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Article Abstract
Under illumination by a 300 keV electron beam, oxygen vacancy ordering structures are induced within cerium oxide grains. Our high-resolution transmission electron microscopy (HRTEM) study, supported by image simulation, reveals the evolution of these structures as vacancy concentration increases. The observed fluorite-type superlattice structures are identified as CeO, CeO, CeO, displaying a gradient in oxygen vacancy concentration moving away from the grain surface. Correspondingly, the structural sequence transitions from CeO to CeO and then to CeO. Without the constraints of surrounding grains, fluorite-type CeO nanocrystals show a preference for transformation into an A-type trigonal structure. Notably, at temperatures up to 200°C, only the perfect fluorite structure is observed. Structural models were validated through both [110] and [001] projections. Our findings further confirm lattice expansion associated with local oxygen vacancy enrichment, which can be compensated by the formation of stacking faults, where a {111} oxygen plane is lost at defect sites.
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| http://dx.doi.org/10.1016/j.ultramic.2025.114133 | DOI Listing |
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