Positronics of subnanometer atomistic imperfections in solids as a high-informative structure characterization tool

Oleh Shpotyuk; Jacek Filipecki; Adam Ingram; Roman Golovchak; Mykola Vakiv; Halyna Klym; Valentyna Balitska; Mykhaylo Shpotyuk; Andrzej Kozdras

doi:10.1186/s11671-015-0764-z

Positronics of subnanometer atomistic imperfections in solids as a high-informative structure characterization tool

Nanoscale Res Lett. 2015 Feb 19:10:77. doi: 10.1186/s11671-015-0764-z. eCollection 2015.

Authors

Oleh Shpotyuk¹, Jacek Filipecki², Adam Ingram³, Roman Golovchak⁴, Mykola Vakiv⁴, Halyna Klym⁵, Valentyna Balitska⁶, Mykhaylo Shpotyuk⁵, Andrzej Kozdras³

Affiliations

¹ Lviv Institute of Materials of SRC "Carat", Stryjska str., 202, Lviv, 79031 Ukraine ; Jan Dlugosz University, Al. Armii Krajowej, 13/15, Czestochowa, 42201 Poland.
² Jan Dlugosz University, Al. Armii Krajowej, 13/15, Czestochowa, 42201 Poland.
³ Opole University of Technology, Ozimska str., 75, Opole, 45370 Poland.
⁴ Lviv Institute of Materials of SRC "Carat", Stryjska str., 202, Lviv, 79031 Ukraine.
⁵ Lviv Institute of Materials of SRC "Carat", Stryjska str., 202, Lviv, 79031 Ukraine ; Lviv Polytechnic National University, Bandera str., 12, Lviv, 79013 Ukraine.
⁶ Lviv Institute of Materials of SRC "Carat", Stryjska str., 202, Lviv, 79031 Ukraine ; Lviv State University of Vital Activity Safety, Kleparivska str., 35, Lviv, 79007 Ukraine.

Abstract

Methodological possibilities of positron annihilation lifetime (PAL) spectroscopy applied to characterize different types of nanomaterials treated within three-term fitting procedure are critically reconsidered. In contrast to conventional three-term analysis based on admixed positron- and positronium-trapping modes, the process of nanostructurization is considered as substitutional positron-positronium trapping within the same host matrix. Developed formalism allows estimate interfacial void volumes responsible for positron trapping and characteristic bulk positron lifetimes in nanoparticle-affected inhomogeneous media. This algorithm was well justified at the example of thermally induced nanostructurization occurring in 80GeSe2-20Ga2Se3 glass.

Keywords: Nanomaterials; Positron annihilation lifetime; Positronics; Subatomic void; Trapping.