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Title: Diffusion quantum Monte Carlo calculations of SrFeO3 and LaFeO3

Abstract

The equations of state, formation energy, and migration energy barrier of the oxygen vacancy in SrFeO3 and LaFeO3 were calculated in this paper with the diffusion quantum Monte Carlo (DMC) method. Calculations were also performed with various Density Functional Theory (DFT) approximations for comparison. DMC reproduces the measured cohesive energies of these materials with errors below 0.23(5) eV and the structural properties within 1% of the experimental values. The DMC formation energies of the oxygen vacancy in SrFeO3 and LaFeO3 under oxygen-rich conditions are 1.3(1) and 6.24(7) eV, respectively. Similar calculations with semi-local DFT approximations for LaFeO3 yielded vacancy formation energies 1.5 eV lower. Comparison of charge density evaluated with DMC and DFT approximations shows that DFT tends to overdelocalize the electrons in defected SrFeO3 and LaFeO3. Finally, calculations with DMC and local density approximation yield similar vacancy migration energy barriers, indicating that steric/electrostatic effects mainly determine migration barriers in these materials.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Univ. of Puerto Rico, Cayey, PR (United States). Dept. of Chemistry
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences. Computer Science and Mathematics Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Org.:
Univ. of Puerto Rico, Cayey, PR (United States)
OSTI Identifier:
1376467
Alternate Identifier(s):
OSTI ID: 1371601
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 147; Journal Issue: 3; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemical compounds; Monte Carlo methods; Density functional theory; Crystal defects; Intermolecular forces

Citation Formats

Santana, Juan A., Krogel, Jaron T., Kent, Paul R. C., and Reboredo, Fernando A. Diffusion quantum Monte Carlo calculations of SrFeO3 and LaFeO3. United States: N. p., 2017. Web. doi:10.1063/1.4994083.
Santana, Juan A., Krogel, Jaron T., Kent, Paul R. C., & Reboredo, Fernando A. Diffusion quantum Monte Carlo calculations of SrFeO3 and LaFeO3. United States. doi:10.1063/1.4994083.
Santana, Juan A., Krogel, Jaron T., Kent, Paul R. C., and Reboredo, Fernando A. Tue . "Diffusion quantum Monte Carlo calculations of SrFeO3 and LaFeO3". United States. doi:10.1063/1.4994083. https://www.osti.gov/servlets/purl/1376467.
@article{osti_1376467,
title = {Diffusion quantum Monte Carlo calculations of SrFeO3 and LaFeO3},
author = {Santana, Juan A. and Krogel, Jaron T. and Kent, Paul R. C. and Reboredo, Fernando A.},
abstractNote = {The equations of state, formation energy, and migration energy barrier of the oxygen vacancy in SrFeO3 and LaFeO3 were calculated in this paper with the diffusion quantum Monte Carlo (DMC) method. Calculations were also performed with various Density Functional Theory (DFT) approximations for comparison. DMC reproduces the measured cohesive energies of these materials with errors below 0.23(5) eV and the structural properties within 1% of the experimental values. The DMC formation energies of the oxygen vacancy in SrFeO3 and LaFeO3 under oxygen-rich conditions are 1.3(1) and 6.24(7) eV, respectively. Similar calculations with semi-local DFT approximations for LaFeO3 yielded vacancy formation energies 1.5 eV lower. Comparison of charge density evaluated with DMC and DFT approximations shows that DFT tends to overdelocalize the electrons in defected SrFeO3 and LaFeO3. Finally, calculations with DMC and local density approximation yield similar vacancy migration energy barriers, indicating that steric/electrostatic effects mainly determine migration barriers in these materials.},
doi = {10.1063/1.4994083},
journal = {Journal of Chemical Physics},
number = 3,
volume = 147,
place = {United States},
year = {2017},
month = {7}
}

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