The construction of a reliable potential for GeO2 from first-principles

Details The construction of a reliable potential for GeO2 from first-principles The construction of a reliable potential for GeO2 from first-principles

2010-01-12

arxiv.org/abs/1001.1843v1

Mol. Phys., 107 (4 - 6) 443-452 (2009)

Physics

Condensed Matter

Materials Science

9 pages, 8 figures

Scientific paper

10.1080/00268970902845347

The construction of a reliable potential for GeO2, from first-principles, is described. The obtained potential, which includes dipole polarization effects, is able to reproduce all the studied properties (structural, dynamical and vibrational) to a high degree of precision with a single set of parameters. In particular, the infrared spectrum was obtained with the expression proposed for the dielectric function of polarizable ionic solutions by Weis et al. [J.M. Caillol, D. Levesque and J.J. Weis, J. Chem. Phys. 91, 5544 (1989)]. The agreement with the experimental spectrum is very good, with three main bands that are associated to tetrahedral modes of the GeO2 network. Finally, we give a comparison with a simpler pair-additive potential.

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