Min
authors.initials: YM
authors.lastname: Kim
authors.affiliation: Korea Basic Science Institute, Daejeon 305-806 (Korea).
authors.forename: Jin-Gyu
authors.initials: JG
authors.lastname: Kim
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353 (Korea).
authors.forename: Seongsu
authors.initials: S
authors.lastname: Lee
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-338 (Korea) https://sites.google.com/site/atomicscaledefects/. nalphates@gmail.com, sychung@kaist.ac.kr.
authors.forename: Sung-Yoon
authors.initials: SY
authors.lastname: Chung
keywords: defects; electron microscopy; phase transitions; solid-state structures; spinel phases