A molecular dynamics study: structural and thermal evolution of 147 atom Co<sub>m</sub>Au<sub>n</sub> nanoalloys
Haydar Arslan, Ali Kemal Garip, Songul Taran
article (Uluslararası, Hakemli) | Yazar(lar): Haydar Arslan, Ali Kemal Garip, Songul Taran | Yıl: 2019 | Dergi/Kurum: JOURNAL OF NANOPARTICLE RESEARCH | İndeks: WOS.SCI | DOI: 10.1007/s11051-019-4568-4 | Anahtar Kelimeler: Au-Co nanoalloys, Structural stability, Melting dynamics, Modeling and simulation — Özet: In this
In this study, the classical molecular dynamics simulations in canonical ensemble conditions (NVT) were used to investigate the dynamical properties of bimetallic Co-Au nanoalloy clusters with the interatomic interactions modeled by Gupta many-body potential. Global optimizations were performed using basin-hopping algorithm for all compositions of 147 atom Co-Au bimetallic clusters. A structure based on icosahedron was obtained for the majority of the compositions. Structural analysis results showed that lower surface and cohesive energy of Au atoms give rise to Au atoms on the surface sites preferably. The global minimum structures were taken as the initial configurations for MD simulations. We obtained caloric curves and also Lindemann parameters to investigate melting transitions. In general, the melting temperatures were fluctuated around 675K for Au-rich compositions and 750K for Co-rich compositions.