Heterogeneous diamond phases in compressed graphite studied by electron energy-loss spectroscopy

Yohei Sato, Matthieu Bugnet, Masami Terauchi, Gianluigi A. Botton, Akira Yoshiasa

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Chemical mapping imaged by electron energy-loss spectroscopy based on scanning transmission electron microscopy was conducted on a compressed graphite specimen containing different carbon allotropes (hexagonal diamond, cubic diamond, and graphite phases). This imaging process allows visualization of the complex spatial distribution of different diamond phases, and their coexistence was confirmed using dark field (DF) imaging. The chemical mapping images showed spatial distribution of local bonding state for hexagonal and cubic diamond phases in the whole specimen, while the DF images showed only a part of crystalline segments with long-range order. Thus, the chemical mapping method has an advantage for the purpose of observing locally the existence of individual carbon allotropes in the whole specimen. The size distribution of the hexagonal diamond phase is approximately 10-100 nm. These findings indicate that the compressing method can potentially synthesize ∼ 100 nm large diamond phases.

    Original languageEnglish
    Pages (from-to)190-196
    Number of pages7
    JournalDiamond and Related Materials
    Volume64
    DOIs
    Publication statusPublished - 2016 Apr 1

    Keywords

    • Chemical mapping
    • Compressed graphite
    • ELNES
    • Hexagonal diamond
    • Monochromator TEM
    • STEM-EELS

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Chemistry(all)
    • Mechanical Engineering
    • Materials Chemistry
    • Electrical and Electronic Engineering

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