Abstract
The variation of metal–metal bond strength or atomic site energy with number and type of atomic neighbors is described within a generalization of the bond order simulation (BOS) model, named the BOS-mixing model. The site energy for fixed coordination is expressed as a quadratic function of the number of existing mixed metal bonds. The three parameters in this functional form are (over)determined by the mixing energy as a function of composition for bulk bimetallic fcc systems. For the ten bimetallic alloys formed from Ni, Cu, Rh, Pd, and Ag, we find that the BOS-mixing model describes the composition dependence predicted by non-self-consistent electron density functional theory. Using the same BOS-mixing parameters obtained from this non-self-consistent electron density functional theory, the BOS-mixing model predicts accurately the microstructures (coordination arrangements) of clusters of Ni101Cu100, and Cu101Pd100 which are prototypical systems for bimetallic clusters. For Ni101Pd100 the BOS-mixing model displays some inaccuracies due to the atomic size mismatch of 10% which distorts the cluster shape from a perfect lattice structure. This is the same effect noted in previous applications of the BOS model and is thus expected.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 8:13 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 5, 2024, 4:02 p.m.) |
Indexed | 1 year, 3 months ago (May 14, 2024, 9:41 p.m.) |
Issued | 30 years, 4 months ago (April 1, 1995) |
Published | 30 years, 4 months ago (April 1, 1995) |
Published Print | 30 years, 4 months ago (April 1, 1995) |
@article{Zhu_1995, title={Bond order simulation model: Coordination dependent bimetallic bonds}, volume={102}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.469261}, DOI={10.1063/1.469261}, number={13}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Zhu, Ling and DePristo, Andrew E.}, year={1995}, month=apr, pages={5342–5349} }