Water-sorption processes in nanostructured ceramics for sensor electronics studied with positron annihilation instruments

摘要

The water-sensitive processes in nanoporous MgAl2O4 ceramics are studied. It is shown that water-sorption processes in magnesium aluminate ceramics leads to corresponding increase in positron trapping rates of extended defects located near intergranual boundaries. This catalytic affect has reversible nature, being strongly dependent on sorption water fluxes in ceramics. The fixation of all water-dependent positron trapping inputs allow to refine the most significant changes in positron trapping rate of extended defects.