TY - GEN
T1 - Direct observation of an ordered arrangement of vacancies and large local thermal vibration in rhenium silicide by Cs-corrected STEM
AU - Harada', Shunta
AU - Tanaka, Katsushi
AU - Kishida, Kyosuke
AU - Okamoto', Norihiko L.
AU - Endo, Noriaki
AU - Okunishi, Eiji
AU - Inui, Haruyuki
N1 - Funding Information:
This work was partly supported by Grant-in-Aid for Scientific Research (A) and (B) from the Ministry of Education, Science and Culture and Technology (MEXT), Japan (No.21246101 and No.21360337) and in part by the Global COE (Center of Excellence) Program on International Center for Integrated Research and Advanced Education in Material Science from the MEXT, Japan. One of the authors (S. H) greatly appreciates the supports from Grant-in-Aid for JSPS Fellows. The synchrotron radiation experiments were performed at the BL02B2 in the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2010A1548).
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
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U2 - 10.1557/opl.2011.43
DO - 10.1557/opl.2011.43
M3 - Conference contribution
AN - SCOPUS:80053219012
SN - 9781605112725
T3 - Materials Research Society Symposium Proceedings
SP - 397
EP - 402
BT - Intermetallic-Based Alloys for Structural and Functional Applications
T2 - 2010 MRS Fall Meeting
Y2 - 29 November 2010 through 3 December 2010
ER -