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Title: Strain control of oxygen vacancies in epitaxial strontium cobaltite films

Journal Article · · Advanced Functional Materials

In this study, the ability to manipulate oxygen anion defects rather than metal cations in complex oxides can facilitate creating new functionalities critical for emerging energy and device technologies. However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of important defects, oxygen vacancies. Here, strontium cobaltite (SrCoOx) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 °C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ≈30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1246773
Journal Information:
Advanced Functional Materials, Vol. 26, Issue 10; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 172 works
Citation information provided by
Web of Science

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Glass-Like Through-Plane Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La 0.5 Sr 0.5 CoO 3− δ journal November 2017
Co 3 O 4 Nanoparticles with Ultrasmall Size and Abundant Oxygen Vacancies for Boosting Oxygen Involved Reactions journal July 2019
Independent Tuning of Optical Transparency Window and Electrical Properties of Epitaxial SrVO 3 Thin Films by Substrate Mismatch journal July 2019
Oxygen Diode Formed in Nickelate Heterostructures by Chemical Potential Mismatch journal March 2018
Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface journal October 2018
Dynamic Field Modulation of the Octahedral Framework in Metal Oxide Heterostructures journal October 2018
Interfacial Lattice‐Strain‐Driven Generation of Oxygen Vacancies in an Aerobic‐Annealed TiO 2 (B) Electrode journal November 2019
Revealing Strain Effects on the Chemical Composition of Perovskite Oxide Thin Films Surface, Bulk, and Interfaces journal December 2019
Tuning of the Optical Properties of the Transparent Conducting Oxide SrVO 3 by Electronic Correlations journal January 2019
Interfacial Defect Engineering for Improved Portable Zinc–Air Batteries with a Broad Working Temperature journal June 2019
Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface‐Mounted Metal–Organic Frameworks journal January 2020
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H2O2 decomposition catalyzed by strontium cobaltites and their application in Rhodamine B degradation in aqueous medium journal March 2019
Atomic Layer Deposition for Surface Engineering of Solid Oxide Fuel Cell Electrodes journal March 2019
Engineering surface atomic structure of single-crystal cobalt (II) oxide nanorods for superior electrocatalysis journal September 2016
Activating cobalt(II) oxide nanorods for efficient electrocatalysis by strain engineering journal November 2017
Strain control of oxygen kinetics in the Ruddlesden-Popper oxide La1.85Sr0.15CuO4 journal January 2018
Room-temperature mechanocaloric effects in lithium-based superionic materials journal August 2018
Revealing the role of lattice distortions in the hydrogen-induced metal-insulator transition of SmNiO3 journal February 2019
Lattice strain-enhanced exsolution of nanoparticles in thin films journal April 2019
Ferromagnetism with strong magnetocrystalline anisotropy in A-site ordered perovskite YBaCo 2 O 6 epitaxial thin films prepared via wet-chemical topotactic oxidation journal January 2018
Enhanced magnetism in lightly doped manganite heterostructures: strain or stoichiometry? journal January 2019
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Room-temperature ferromagnetism and oxygen pressure-dependent optical, ferromagnetic properties in SrSn 0.5 Co 0.5 O 3 thin films journal March 2018
Oxygen content modulation by nanoscale chemical and electrical patterning in epitaxial SrCoO 3− δ (0 < δ ≤ 0.5) thin films journal June 2016
Strain coupling of oxygen non-stoichiometry in perovskite thin films journal December 2017
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Co 3 O 4 Nanoparticles with Ultrasmall Size and Abundant Oxygen Vacancies for Boosting Oxygen Involved Reactions journal March 2020
Revealing the role of lattice distortions in the hydrogen-induced metal-insulator transition of SmNiO3 text January 2019

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