Homogeneous crystal nucleation in Ni droplets

0477543 - FZÚ 2018 RIV NL eng J - Journal Article
Kožíšek, Zdeněk - Demo, Pavel
Homogeneous crystal nucleation in Ni droplets.
Journal of Crystal Growth. Roč. 475, Oct (2017), s. 247-250. ISSN 0022-0248. E-ISSN 1873-5002
R&D Projects: GA MŠMT LD15004
Institutional support: RVO:68378271
Keywords : nucleation * crystallization * phase transition * nickel
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.742, year: 2017

Repeating measurements of supercooling or time delay, at which phase transition is detected, are statistically processed to determine the so-called survivorship function, from which nucleation rate is computed. The size distribution of nuclei is difficult to measure near the critical size directly, and it is not clear which amount of nuclei is formed at the moment when the phase transition is detected. In the present paper, kinetic nucleation equations are solved for the crystal nucleation in Ni liquid droplet to determine the number of nuclei formed within a considered system. Analysis of supercooling experimental data, based on the classical nucleation theory CNT), computes appropriate values of the nucleation rate. However, CNT underestimates the number of nuclei F (F≪1 for supercritical sizes). Taking into account the dependence of the surface energy on nucleus size to data analysis overcomes this discrepancy and leads to reasonable values of the size distribution of nuclei.
Permanent Link: http://hdl.handle.net/11104/0273866