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Title: Chemical expansion affected oxygen vacancy stability in different oxide structures from first principles calculations

Journal Article · · Computational Materials Science, 99:298-305

We study the chemical expansion for neutral and charged oxygen vacancies in fluorite, rocksalt, perovskite and pyrochlores materials using first principles calculations. We show that the neutral oxygen vacancy leads to lattice expansion whereas the charged vacancy leads to lattice contraction. In addition, we show that there is a window of strain within which an oxygen vacancy is stable; beyond that range, the vacancy can become unstable. Using CeO2|ZrO2 interface structure as an example, we show that the concentration of oxygen vacancies can be manipulated via strain, and the vacancies can be preferentially stabilized. These results could serve as guiding principles in predicting oxygen vacancy stability in strained systems and in the design of vacancy stabilized materials.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1222054
Journal Information:
Computational Materials Science, 99:298-305, Journal Name: Computational Materials Science, 99:298-305
Country of Publication:
United States
Language:
English

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Cited By (6)

Influence of Mixed Valence on the Formation of Oxygen Vacancy in Cerium Oxides journal December 2019
Interplay between strain, defect charge state, and functionality in complex oxides journal July 2016
Optical revelation of defects in epitaxial barium titanate films journal January 2019
Strain effects on oxygen vacancy energetics in KTaO 3 journal January 2017
Interplay between strain, defect charge state, and functionality in complex oxides text January 2016
Effects of Oxygen Modification on the Structural and Magnetic Properties of Highly Epitaxial La0.7Sr0.3MnO3 (LSMO) thin films journal February 2020

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