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DFT Accurate Interatomic Potential for Molten NaCl from Machine Learning

Journal Article · · Journal of Physical Chemistry. C
Molten alkali chloride salts are a critical component in concentrated solar power and nuclear applications. Despite their ubiquity, the extreme chemical reactivity of molten alkali chlorides at high temperatures has presented a significant challenge in characterizing atomic structures and dynamic properties experimentally. In this work, we we investigate molten NaCl by performing high temperature molecular dynamics simulations using a Gaussian Approximation Potential (GAP) trained on Density Functional Theory (DFT) datasets. Our GAP model, trained with a meager 1000 atomic configurations, arrives at near ab initio accuracy with a mean absolute error of 1.5 meV/atom thus enabling fast analysis of high temperature salt properties on large length (5000 ion pairs) and time (> 1ns) scales currently inaccessible to ab initio simulations. Calculated structure factors and diffusion constants from our GAP model simulations show excellent agreement with experiments. Our results indicate that GAP models are able to capture the many-body interactions required to accurately model ionic-systems.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Deutsche Forschungsgemeinschaft (DFG); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1774556
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 47 Vol. 124; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (66)

cp2k: atomistic simulations of condensed matter systems
  • Hutter, Jürg; Iannuzzi, Marcella; Schiffmann, Florian
  • Wiley Interdisciplinary Reviews: Computational Molecular Science, Vol. 4, Issue 1 https://doi.org/10.1002/wcms.1159
journal June 2013
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Zur Gittertheorie der Ionenkristalle journal January 1932
The density of liquid NaCl and KCl and an estimate of their critical constants together with those of the other alkali halides journal December 1962
Ionic sizes and born repulsive parameters in the NaCl-type alkali halides—I journal January 1964
Ionic sizes and born repulsive parameters in the NaCl-type alkali halides—II journal January 1964
Redox electrochemistry and formal standard redox potentials of the Eu(III)/Eu(II) redox couple in an equimolar mixture of molten NaClKCl journal January 2001
Quickstep: Fast and accurate density functional calculations using a mixed Gaussian and plane waves approach journal April 2005
Electrolysis of solid metal sulfide to metal and sulfur in molten NaCl–KCl journal December 2011
Phase-Transferable Force Field for Alkali Halides journal October 2018
Performance and Cost Assessment of Machine Learning Interatomic Potentials journal October 2019
Modeling the Phase-Change Memory Material, Ge 2 Sb 2 Te 5 , with a Machine-Learned Interatomic Potential journal September 2018
Fluid Structure of Molten LiCl–Li Solutions journal October 2019
Realistic Atomistic Structure of Amorphous Silicon from Machine-Learning-Driven Molecular Dynamics journal May 2018
Elucidating Ionic Correlations Beyond Simple Charge Alternation in Molten MgCl 2 –KCl Mixtures journal November 2019
Liquid Metal Batteries: Past, Present, and Future journal November 2012
Diffusion of Unlike Ions into Liquid Sodium Chloride journal July 1964
Self-Diffusion and Structure in Molten Group II Chlorides 1 journal May 1965
Electrical Conductance and Density of Molten Salt Systems: KCl–LiCl, KCl–NaCl and KCl–KI journal February 1955
Development and Testing of the OPLS All-Atom Force Field on Conformational Energetics and Properties of Organic Liquids journal January 1996
Towards exact molecular dynamics simulations with machine-learned force fields journal September 2018
Machine-learned interatomic potentials by active learning: amorphous and liquid hafnium dioxide journal July 2020
Machine learning for molecular and materials science journal July 2018
Molten alkali halides – temperature dependence of structure, dynamics and thermodynamics journal January 2019
Temperature effects on the ionic conductivity in concentrated alkaline electrolyte solutions journal January 2020
Studies of the local structures of molten metal halides journal January 2011
Self-diffusion in molten alkali halides journal January 1961
X-ray diffraction analysis of molten NaCl near its melting point
  • Ohno, Hideo; Furukawa, Kazuo
  • Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, Vol. 77, Issue 8 https://doi.org/10.1039/f19817701981
journal January 1981
Étude des sels fondus par diffraction des rayons X aux températures élevées (Suite) II. Structure à l'état liquide des chlorures LiCl, NaCl, KCl, BaCl2 et du fluorure CaF2. Considérations générales sur la structure des halogénures fondus journal January 1958
Dispersion and Polarizability and the van der Waals Potential in the Alkali Halides journal April 1933
Interatomic Distances in Crystals of the Alkali Halides journal September 1933
Density-functional-based molecular-dynamics simulations of molten salts journal October 2005
First principles molecular dynamics of molten NaCl journal March 2007
Gaussian basis sets for accurate calculations on molecular systems in gas and condensed phases journal September 2007
Calculations of the thermal conductivities of ionic materials by simulation with polarizable interaction potentials journal March 2009
The origin of the conductivity maximum in molten salts. I. Bismuth chloride journal March 2012
A unified formulation of the constant temperature molecular dynamics methods journal July 1984
Molten Salts Data: Diffusion Coefficients in Single and Multi‐Component Salt Systems journal July 1982
Small-angle scattering and the structure of ambient liquid water journal July 2010
Interionic potentials in alkali halides and their use in simulations of the molten salts journal May 1976
Polarization effects in ionic solids and melts journal October 2011
Transport coefficients and the Stokes–Einstein relation in molten alkali halides with polarisable ion model journal May 2015
A theory of the electrical properties of liquid metals: III. the resistivity of binary alloys journal January 1965
Comments on the structure of molten salts journal April 1982
The structure of molten sodium chloride journal November 1975
The Molecular Dynamics Calculation of Transport Coefficients journal January 1991
Structure and dynamics of molten salts journal September 1986
Neutron and x-ray diffraction studies of liquids and glasses journal November 2005
The structure of molten LiCl journal December 1989
Analysis of high-energy x-ray diffraction data at high pressure: the case of vitreous As 2 O 3 at 32 GPa journal September 2007
Polarization effects in ionic systems from first principles journal April 1993
The solvation and ion condensation properties for sulfonated polyelectrolytes in different solvents—a computational study journal February 2014
Inhomogeneous Electron Gas journal November 1964
Self-Consistent Equations Including Exchange and Correlation Effects journal November 1965
Canonical dynamics: Equilibrium phase-space distributions journal March 1985
Separable dual-space Gaussian pseudopotentials journal July 1996
On representing chemical environments journal May 2013
Gaussian Approximation Potentials: The Accuracy of Quantum Mechanics, without the Electrons journal April 2010
Generalized Gradient Approximation Made Simple journal October 1996
Achieving DFT accuracy with a machine-learning interatomic potential: Thermomechanics and defects in bcc ferromagnetic iron journal January 2018
Machine Learning a General-Purpose Interatomic Potential for Silicon journal December 2018
A comparison of various commonly used correlation functions for describing total scattering journal April 2001
Review—Metallic Lithium and the Reduction of Actinide Oxides journal January 2017
Electrochemical Reduction of TiO 2 in Molten LiCl–Li 2 O journal August 2007
Concentrating Solar Power Gen3 Demonstration Roadmap report January 2017
Pyroprocessing Flowsheets for Recycling used Nuclear fuel journal August 2011