Different atomic contrasts in HAADF images and EELS maps of rutile TiO2.

Autor:	Iwashimizu C; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan., Haruta M; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan., Nemoto T; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan., Kurata H; Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
Jazyk:	angličtina
Zdroj:	Microscopy (Oxford, England) [Microscopy (Oxf)] 2023 Aug 04; Vol. 72 (4), pp. 353-360.
DOI:	10.1093/jmicro/dfac067
Abstrakt:	High-angle annular dark-field (HAADF) imaging and elemental mapping at the atomic scale by scanning transmission electron microscopy (STEM) combined with electron energy-loss spectroscopy (EELS) are widely used for material characterization, in which quantitative understanding of the contrast of the image is required. Here, we report an unexpected image contrast in the elemental mapping of rutile TiO2, where the Ti L2,3 map shows an anisotropic elliptical shape that extends along the long axis in the octahedral structure, while the atomic contrast of Ti columns in the HAADF image is almost circular. Multi-slice simulation reveals that unique electron channeling related to the rutile structure and the difference of the potentials between HAADF and EELS cause the different atomic contrasts in the two images. (© The Author(s) 2022. Published by Oxford University Press on behalf of The Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
Databáze:	MEDLINE
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