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Title: Phase stability of TiO 2 polymorphs from diffusion Quantum Monte Carlo

Journal Article · · New Journal of Physics

Titanium dioxide, TiO2, has multiple applications in catalysis, energy conversion and memristive devices because of its electronic structure. Most of these applications utilize the naturally existing phases: rutile, anatase and brookite. Despite the simple form of TiO2 and its wide uses, there is long-standing disagreement between theory and experiment on the energetic ordering of these phases that has never been resolved. We present the first analysis of phase stability at zero temperature using the highly accurate many-body fixed node diffusion Quantum Monte Carlo (QMC) method. We also include the effects of temperature by calculating the Helmholtz free energy including both internal energy and vibrational contributions from density functional perturbation theory based quasi harmonic phonon calculations. Our QMC calculations find that anatase is the most stable phase at zero temperature, consistent with many previous mean-field calculations. However, at elevated temperatures, rutile becomes the most stable phase. For all finite temperatures, brookite is always the least stable phase.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1333426
Alternate ID(s):
OSTI ID: 1333427; OSTI ID: 1334466; OSTI ID: 1364442
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Vol. 18 Journal Issue: 11; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (11)

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Ab initio phase diagrams of Hf–O, Zr–O and Y–O: a comparative study journal January 2019
An efficient hybrid orbital representation for quantum Monte Carlo calculations journal August 2018
Subtlety of TiO 2 phase stability: Reliability of the density functional theory predictions and persistence of the self-interaction error journal January 2019
A new scheme for fixed node diffusion quantum Monte Carlo with pseudopotentials: Improving reproducibility and reducing the trial-wave-function bias journal October 2019
Diffusion Monte Carlo study of O 2 adsorption on single layer graphene journal August 2019
Electronic properties of doped and defective NiO: A quantum Monte Carlo study journal December 2017
Structural, electronic, and magnetic properties of bulk and epitaxial LaCoO 3 through diffusion Monte Carlo journal December 2019
Ti interstitial flows giving rutile TiO 2 reoxidation process enhancement in (001) surface journal December 2019
Recent progress in characterization of the core–shell structure of black titania journal March 2019