Embodiments of a microstructure that allows arrest of contaminant infiltration includes an inter layer and at least one highly reactive ceramic layer. The inter layer is not reactive to an infiltrating reactive species. The HRC layer includes materials that react with a reactive contaminant species to slow or arrest infiltration of such contaminant species.
STATEMENT OF FEDERALLY SPONSORED RESEARCH
 This invention was made with Government support under DE-SC0007544 awarded by the Department of Energy. The Government has certain rights to this invention.