Structural evolution of epitaxial SrCoO x films near topotactic phase transition

Jeen, Hyoungjeen; Lee, Ho Nyung

doi:10.1063/1.4938547

Title: Structural evolution of epitaxial SrCoO _x films near topotactic phase transition

Journal Article · Tue Dec 01 00:00:00 EST 2015 · AIP Advances

DOI:https://doi.org/10.1063/1.4938547· OSTI ID:1233971

; Lee, Ho Nyung

Control of oxygen stoichiometry in complex oxides via topotactic phase transition is an interesting avenue to not only modifying the physical properties, but utilizing in many energy technologies, such as energy storage and catalysts. However, detailed structural evolution in the close proximity of the topotactic phase transition in multivalent oxides has not been much studied. In this work, we used strontium cobaltites (SrCoO_x) epitaxially grown by pulsed laser epitaxy (PLE) as a model system to study the oxidation-driven evolution of the structure, electronic, and magnetic properties. We grew coherently strained SrCoO_2.5thin films and performed post-annealing at various temperatures for topotactic conversion into the perovskite phase (SrCoO_3-δ). We clearly observed significant changes in electronic transport, magnetism, and microstructure near the critical temperature for the topotactic transformation from the brownmillerite to the perovskite phase. Furthermore, the overall crystallinity was well maintained without much structural degradation, indicating that topotactic phase control can be a useful tool to control the physical properties repeatedly via redox reactions.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1233971

Alternate ID(s):: OSTI ID: 1234348; OSTI ID: 1420687

Journal Information:: AIP Advances, Journal Name: AIP Advances Vol. 5 Journal Issue: 12; ISSN 2158-3226

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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