Effective potentials for quasicrystals from ab-initio data

Details Effective potentials for quasicrystals from ab-initio data Effective potentials for quasicrystals from ab-initio data

2007-04-02

arxiv.org/abs/0704.0163v1

Philosophical Magazine 86 (2006), 753

Physics

Condensed Matter

Materials Science

7 pages, 1 figure, Proceedings of International Conference on Quasicrystals 9

Scientific paper

10.1080/14786430500333349

Classical effective potentials are indispensable for any large-scale atomistic simulations, and the relevance of simulation results crucially depends on the quality of the potentials used. For complex alloys like quasicrystals, however, realistic effective potentials are practically inexistent. We report here on our efforts to develop effective potentials especially for quasicrystalline alloy systems. We use the so-called force matching method, in which the potential parameters are adapted so as to optimally reproduce the forces and energies in a set of suitably chosen reference configurations. These reference data are calculated with ab-initio methods. As a first application, EAM potentials for decagonal Al-Ni-Co, icosahedral Ca-Cd, and both icosahedral and decagonal Mg-Zn quasicrystals have been constructed. The influence of the potential range and degree of specialisation on the accuracy and other properties is discussed and compared.

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