Number of the records: 1
Evaluation of Aberration-corrected Optical Sectioning for Exploring the Core Structure of 1/2[111] Screw Dislocations in BCC Metals
- 1.
SYSNO ASEP 0483111 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Evaluation of Aberration-corrected Optical Sectioning for Exploring the Core Structure of 1/2[111] Screw Dislocations in BCC Metals Author(s) Hernandez-Maldonado, D. (GB)
Gröger, Roman (UFM-A) RID, ORCID
Ramasse, Q. M. (GB)
Hirsch, P. B. (GB)
Nellist, P. D. (GB)Number of authors 5 Source Title Microscopy and Microanalysis. - : Cambridge University Press - ISSN 1431-9276
Roč. 23, č. 1 (2017), s. 432-433Number of pages 2 s. Language eng - English Country US - United States Keywords optical sectioning ; screw dislocation ; electron microscopy Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects GA16-13797S GA ČR - Czech Science Foundation (CSF) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFM-A - RVO:68081723 DOI 10.1017/S1431927617002847 Annotation The introduction of spherical-aberration correctors in the Scanning Transmission Electron Microscope
(STEM) has allowed an improvement in spatial resolution to the sub-angström scale accompanied by a
reduction of the depth of focus (due to the increase in probe convergence angles), which in a modern
instrument is just a few nanometers, thus often less than the sample thickness. This can be exploited to
extract information along the beam direction by focusing the electron probe at specific depths within the
sample. In this communication we will evaluate the optical sectioning technique to explore the core structure of
1/2[111] screw dislocations in body-centred cubic (BCC) metals. The study of this structure is of high
interest because the low-temperature plastic deformation of BCC metals is controlled by the glide of
1/2[111] screw dislocations. The aim of this work is to investigate whether the edge and screw displacements
associated with 1/2[111] screw dislocations in BCC metals can be detected by optical sectioning in high-angle
annular dark field (HAADF) imaging in STEM conditions.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
Number of the records: 1