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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 |
Files in This Item:
| File | Description | Size | Format | |
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| Стаття 1.pdf | 647.65 kB | Adobe PDF | View/Open |
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