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000044540 084__ $$2WoS$$aElectrochemistry
000044540 084__ $$2WoS$$aMaterials Science, Multidisciplinary
000044540 1001_ $$0P:(DE-Juel1)VDB518$$aGuo, X.$$b0$$uFZJ
000044540 245__ $$aNonlinear electrical properties of grain boundaries in oxygen ion conductors: case of acceptor doped ceria
000044540 260__ $$aPennington, NJ$$bSoc.$$c2005
000044540 300__ $$aJ1 - J3
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000044540 440_0 $$013562$$aElectrochemical and Solid State Letters$$v8$$x1099-0062$$y1
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000044540 520__ $$aOwing to the positively charged grain boundary cores in acceptor-doped ZrO2 and CeO2, oxygen vacancies are depleted in the space charge layers. The validity of this space charge concept was checked for Y2O3-doped CeO2 ceramic of high purity. Electrical fields up to 2 x 10(5) V cm(-1) were applied to the grain boundaries of 1.0 mol % Y2O3-doped CeO2 at 400 degrees C in air, and the grain boundary properties were separated by means of impedance spectroscopy. It was discovered that the current-voltage relation for individual grain boundary was nonlinear, and that the effective grain boundary thickness increased with increasing bias, which supports the space charge concept. (C) 2004 The Electrochemical Society.
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000044540 8567_ $$uhttp://hdl.handle.net/2128/2676$$uhttp://dx.doi.org/10.1149/1.1830393
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