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

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.

preprint2010arXivOpen access
D. MarrocchelliM. SalanneP. A. MaddenC. SimonP. Turq
cond-mat.mtrl-scicond-mat.dis-nn
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D. MarrocchelliM. SalanneP. A. MaddenC. SimonP. Turq

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