Atomic-scale visualization of antisite defects in LiFePO4

Sung Yoon Chung, Si Young Choi, Takahisa Yamamoto, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    150 Citations (Scopus)

    Abstract

    We visualize the antisite exchange defects in LiFePO4 crystals with an ordered olivine structure by using annular dark-field scanning transmission electron microscopy (STEM). A recognizable bright contrast is observed in some of the Li columns of STEM images in a sample annealed at a lower temperature, which directly demonstrates the disordered occupations by Fe atoms. Furthermore, such exchange defects appear to be locally aggregated rather than homogeneously dispersed in the lattice, although their overall concentration is fairly low. The present study emphasizes the significance of atomic-level observations for the defect distribution that cannot be predicted by macroscopic analytical methods.

    Original languageEnglish
    Article number125502
    JournalPhysical Review Letters
    Volume100
    Issue number12
    DOIs
    Publication statusPublished - 2008 Mar 26

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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