Coexistence of layered and cubic rocksalt structures with a common oxygen sublattice in Li1.2Mn0.4Fe0.4O2 particles:: A transmission electron microscopy study

被引：41
作者：
Kikkawa, Jun [1 ]
Akita, Tomoki [1 ]
Tabuchi, Mitsuharu [1 ]
Shikano, Masahiro [1 ]
Tatsumi, Kuniaki [1 ]
Kohyama, Masanori [1 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Res Inst Ubiquitous Energy Devices, Osaka 5638577, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 10期
关键词：
D O I：
10.1063/1.2931002
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Local crystal structures associated with nanoscale variations of the concentration ratio of Fe ions to Mn ions in each single Li1.2Mn0.4Fe0.4O2 particle have been studied by nanobeam electron diffraction, high-resolution transmission electron microscopy, and electron energy-loss spectroscopy combined with scanning transmission electron microscopy. We have found the direct evidence that the Li1.2Mn0.4Fe0.4O2 particle is comprised of Mn-rich nanodomains with the layered rocksalt structure and Fe-rich nanodomains with the cubic rocksalt structure featured by the cation short-range order, within a common oxygen lattice framework of the cubic close-packed structure. Possible oxygen-centered octahedra in the present material are suggested. We discuss both origin and stability of the chemical-nanodomain structure. (C) 2008 American Institute of Physics.
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页数：10
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