Nanoscale Imaging Studies of Cobaltite Thin Films Using X-Ray Nanodiffraction

POSTER

Abstract

The perovskite (ABO3) and closely related brownmillerite (ABO2.5) phase of cobaltites possess a wide range of functional properties, which makes them promising candidates for solid oxide fuel cells, ionically-gated devices, and magneto-ionic devices. However, the role played by nanoscale morphology, i.e. phase separation and defects in these oxide thin films and heterostructures, remains unknown. This poster presents nanoscale imaging studies of emergent structural phases and their morphology in cobaltite heterostructures using x-ray nano-diffraction. Gd/La0.67Sr0.33CoO3 heterostructures were ionically and stoichiometrically controlled via the thickness of the Gd oxygen-gettering layers. Our measurements, using the hard x-ray nanoprobe at the Advanced Photon Source, show lateral and transverse nanoscale separation of the perovskite and brownmillerite phases. These nanoscale heterogeneities were characterized and strain mapped in real space with a spatial resolution of 25 nm. Our studies provide insights into the nanoscale morphology which can be utilized to tune the macroscopic functional properties of cobaltite heterostructures.

*Funding Contributed by the University of California Multicampus Research Programs and Initiatives (Grant No. MR-15-328528)

Presenters

  • Geoffery Ian Rippy

    • Materials Science and Engineering, Uinversity of California, Davis
    • University of California, Davis
    • Materials Science and Engineering, University of California Davis

Authors

  • Geoffery Ian Rippy

    • Materials Science and Engineering, Uinversity of California, Davis
    • University of California, Davis
    • Materials Science and Engineering, University of California Davis

  • Lacey L Trinh

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis

  • Alexander Michael Kane

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis
    • Materials Science and Engineering, University of California, Davis

  • Aleksey Ionin

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis

  • Michael Steven Lee

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis
    • Materials Science and Engineering, University of California, Davis

  • Rajesh V Chopdekar

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
    • LBNL Advanced Light Source

  • Dustin Gilbert

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, NIST Gaithersburg
    • Department of Materials Engineering, University of Tennesse, Knoxville

  • Alexander Grutter

    • National Institute of Standards and Technology
    • NIST
    • NIST Center for Neutron Research, NIST Gaithersburg
    • Neutron-Condensed Matter Science Group, NIST
    • NIST Center for Neutron Research

  • Peyton Murray

    • University of California, Davis
    • Physics, University of California Davis

  • Martin Holt

    • Argonne National Laboratory
    • Center for Nanoscale Materials, Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory

  • Zhonghou Cai

    • Argonne National Laboratory
    • Advanced Photon Source, Argonne National Laboratory

  • Kai Liu

    • University of California, Davis
    • Physics, University of California Davis

  • Yayoi Takamura

    • University of California, Davis
    • Materials Science and Engineering, University of California Davis
    • Materials Science and Engineering, University of California, Davis

  • Roopali Kukreja

    • Materials Science and Engineering, Uinversity of California, Davis
    • University of California, Davis
    • Materials Science and Engineering, University of California Davis