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Characterization of LiBC by phase-contrast scanning transmission electron microscopy
Affiliation:1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Department of Electrophysics, National Chiayi University, Chiayi, 60004, Taiwan;2. Institute of Optoelectronics and Solid State Electronics, National Chiayi University, Chiayi, 60004, Taiwan;1. Institute of Metal Physics, Russian Academy of Sciences-Ural Division, 620990 Yekaterinburg, Russia;2. Sincrotrone Trieste S.C.p.A., Area Science Park S.S 14 km 163.5, 34012 Basovizza, Italy;3. Ural Federal University, 620089 Yekaterinburg, Russia;4. St. Petersburg State University, 199034 St. Petersburg, Russia;5. Synchrotron SOLEIL, 91190 Saint-Aubin, France;1. Speziallabor Triebenberg, Technische Universität Dresden, 01062 Dresden, Germany;2. IFW Dresden, PF 27 01 16, 01171 Dresden, Germany;3. CEOS GmbH, Englerstraße 28, 69126 Heidelberg, Germany;4. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom;1. Govt. College (Auto.), Angul, Odisha 759143, India;2. K.K. Junior College, Berhampur, Odisha 760001, India
Abstract:
LiBC was used as a model compound for probing the applicability of phase-contrast (PC) imaging in an aberration-corrected scanning transmission electron microscope (STEM) to visualize lithium distributions. In the LiBC structure, boron and carbon are arranged to hetero graphite layers between which lithium is incorporated. The crystal structure is reflected in the PC-STEM images recorded perpendicular to the layers. The experimental images and their defocus dependence match with multi-slice simulations calculated utilizing the reciprocity principle. The observation that a part of the Li positions is not occupied is likely an effect of the intense electron beam triggering Li displacement.
Keywords:Aberration-correction  STEM  Li detection  Hetero graphite
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