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Title: Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites

Abstract

Control over structure and composition of (ABO(3)) perovskite oxides offers exciting opportunities since these materials possess unique, tunable properties. Perovskite oxides with cobalt B-site cations are particularly promising, as the range of the cations stable oxidation states leads to many possible structural frameworks. Here, we report growth of strontium cobalt oxide thin films by molecular beam epitaxy, and conditions necessary to stabilize different defect concentration phases. In situ X-ray scattering is used to monitor structural evolution during growth, while in situ X-ray absorption near-edge spectroscopy is used to probe oxidation state and measure changes to oxygen vacancy concentration as a function of film thickness. Experimental results are compared to kinetically limited thermodynamic predictions, in particular, solute trapping, with semiquantitative agreement. Agreement between observations of dependence of cobaltite phase on oxidation activity and deposition rate, and predictions indicates that a combined experimental/theoretical approach is key to understanding phase behavior in the strontium cobalt oxide system.

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [4];  [2]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States; Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
  2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
  3. Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
  4. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1425224
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: ACS Applied Materials and Interfaces; Journal Volume: 10; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
defects in oxides; metal oxides; molecular beam epitaxy; perovskite oxides; strontium cobalt oxide; thin films

Citation Formats

Andersen, Tassie K., Cook, Seyoung, Wan, Gang, Hong, Hawoong, Marks, Laurence D., and Fong, Dillon D. Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites. United States: N. p., 2018. Web. doi:10.1021/acsami.7b16970.
Andersen, Tassie K., Cook, Seyoung, Wan, Gang, Hong, Hawoong, Marks, Laurence D., & Fong, Dillon D. Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites. United States. doi:10.1021/acsami.7b16970.
Andersen, Tassie K., Cook, Seyoung, Wan, Gang, Hong, Hawoong, Marks, Laurence D., and Fong, Dillon D. Wed . "Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites". United States. doi:10.1021/acsami.7b16970.
@article{osti_1425224,
title = {Layer-by-Layer Epitaxial Growth of Defect-Engineered Strontium Cobaltites},
author = {Andersen, Tassie K. and Cook, Seyoung and Wan, Gang and Hong, Hawoong and Marks, Laurence D. and Fong, Dillon D.},
abstractNote = {Control over structure and composition of (ABO(3)) perovskite oxides offers exciting opportunities since these materials possess unique, tunable properties. Perovskite oxides with cobalt B-site cations are particularly promising, as the range of the cations stable oxidation states leads to many possible structural frameworks. Here, we report growth of strontium cobalt oxide thin films by molecular beam epitaxy, and conditions necessary to stabilize different defect concentration phases. In situ X-ray scattering is used to monitor structural evolution during growth, while in situ X-ray absorption near-edge spectroscopy is used to probe oxidation state and measure changes to oxygen vacancy concentration as a function of film thickness. Experimental results are compared to kinetically limited thermodynamic predictions, in particular, solute trapping, with semiquantitative agreement. Agreement between observations of dependence of cobaltite phase on oxidation activity and deposition rate, and predictions indicates that a combined experimental/theoretical approach is key to understanding phase behavior in the strontium cobalt oxide system.},
doi = {10.1021/acsami.7b16970},
journal = {ACS Applied Materials and Interfaces},
number = 6,
volume = 10,
place = {United States},
year = {Wed Jan 31 00:00:00 EST 2018},
month = {Wed Jan 31 00:00:00 EST 2018}
}