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. 2018 Sep 11;11(9):1685. doi: 10.3390/ma11091685

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© 2018 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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TEM images of sol-gel Bi₂O₃ powders (a) before and (d) after 500 °C heat treatment. (b,e) HRTEM images; and (c,f) selected area diffraction pattern (SAED) taken from the circled area in (a,d), respectively.