Journal
CHEMICAL PHYSICS LETTERS
Volume 719, Issue -, Pages 34-38Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2019.01.045
Keywords
NiPt2 bimetallic nanomaterial; Structure; Mechanical properties; Thermodynamic properties; First-principles calculations
Funding
- International Cooperation Project of Yunnan Province [2014IA037]
- Special Project of Scientific Research Institute of Yunnan Province [2009CF003]
- State Key Laboratory of Advanced Technology for Comprehensive Utilization of Platinum Metals [SKL-SPM-201816]
- National Natural Science Foundation of China [51564025]
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We apply the first-principles approach to study the structure, mechanical properties and Debye temperature of NiPt2 with two cubic structures (Pa-3 and Fd-3m). The results show that the Fd-3m structure is more thermodynamically stable than Pa-3 structure. The calculated lattice parameter of NiPt2 with Fd-3m structure is a = 5.820 angstrom. The calculated bulk modulus and Young's modulus of Fd-3m structure are 162.4 GPa and 134.8 GPa, which are larger than Pa-3 structure. The high elastic modulus is attributed to the formation of Pt tetrahedron structure. In addition, the calculated Debye temperature of Fd-3m structure is 239.9 K, which is larger than Pa-3 structure (107.6 K).
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