Open AccessК вопросу о плавлении наночастиц фрактальной формы (на примере системы Si-Ge)
Author(s) -
А.В. Шишулин,
В.Б. Федосеев,
А.В. Шишулина
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2019.09.48069.88-19
Subject(s) - liquidus , solidus , materials science , fractal dimension , phase (matter) , nanoparticle , fractal , thermodynamics , volume (thermodynamics) , alloy , nanotechnology , chemistry , metallurgy , physics , mathematical analysis , mathematics , organic chemistry
In this paper, thermodynamical approach has been used to simulate the influence of shape on phase equilibria in the two-phase-region between liquidus and solidus temperatures in case of Si-Ge alloy nanoparticles. Volumes and shapes of considered nanoparticles have been described by their effective radii and fractal dimensions, the dependence of fractal dimensions on temperature has been obtained using a simple geometrical model. It has been shown that decreasing the volume of a nanoparticle and its fractal dimension (which corresponds to nanoparticles of a more complicated shape) leads to narrowing down the temperature range of the heterogeneous region and changes the phase transition temperatures and equilibrium compositions of co-existing phases. At different temperatures, the dependences of the composition of the liquid phase differ which is explained by implementing different mechanisms of reducing the surface energy.