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- W2080498000 abstract "Oxide potentials which transfer well between different materials have to account explicitly for many-body contributions to the interaction potentials between the ions. These include dipole and quadrupole polarization effects and the compression and deformation of an oxide ion by its immediate coordination environment. Such complex potentials necessarily involve many parameters. We examine how the results of ab initio electronic structure calculations, based upon planewave DFT methods, on general configurations of ions derived from simulations at finite temperature, may be used to parameterize an aspherical ion method (AIM) potential (A. J. Rowley, P. Jemmer, M. Wilson and P. A. Madden, J Chem. Phys., 1998, 108, 10209). Dipoles and quadrupoles on the individual ions are obtained via a transformation of the Kohn Sham orbitals to localized orbitals on each ion, which enables a distorted charge density for each ion to be obtained. The dipoles and quadrupoles appearing in polarization parts of the AIM potential are fit to those obtained from the ab initio ionic charge densities obtained in this way. The remaining parts of the potential, describing short-range repulsive interactions between ions with compressed and deformed charge densities, are fit to the ab initio forces and the stress tensor. By using a sufficiently large and varied set of configurations on which to carry out this optimization, an excellent transferable potential is obtained." @default.
- W2080498000 created "2016-06-24" @default.
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- W2080498000 date "2003-01-01" @default.
- W2080498000 modified "2023-10-01" @default.
- W2080498000 title "Multipoles and interaction potentials in ionic materials from planewave-DFT calculations" @default.
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- W2080498000 doi "https://doi.org/10.1039/b300319c" @default.
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