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Microstructure and nanoscopic porosity in black Pd films
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SYSNO ASEP 0539094 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Microstructure and nanoscopic porosity in black Pd films Author(s) Melikhova, O. (CZ)
Čízek, J. (CZ)
Hruška, Petr (FZU-D) ORCID
Lukáč, František (UFP-V) ORCID
Novotný, Michal (FZU-D) RID, ORCID, SAI
More Chevalier, Joris (FZU-D) ORCID
Fitl, P. (CZ)
Liedke, M.O. (DE)
Butterling, M. (DE)
Wagner, A. (DE)Number of authors 10 Source Title Acta Physica Polonica A. - : Polska Akademia Nauk - ISSN 0587-4246
Roč. 137, č. 2 (2020), s. 222-226Number of pages 5 s. Language eng - English Country PL - Poland Keywords positron-annihilation ; lifetimes ; palladium ; thin film Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Coating and films Subject RIV - cooperation Institute of Plasma Physics - Plasma and Gas Discharge Physics R&D Projects GA18-09347S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support FZU-D - RVO:68378271 ; UFP-V - RVO:61389021 UT WOS 000529332100034 EID SCOPUS 85083893027 DOI 10.12693/APhysPolA.137.222 Annotation In the present work the microstructure of a black Pd film prepared by thermal evaporation and a glossy Pd film deposited by magnetron sputtering was compared. While the glossy Pd film exhibits typical polycrystalline structure with column-like grains, the black Pd film has fractal-like porous structure. Positron annihilation spectroscopy revealed that positronium is formed in nanoscopic cavities of the black Pd film. In conventional metals positronium does not form due to screening by conduction electrons. However, in porous metals containing nanoscopic porosity a thermalized positron may pick an electron on inner surface of a pore and escape into a cavity forming positronium. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address https://doi.org/10.12693/APhysPolA.137.222
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