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http://dx.doi.org/10.4191/kcers.2012.49.1.029

Oxygen Potential Gradient Induced Degradation of Oxides  

Martin, Manfred (Institute of Physical Chemistry, RWTH Aachen University)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.1, 2012 , pp. 29-36 More about this Journal
Abstract
In many applications of functional oxides originally homogeneous materials are exposed to gradients in the chemical potential of oxygen. Prominent examples are solid oxide fuel cells (SOFCs) or oxygen permeation membranes (OPMs). Other thermodynamic potential gradients are gradients of electrical potential, temperature or uni-axial pressure. The applied gradients act as generalized thermodynamic forces and induce directed fluxes of the mobile components. These fluxes may lead to three basic degradation phenomena of the materials, which are kinetic demixing, kinetic decomposition, and morphological instabilities.
Keywords
Oxygen potential gradient; Degradation; Kinetic demixing; Kinetic decomposition; Morphological instability;
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