Transition to electronic conduction at the onset of flash in cubic zirconia

SCRIPTA MATERIALIA

卷:174

Article

Jo, Seohyeon¹  Raj, Rishi¹ 

[1] Univ Colorado, Dept Mech Engn, Mat Sci Program, Boulder, CO 80302 USA

关键词: Flash;    Single crystal zirconia;    Incubation time;    Mixed ionic and electronic conductivity;   

DOI  :  10.1016/j.scriptamat.2019.07.043

来源: Elsevier

【 摘 要 】

We report in-situ measurements of impedance spectroscopy during flash experiments with single crystals of cubic-yttria stabilized zirconia, conducted in ambient air at 300 degrees C to 700 degrees C under a direct current electric field. Platinum electrodes transition from blocking to non-blocking behavior before the onset of flash, indicating a transition to partial electronic conductivity during the incubation period. Even though the conductivity continued to increase with temperature the electron transport remained at a plateau of approximately 0.25. This result has ramifications not only in the fundamental understanding but also in technological significance of the flash phenomenon. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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