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

Abstract

It has been shown that positron annihilation lifetime spectroscopy is a quite promising tool for nanostructural characterization of humidity-sensitive spinel-type MgAl₂O₄ceramics. 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 MgAl₂O₄ ceramics if using the lifetime values of the third and fourth components.