Alternative first-principles calculation of entropy for liquids
Abstract
Here, w present an alternative method for interpreting the velocity autocorrelation function (VACF) of a fluid with application to extracting the entropy in a manner similar to the methods developed by Lin et al. [J. Chem. Phys. 119, 11792 (2003)] and improved upon by Desjarlais [Phys. Rev. E 88, 062145 (2013)]. The liquid VACF is decomposed into two components, one gas and one solid, and each contribution's entropic portion is calculated. But, we fit both the gas and solid portions of the VACF in the time domain. This approach is applied to a single-component liquid (a two-phase model of liquid Al at the melt line) and two different two-component systems: a superionic-to-superionic (bcc to fcc) phase transition in H 2 O at high temperatures and pressures and a metastable liquid state of MgO. Finally, for all three examples, comparisons to existing results in the literature demonstrate the validity of our alternative.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1414085
- Alternate Identifier(s):
- OSTI ID: 1247822
- Report Number(s):
- LA-UR-16-20095
Journal ID: ISSN 2470-0045; PLEEE8; TRN: US1800620
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review E
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 4; Journal ID: ISSN 2470-0045
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Entropy; Molecular Dynamics; First Principles Calculation
Citation Formats
Meyer, Edmund R., Ticknor, Christopher, Kress, Joel D., and Collins, Lee A. Alternative first-principles calculation of entropy for liquids. United States: N. p., 2016.
Web. doi:10.1103/PhysRevE.93.042119.
Meyer, Edmund R., Ticknor, Christopher, Kress, Joel D., & Collins, Lee A. Alternative first-principles calculation of entropy for liquids. United States. https://doi.org/10.1103/PhysRevE.93.042119
Meyer, Edmund R., Ticknor, Christopher, Kress, Joel D., and Collins, Lee A. 2016.
"Alternative first-principles calculation of entropy for liquids". United States. https://doi.org/10.1103/PhysRevE.93.042119. https://www.osti.gov/servlets/purl/1414085.
@article{osti_1414085,
title = {Alternative first-principles calculation of entropy for liquids},
author = {Meyer, Edmund R. and Ticknor, Christopher and Kress, Joel D. and Collins, Lee A.},
abstractNote = {Here, w present an alternative method for interpreting the velocity autocorrelation function (VACF) of a fluid with application to extracting the entropy in a manner similar to the methods developed by Lin et al. [J. Chem. Phys. 119, 11792 (2003)] and improved upon by Desjarlais [Phys. Rev. E 88, 062145 (2013)]. The liquid VACF is decomposed into two components, one gas and one solid, and each contribution's entropic portion is calculated. But, we fit both the gas and solid portions of the VACF in the time domain. This approach is applied to a single-component liquid (a two-phase model of liquid Al at the melt line) and two different two-component systems: a superionic-to-superionic (bcc to fcc) phase transition in H 2 O at high temperatures and pressures and a metastable liquid state of MgO. Finally, for all three examples, comparisons to existing results in the literature demonstrate the validity of our alternative.},
doi = {10.1103/PhysRevE.93.042119},
url = {https://www.osti.gov/biblio/1414085},
journal = {Physical Review E},
issn = {2470-0045},
number = 4,
volume = 93,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2016},
month = {Fri Apr 15 00:00:00 EDT 2016}
}
Web of Science
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