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Thermal analysis of Al droplet crystallization and modeling of the nucleation process: how to interpret experimental data?

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, ORCID}
Number of authors	3
Source Title	American Conference on Crystal Growth and Epitaxy (ACCGE-22). - Virtual : ACCGE, 2021 S. 295-295
Number 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

Number of the records: 1