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Towards Reliable Modeling of Challenging f Electrons Bearing Materials: Experience from Modeling of Nuclear Materials.

Published online by Cambridge University Press:  16 January 2017

Piotr M. Kowalski ,
George Beridze ,
Yaqi Ji  and
Yan Li
Piotr M. Kowalski*
Affiliation:
Institute of Nuclear Waste Management and Reactor Safety (IEK-6), Forschungszentrum Jülich, Jülich, Germany JARA High-Performance Computing, Schinkelstraße 2, 52062, Aachen, Germany
George Beridze
Affiliation:
Institute of Nuclear Waste Management and Reactor Safety (IEK-6), Forschungszentrum Jülich, Jülich, Germany JARA High-Performance Computing, Schinkelstraße 2, 52062, Aachen, Germany
Yaqi Ji
Affiliation:
Institute of Nuclear Waste Management and Reactor Safety (IEK-6), Forschungszentrum Jülich, Jülich, Germany JARA High-Performance Computing, Schinkelstraße 2, 52062, Aachen, Germany
Yan Li
Affiliation:
Institute of Nuclear Waste Management and Reactor Safety (IEK-6), Forschungszentrum Jülich, Jülich, Germany JARA High-Performance Computing, Schinkelstraße 2, 52062, Aachen, Germany
*
*Corresponding author: e-mail: p.kowalski@fz-juelich.de
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Abstract

Because of steady increase in the availability of computing power, ab initio methods of computational materials science become everyday investigation tools in various research fields. This popularity of the first-principle-based atomistic modeling is in large part due to the performance of density functional theory (DFT), which could be used for simulations of chemically and structurally complex materials, including minerals, fluids and melts. However, because of intrinsic approximations, DFT is not always able to deliver reliable predictions. This is especially pronounced for f-elements bearing materials such as nuclear materials considered in nuclear waste management. Properties such as reaction enthalpies or electronic state are often badly predicted. In this contribution we discuss our experience with different computational methods, including the parameter free DFT+U method, in which the Hubbard U parameter is derived ab initio, for prediction of various properties of f electrons bearing materials. We show significant improvement obtained for structural and thermochemical parameters of various lanthanide-bearing ceramic materials and actinide-bearing molecular and solid compounds when the f electrons correlations are explicitly accounted for. Last, but not least, we demonstrate that complementary experimental and atomistic modeling studies result in superior and more complete characterization of challenging materials considered in nuclear waste management.

Keywords

nuclear materialsactinidesimulation
Type
Articles
Information
MRS Advances , Volume 2 , Issue 9: Theory, Characterization and Modeling , 2017 , pp. 491 - 497
Copyright
Copyright © Materials Research Society 2017 

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