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Issue 23, 2010
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Multinuclear NMR of CaSiO3 glass: simulation from first-principles

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Abstract

An integrated computational method which couples classical molecular dynamics simulations with density functional theory calculations is used to simulate the solid-state NMR spectra of amorphous CaSiO3. Two CaSiO3 glass models are obtained by shell-model molecular dynamics simulations, successively relaxed at the GGA-PBE level of theory. The calculation of the NMR parameters (chemical shielding and quadrupolar parameters), which are then used to simulate solid-state 1D and 2D-NMR spectra of silicon-29, oxygen-17 and calcium-43, is achieved by the gauge including projector augmented-wave (GIPAW) and the projector augmented-wave (PAW) methods. It is shown that the limitations due to the finite size of the MD models can be overcome using a Kernel Estimation Density (KDE) approach to simulate the spectra since it better accounts for the disorder effects on the NMR parameter distribution. KDE allows reconstructing a smoothed NMR parameter distribution from the MD/GIPAW data. Simulated NMR spectra calculated with the present approach are found to be in excellent agreement with the experimental data. This further validates the CaSiO3 structural model obtained by MD simulations allowing the inference of relationships between structural data and NMR response. The methods used to simulate 1D and 2D-NMR spectra from MD GIPAW data have been integrated in a package (called fpNMR) freely available on request.

Graphical abstract: Multinuclear NMR of CaSiO3 glass: simulation from first-principles

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Supplementary files

Article information


Submitted
20 Nov 2009
Accepted
25 Feb 2010
First published
12 Apr 2010

Phys. Chem. Chem. Phys., 2010,12, 6054-6066
Article type
Paper

Multinuclear NMR of CaSiO3 glass: simulation from first-principles

A. Pedone, T. Charpentier and M. C. Menziani, Phys. Chem. Chem. Phys., 2010, 12, 6054
DOI: 10.1039/B924489A

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