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Open AccessArticle

Pressure Induced Stability Enhancement of Cubic Nanostructured CeO2

1
Laboratorio Argentino de Haces de Neutrones, Centro Atómico Bariloche, CNEA, Av. E. Bustillo 9500, San Carlos de Bariloche, Río Negro R8402AGP, Argentina
2
European Synchrotron Radiation Facility, 71 Av. des Martyrs, Grenoble 38000, France
3
Departamento de Física de la Materia Condensada, Centro Atómico Constituyentes, CNEA, Av. Gral. Paz 1499, San Martín, Buenos Aires 1650, Argentina
4
Escuela de Ciencia y Tecnología, Universidad Nacional de General San Martín, Alem 3901, San Martín, Buenos Aires 1650, Argentina
5
Instituto de Nanociencia y Nanotecnología, CNEA-CONICET, Av. Gral. Paz 1499, San Martín, Buenos Aires 1650, Argentina
*
Authors to whom correspondence should be addressed.
In memory of Dr. Claudio Ferrero.
Nanomaterials 2020, 10(4), 650; https://doi.org/10.3390/nano10040650
Received: 27 February 2020 / Revised: 24 March 2020 / Accepted: 24 March 2020 / Published: 31 March 2020
Ceria (CeO2)-based materials are widely used in applications such as catalysis, fuel cells and oxygen sensors. Its cubic fluorite structure with a cell parameter similar to that of silicon makes it a candidate for implementation in electronic devices. This structure is stable in a wide temperature and pressure range, with a reported structural phase transition to an orthorhombic phase. In this work, we study the structure of CeO2 under hydrostatic pressures up to 110 GPa simultaneously for the nanometer- and micrometer-sized powders as well as for a single crystal, using He as the pressure-transmitting medium. The first-order transition is clearly present for the micrometer-sized and single-crystal samples, while, for the nanometer grain size powder, it is suppressed up to at least 110 GPa. We show that the stacking fault density increases by two orders of magnitude in the studied pressure range and could act as an internal constraint, avoiding the nucleation of the high-pressure phase. View Full-Text
Keywords: nanoparticles; ceria; high pressure; X-ray diffraction; stacking faults nanoparticles; ceria; high pressure; X-ray diffraction; stacking faults
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MDPI and ACS Style

Paulin, M.A.; Garbarino, G.; Leyva, A.G.; Mezouar, M.; Sacanell, J. Pressure Induced Stability Enhancement of Cubic Nanostructured CeO2 . Nanomaterials 2020, 10, 650.

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