Journal
SCRIPTA MATERIALIA
Volume 179, Issue -, Pages 55-60Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.01.007
Keywords
Flash sintering; Defects; Onset of the flash; Electro-chemical blackening; Gadolinium-doped ceria
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Funding
- German Research Foundation (DFG) [SPP 1959 (BR 3418/1-1)]
- Office of Naval Research [N00014-18-1-2270]
- Italian Ministry of University and Research (MIUR)
- MIUR [2017PMR932]
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In this paper, we discuss the progression of flash sintering in 10 mol% gadolinium-doped ceria specimens. Flash transition is correlated with the generation of n-type electronic conductivity in air under direct-current bias. Its origin is attributed to partial reduction of the material which propagates from the cathodic-to-anodic region. The phenomenon was observed, in-situ, by monitoring the development of electrochemical blackening during the incubation period of the flash-experiment. Anomalous features, including shift in the valence band edge, shrinkage of the band-gap and change in the oxidation state of Ce in flashed samples was confirmed by X-ray photoelectron spectroscopy and diffuse reflectance measurements. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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