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15 results

  • Pseudo Atomic Column EELS & EDS Mapping of Silicon Reconstructed With K and L Electrons Using STEM-Moiré Method

  • Eiji Okunishi, Yukihito Kondo
  • Journal:
    / Volume 22 / Issue S3 / July 2016
    Published online by Cambridge University Press:
    25 July 2016, pp. 264-265
    Print publication:
    July 2016
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  • Atomic Column Elemental Mapping by STEM-Moire Method

  • Eiji Okunishi, Noriaki Endo, Yukihito Kondo
  • Journal:
    / Volume 20 / Issue S3 / August 2014
    Published online by Cambridge University Press:
    27 August 2014, pp. 586-587
    Print publication:
    August 2014
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  • Direct observation of an ordered arrangement of vacancies and large local thermal vibration in rhenium silicide by Cs-corrected STEM

  • Shunta Harada, Katsushi Tanaka, Kyosuke Kishida, Norihiko L Okamoto, Noriaki Endo, Eiji Okunishi, Haruyuki Inui
  • Journal:
    MRS Online Proceedings Library Archive / Volume 1295 / 2011
    Published online by Cambridge University Press:
    19 January 2011, mrsf10-1295-n07-11
    Print publication:
    2011

  • The crystal structure of thermoelectric rhenium silicide with an ordered arrangement of vacancies is investigated by utilizing spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM) combined with synchrotron X-ray diffraction and conventional transmission electron microscopy. By STEM Cs corrected imaging, we can clearly observe Si vacancies in rhenium silicide, which is impossible without Cs correction. In addition, significantly reduced contrast levels are noted in STEM images for particular Si sites near vacancies. From the STEM image simulation, the reduced contrast levels are concluded to be due to anomalously large local thermal vibration of these Si atoms. The crystal structure of rhenium silicide can be successfully refined by the synchrotron X-ray diffraction starting with the deduced structure model from the STEM images and the occurrence of large local thermal vibration can be qualitatively confirmed. Furthermore, we confirm the validity of the refined crystal structure of rhenium silicide by comparing experimental images with simulated image generating with the refined crystal structure parameters.