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Thermal analysis of Al droplet crystallization and modeling of the nucleation process: how to interpret experimental data?
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SYSNO ASEP 0545284 Document Type A - Abstract R&D Document Type O - Ostatní Title Thermal analysis of Al droplet crystallization and modeling of the nucleation process: how to interpret experimental data? Author(s) Kožíšek, Zdeněk (FZU-D) RID, ORCID, SAI
Král, Robert (FZU-D) RID, ORCID
Zemenová, Petra (FZU-D) RID, ORCIDNumber of authors 3 Source Title American Conference on Crystal Growth and Epitaxy (ACCGE-22). - Virtual : ACCGE, 2021
S. 295-295Number of pages 1 s. Publication form Online - E Action American Conference on Crystal Growth and Epitaxy (ACCGE-22) / 20th US Workshop on Organometallic Vapor Phase Epitaxy OMVPE /20./ Event date 02.08.2021 - 04.08.2021 VEvent location Virtual Conference Country US - United States Event type WRD Language eng - English Country US - United States Keywords DSC ; crystallization ; nucleation ; aluminum Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 Annotation The crystallization of Aluminum (Al) droplet was detected by the Differential Scanning Calorimetry (DSC) at the temperature Tc = 642 C (undercooling 18 K) using broad range of cooling rates 2-20 K/min. In the next step, the repeated DSC measurements at the isothermal conditions with undercooling of ca. 6 K discovered that the crystallization event occured after relatively long time delay 10-50 min. Experimental data confirmed the stochastic nature of crystal nucleation similarly to other systems. We analyzed the DSC data using the Johnson-Mehl-Avrami (JMA) model and also via numerical solution of the standard kinetic model of nucleation. In this case, the JMA model fails as the dimensionality of the growth is unrealistic. The crystallization probably occurs by a two-step mechanism, i.e. when the structure of small sub-critical clusters differs from the larger ones and thus the nucleation kinetics is slow.
Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022
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