Effect Changing of Nanopore Volumes in MgAl2O3 Ceramics under the Influence of Water

The influence of adsorbed water on the change of free volume and nanopores in the MgAl
2
O
4
ceramics sintered at 1100 °C for 2
$h$
been studied using positron annihilation lifetime method. It is shown that after immersion of ceramics in water the positron and ortho-positronium trapping occurs more intensely. After drying of ceramic part of the water remains, as evidenced by the parameters of the third component of the annihilation spectrum. It has been established that adsorption processes in MgAl
2
O
4
ceramics lead to the fragmentation of nanopores, while desorption causes their agglomeration