Size effect in four-component Au-Cu-Pd-Pt nanoparticles and their stability

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Abstract

The four-component Au-Cu-Pd-Pt nanosystems of different sizes with the stoichiometric composition Au 3 CuPd 12 Pt 4 were studied. The molecular dynamics method was used as a simulation method, the interatomic interaction was described by the tight-binding potential. Based on the results of a series of computer experiments, it was found that the four-component Au-Cu-Pd-Pt nanoparticles do not have a tendency to form a core-shell structure, even though gold atoms demonstrate an increased segregation to the surface. Melting and crystallization temperatures were determined for the studied Au-Cu-Pd-Pt nanoparticles. The dependence of the crystallization temperature on the cooling rate was also established. With an increase in the cooling rate, the crystallization temperature decreases, and the temperature range in which crystallization occurs increases, while the heating rate does not significantly affect the melting temperature. It is shown that the size effect and the effect of the temperature-changing rate make it possible to control the dominant presence of the fcc or hcp local structure, and also affect the temperature stability of the resulting crystalline phases.

About the authors

Andrei Yu. Kolosov

Tver State University

Ph. D., Researcher, General Physics Department

Sergey A. Veresov

Tver State University

3rd year postgraduate student, General Physics Department

Sergei V. Serov

Tver State University

2nd year graduate student, General Physics Department

Denis N. Sokolov

Tver State University

Ph. D., Researcher, General Physics Department

Kseniya G. Savina

Tver State University

2nd year postgraduate student, General Physics Department

Roman E. Grigoriev

Tver State University

3rd year postgraduate student, General Physics Department

Nickolay Yu. Sdobnyakov

Tver State University

Email: nsdobnyakov@mail.ru
Dr. Sc., Docent, General Physics Department

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