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In Situ Preparation of Pr1-xCaxMnO3 and La1-xSrxMnO3 Catalysts Surface for High-Resolution Environmental Transmission Electron Microscopy

Institute of Materials Physics, University of Goettingen, D-37077, Goettingen, Germany
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Catalysts 2019, 9(9), 751; https://doi.org/10.3390/catal9090751
Received: 19 July 2019 / Revised: 26 August 2019 / Accepted: 29 August 2019 / Published: 6 September 2019
(This article belongs to the Section Electrocatalysis)
The study of changes in the atomic structure of a catalyst under chemical reaction conditions is extremely important for understanding the mechanism of their operation. For in situ environmental transmission electron microscopy (ETEM) studies, this requires preparation of electron transparent ultrathin TEM lamella without surface damage. Here, thin films of Pr1-xCaxMnO3 (PCMO, x = 0.1, 0.33) and La1-xSrxMnO3 (LSMO, x = 0.4) perovskites are used to demonstrate a cross-section specimen preparation method, comprised of two steps. The first step is based on optimized focused ion beam cutting procedures using a photoresist protection layer, finally being removed by plasma-etching. The second step is applicable for materials susceptible to surface amorphization, where in situ recrystallization back to perovskite structure is achieved by using electron beam driven chemistry in gases. This requires reduction of residual water vapor in a TEM column. Depending on the gas environment, long crystalline facets having different atomic terminations and Mn-valence state, can be prepared. View Full-Text
Keywords: perovskites; environmental transmission electron microscopy; surface chemistry perovskites; environmental transmission electron microscopy; surface chemistry
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Roddatis, V.; Lole, G.; Jooss, C. In Situ Preparation of Pr1-xCaxMnO3 and La1-xSrxMnO3 Catalysts Surface for High-Resolution Environmental Transmission Electron Microscopy. Catalysts 2019, 9, 751.

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