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The cubic-to-hexagonal phase transition of cerium oxide particles: dynamics and structure

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Abstract

Cerium oxide is often applied in today's catalysts due to its remarkable oxygen storage capacity. The changes in stoichiometry during reaction are linked to structural modifications, which in turn affect its catalytic activity. We present a real-time in situ study of the structural transformations of cerium oxide particles on ruthenium(0001) at high temperatures of 700 °C in ultra-high vacuum. Our results demonstrate that the reduction from CeO2 to cubic Ce2O3 proceeds via ordered intermediary phases. The final reduction step from cubic to hexagonal Ce2O3 is accompanied by a lattice expansion, the formation of two new surface terminations, a partial dissolution of the cerium oxide particles, and a massive mass transport of cerium from the particles to the substrate. The conclusions allow for new insights into the structure, stability, and dynamics of cerium oxide nanoparticles in strongly reducing environments.

Graphical abstract: The cubic-to-hexagonal phase transition of cerium oxide particles: dynamics and structure

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Publication details

The article was received on 19 Dec 2016, accepted on 06 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C6NR09760J
Citation: Nanoscale, 2017, Advance Article
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    The cubic-to-hexagonal phase transition of cerium oxide particles: dynamics and structure

    J. Höcker, J. Krisponeit, T. Schmidt, J. Falta and J. I. Flege, Nanoscale, 2017, Advance Article , DOI: 10.1039/C6NR09760J

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