Peculiarities of «liquid – solid» phase equilibria in Six-Ge1-x nanoparticles for various mutual arrangements of phases
A.V. Shishulin1,2, A.V. Shishulina3, A.V. Kuptsov3
1 Russian Presidential Academy of National Economy and Public Administration
2 Pleiades Publ. Ltd.
3 R.E. Alekseev Nizhny Novgorod State Technical University
DOI: 10.26456/pcascnn/2024.16.437
Short communication
Abstract: The application of 3D nanocrystalline materials obtained using the liquid-phase and solid-phase powder metallurgy technologies is one of the basic approaches to designing high-efficiency and low-cost thermoelectric energy converters. Nanostructured alloys of the Six–Ge1-x system represent one of the most efficient high-temperature thermoelectric materials. Features of the equilibrium phase composition of Six–Ge1-x nanoparticles with a core-shell structure and various fractions of Si have been simulated using the thermodynamic approach in the interval between the liquidus and solidus temperatures. It has been demonstrated that the temperature dependences of the equilibrium phase composition of co-existing liquid and solid phases in the heterogeneous region significantly depend on the mutual arrangement of these phases in the core-shell structure. The results are accompanied by analysis of the initial composition effect which consists in the fact that not only the volume fractions of co-existing phases but also their composition depend on the Si fraction of the parent particle. The «hysteresis effect» has been shown. A thermodynamic interpretation of the obtained results has also been given based on three mechanisms of reducing the free energy of the system.
Keywords: nanoparticles, solid solutions, chemical thermodynamics, liquidus, solidus, core-shell structure, germanium, silicon
- Alexander V. Shishulin – Ph. D., Senior Lecturer, Russian Presidential Academy of National Economy and Public Administration, Technical Editor Pleiades Publ. Ltd.
- Anna V. Shishulina – Ph. D., Associate Professor, R.E. Alekseev Nizhny Novgorod State Technical University
- Alexey V. Kuptsov – 1st year graduate student, R.E. Alekseev Nizhny Novgorod State Technical University
Reference:
Shishulin, A.V. Peculiarities of «liquid – solid» phase equilibria in Six-Ge1-x nanoparticles for various mutual arrangements of phases / A.V. Shishulin, A.V. Shishulina, A.V. Kuptsov // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. — 2024. — I. 16. — P. 437-447. DOI: 10.26456/pcascnn/2024.16.437. (In Russian).
Full article (in Russian): download PDF file
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