Nonlinear electrical properties of grain boundaries in oxygen ion conductors: case of acceptor doped ceria

Guo, X.; Waser, R.; Mi, S.

doi:10.1149/1.1830393

Journal Article

PreJuSER-44540

Nonlinear electrical properties of grain boundaries in oxygen ion conductors: case of acceptor doped ceria

Guo, X.FZJ* ; Mi, S.FZJ* ; Waser, R.FZJ*

2005
Soc. Pennington, NJ

Electrochemical and solid-state letters 8, J1 - J3 (2005) [10.1149/1.1830393]

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Please use a persistent id in citations: http://hdl.handle.net/2128/2676 doi:10.1149/1.1830393

Abstract: Owing to the positively charged grain boundary cores in acceptor-doped ZrO2 and CeO2, oxygen vacancies are depleted in the space charge layers. The validity of this space charge concept was checked for Y2O3-doped CeO2 ceramic of high purity. Electrical fields up to 2 x 10(5) V cm(-1) were applied to the grain boundaries of 1.0 mol % Y2O3-doped CeO2 at 400 degrees C in air, and the grain boundary properties were separated by means of impedance spectroscopy. It was discovered that the current-voltage relation for individual grain boundary was nonlinear, and that the effective grain boundary thickness increased with increasing bias, which supports the space charge concept. (C) 2004 The Electrochemical Society.

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