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000034062 084__ $$2WoS$$aElectrochemistry
000034062 084__ $$2WoS$$aMaterials Science, Coatings & Films
000034062 1001_ $$0P:(DE-Juel1)VDB518$$aGuo, X.$$b0$$uFZJ
000034062 245__ $$aGrain boundary space charge effect in Zirconia
000034062 260__ $$aPennington, NJ$$bElectrochemical Society$$c2004
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000034062 520__ $$aAccording to the space charge concept, oxygen vacancies are depleted in the grain boundary space charge layers of acceptor-doped ZrO2; whereas electrons are expected to accumulate in the space charge layers if present, leading to significant changes in the grain boundary electrical properties. In this work, electrons were introduced to 8 mol % TiO2 and 7.36 mol % Y2O3-codoped ZrO2 by annealing in the mixture of 2% H-2-Ar; as a result, the grain boundary arc disappeared, and the electrical conductivities increased considerably, especially for the sample with finer grain size. Both phenomena suggest highly conductive grain boundaries resulting from the accumulation of electrons in the space charge layers. (C) 2003 The Electrochemical Society.
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