Dimensional control of defect dynamics in perovskite oxide superlattices
Abstract
Point defects play a critical role in the structural, physical, and interfacial properties of perovskite oxide superlattices. However, understanding of the fundamental properties of point defects in superlattices, especially their transport properties, is rather limited. Here, we report predictions of the stability and dynamics of oxygen vacancies in SrTiO3/PbTiO3 oxide superlattices using first-principles calculations in combination with the kinetic Monte Carlo method. By varying the stacking period, i.e., changing of n in nSTO/nPTO, we discover a crossover from three-dimensional diffusion to primarily two-dimensional planar diffusion. Such planar diffusion may lead to novel designs of ionic conductors. We show that the dominant vacancy position may vary in the superlattices, depending on the superlattice structure and stacking period, contradicting the common assumption that point defects reside at interfaces. Moreover, we predict a significant increase in room-temperature ionic conductivity for 3STO/3PTO relative to the bulk phases. As a result, considering the variety of cations that can be accommodated in perovskite superlattices and the potential mismatch of spin, charge, and orbitals at the interfaces, this paper identifies a pathway to control defect dynamics for technological applications.
- Authors:
-
- The Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1464019
- Alternate Identifier(s):
- OSTI ID: 1424810
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 3; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Bredeson, Isaac, Zhang, Lipeng, Kent, Paul R. C., Cooper, Valentino R., and Xu, Haixuan. Dimensional control of defect dynamics in perovskite oxide superlattices. United States: N. p., 2018.
Web. doi:10.1103/PhysRevMaterials.2.035401.
Bredeson, Isaac, Zhang, Lipeng, Kent, Paul R. C., Cooper, Valentino R., & Xu, Haixuan. Dimensional control of defect dynamics in perovskite oxide superlattices. United States. https://doi.org/10.1103/PhysRevMaterials.2.035401
Bredeson, Isaac, Zhang, Lipeng, Kent, Paul R. C., Cooper, Valentino R., and Xu, Haixuan. Thu .
"Dimensional control of defect dynamics in perovskite oxide superlattices". United States. https://doi.org/10.1103/PhysRevMaterials.2.035401. https://www.osti.gov/servlets/purl/1464019.
@article{osti_1464019,
title = {Dimensional control of defect dynamics in perovskite oxide superlattices},
author = {Bredeson, Isaac and Zhang, Lipeng and Kent, Paul R. C. and Cooper, Valentino R. and Xu, Haixuan},
abstractNote = {Point defects play a critical role in the structural, physical, and interfacial properties of perovskite oxide superlattices. However, understanding of the fundamental properties of point defects in superlattices, especially their transport properties, is rather limited. Here, we report predictions of the stability and dynamics of oxygen vacancies in SrTiO3/PbTiO3 oxide superlattices using first-principles calculations in combination with the kinetic Monte Carlo method. By varying the stacking period, i.e., changing of n in nSTO/nPTO, we discover a crossover from three-dimensional diffusion to primarily two-dimensional planar diffusion. Such planar diffusion may lead to novel designs of ionic conductors. We show that the dominant vacancy position may vary in the superlattices, depending on the superlattice structure and stacking period, contradicting the common assumption that point defects reside at interfaces. Moreover, we predict a significant increase in room-temperature ionic conductivity for 3STO/3PTO relative to the bulk phases. As a result, considering the variety of cations that can be accommodated in perovskite superlattices and the potential mismatch of spin, charge, and orbitals at the interfaces, this paper identifies a pathway to control defect dynamics for technological applications.},
doi = {10.1103/PhysRevMaterials.2.035401},
journal = {Physical Review Materials},
number = 3,
volume = 2,
place = {United States},
year = {Thu Mar 08 00:00:00 EST 2018},
month = {Thu Mar 08 00:00:00 EST 2018}
}
Web of Science
Figures / Tables:
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Works referencing / citing this record:
A quantum-mechanical investigation of oxygen vacancies and copper doping in the orthorhombic CaSnO 3 perovskite
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