Please use this identifier to cite or link to this item: https://sci.ldubgd.edu.ua/jspui/handle/123456789/1239
Title: Positronics of subnanometer atomistic imperfections in solids as a high-informative structure characterization tool
Authors: Shpotyk, Oleh
Filipecki, Jacek
Ingram, Adam
Golovchak, Roman
Vakiv, Mykila
Klym, Halyna
Balitska, Valentyna
Shpotyuk, Mychaylo
Kozdras, Andzej
Keywords: Nanomaterials
Subatomic void
Positron annihilation lifetime
Positronics
Trapping
Issue Date: 2015
Series/Report no.: Nanoscale Research Letter;11671-015-0764-z
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.
Description: Positronics of atomistic imperfections such as free-volume interfacial voids in nanostructurized solids with positron- trapping modes changed by incorporated nanoparticles is developed as unified mathematical algorithm of substitu- tional positron-positronium trapping in the same host matrix. Within developed formalism, grounded on coup- ling x3-x2-decomposition procedure, the physical charac- teristics of nanostructurized media can be well calculated to estimate (1) the defect-related positron lifetime linked to interfacial void volumes responsible for positron trap- ping and (2) the defect-free bulk positron lifetime of the agglomerated nanoparticles.
URI: http://hdl.handle.net/123456789/1239
Appears in Collections:2015

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