In this paper, we discuss the progression of flash sintering in 10mol% 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.
Electronic conductivity in gadolinium doped ceria under direct current as a trigger for flash sintering / Mishra, T. P.; Neto, R. R. I.; Speranza, G.; Quaranta, A.; Sglavo, V. M.; Raj, R.; Guillon, O.; Bram, M.; Biesuz, M.. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 179:(2020), pp. 55-60. [10.1016/j.scriptamat.2020.01.007]
Electronic conductivity in gadolinium doped ceria under direct current as a trigger for flash sintering
Quaranta A.;Sglavo V. M.;Biesuz M.
2020-01-01
Abstract
In this paper, we discuss the progression of flash sintering in 10mol% 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.File | Dimensione | Formato | |
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