Study of nanoporous in humidity-sensitive MgAl2O4 ceramics with positron annihilation lifetime spectroscopy

Abstract

Abstract. It has been shown that positron annihilation lifetime spectroscopy is a quite promising tool for nanostructural characterization of humidity-sensitive spinel-type MgAl 2 O 4 ceramics. The results have been achieved using the four-component fitting procedure with arbitrary lifetimes that is applied to mathematically treat the measured spectra. It has been shown that the Tao-Eldrup model is adequate to calculate the nanopore size in MgAl 2 O 4 ceramics if using the lifetime values of the third and fourth components.