Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 13, Issue 2, Pages 1261-1264Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2013.6131
Keywords
Bimetallic Nanoparticles; Phase Transition; Cohesive Energy
Categories
Funding
- Program for New Century Excellent Talents in University [NCET-08-0574]
- Hunan Provincial Natural Science Foundation of China [09JJ3106]
- Shenghua Scholar Program of Central South University
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
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The cohesive energy (CE) of CoPt nanoparticles (NPs) with different sizes and shapes have been calculated by embedded-atom-method (EAM) potential. It is shown that CE of NPs with order or disorder structures decreases with the decrease of particle size, while the shape effects become obvious only at small size. The CE difference per atom between order and disorder structures decreases with the decrease of particle size, indicating that the possibility of order-disorder transition in small size becomes larger compared with these in large size. Significantly, the CE difference varies in proportion to order-disorder transition temperature (T-c), which suggests that one can predict order-disorder transition of NPs by calculation the cohesive energy. The present calculated T-c of CoPt NPs is consistent with recent experiments, simulation and theoretical predictions, and the method can also be applied to study the order-disorder transition of FePt, FePd, and so on.
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