Title :
O-Ps-related modes for study of free-volume entities in nanostructured MgAl2O4 ceramics
Author :
Ingram, A. ; Klym, H. ; Shpotyuk, O. ; Hadzaman, I.
Author_Institution :
Opole Univ. of Technol., Opole, Poland
Abstract :
The o-Ps-related modes are used for study of free-volume entities in nanostructured spinel MgAl2O4 ceramics after drying and water-immersion treatment. It is established that that water-sorption processes in magnesium aluminate ceramics leads to corresponding increase in positron trapping rates of extended defects located as addition phases near grain boundaries. These phase extractions and free-volume entities in ceramic structure serve as specific trapping centers for positrons penetrating ceramics. It is demonstrated that Tao-Eldrup model can be adequately used for the calculation free volume (or nanopores size) in MgAl2O4 ceramics using o-Ps lifetimes of the third and the fourth components.
Keywords :
ceramics; drying; extended defects; grain boundaries; magnesium compounds; nanostructured materials; sorption; MgAl2O4; O-Ps-related modes; Tao-Eldrup model; ceramic structure; drying treatment; extended defects; free-volume entities; grain boundaries; magnesium aluminate ceramics; nanopore size; nanostructured spinel ceramics; phase extractions; positron penetrating ceramics; positron trapping rates; trapping centers; water-immersion treatment; water-sorption processes; Ceramics; Electron traps; History; Positrons; free-volume entities; nanostructured ceramics; positron trapping; spinel; water treatment;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on
Conference_Location :
Lviv
Print_ISBN :
978-1-4799-5960-0
DOI :
10.1109/OMEE.2014.6912355
