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. 2020 May 30;20(11):3096. doi: 10.3390/s20113096

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a,b) TEM images and (c) HRTEM image of 2.5 mol% Sm₂O₃-doped SnO₂. (d–f) The Result of corresponding elemental mapping analysis [121]. Reprint permission was obtained from Elsevier.