Grain boundary space charge effect in zirconia - Experimental evidence

Guo, X.; Ding, Y.

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Grain boundary space charge effect in zirconia - Experimental evidence

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Guo, X.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Ding, Y.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Guo, X., & Ding, Y. (2004). Grain boundary space charge effect in zirconia - Experimental evidence. Journal of The Electrochemical Society, 151(1), J1-J7.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FE6A-E

Abstract

According 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.