Local lattice distortion caused by short range charge ordering in LiMn 2O4

Katsuaki Kodama, Naoki Igawa, Shin Ichi Shamoto, Kazutaka Ikeda, Hidetoshi Oshita, Naokatsu Kaneko, Toshiya Otomo, Kentaro Suzuya

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

We have performed powder neutron diffraction on 7Li-enriched sample of LiMn2O4 at 300 K. The crystal structure determined by Rietveld analysis is a cubic spinel with space group of Fd3m in which all Mn atoms are crystallograghically equivalent, consistent with many preceding studies. However, the atomic pair distribution function (PDF) of this compound can not be fitted by the cubic structure with space group of Fd3m satisfactorily, and it can be reproduced by the orthorhombic structure with Fddd. It corresponds with the structure of charge ordered phase below about 260 K, indicating a short range charge ordering. In the local structure determined by PDF analysis, two types of MnO6 octahedra with long and short atomic distances between Mn and O atoms exist and their Mn-O distances are almost consistent with the distances in the charge ordered phase. From these results, valence electrons are localized at Mn sites like a glass even in the cubic phase, resulting in the non-metallic electrical conductivity.

原文English
文章編號094601
期刊Journal of the Physical Society of Japan
82
發行號9
DOIs
出版狀態Published - 2013 9月

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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