skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Brownmillerite Phase Formation and Evolution in Epitaxial Strontium Ferrite Heterostructures

Abstract

By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of Brownmillerite-structured SrFeO2.5+? (0=??0.5) thin films can be oriented differently on the same LaAlO3(001) substrate due to either a bottom up or top down synthesis route. The brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in the oxygen content and OVC configuration in the resultant films. Moreover, we also show that in situ transmission electron microscopy (TEM) can induce oxygen loss and drive a phase transition from perovskite SrFeO3 to brownmillerite SrFeO2.5+? with mixed horizontally and vertically aligned OVCs. The dimensionality change during the TEM sample preparation makes the bottom up and top down model not applicable. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1567047
Report Number(s):
PNNL-SA-141379
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 23
Country of Publication:
United States
Language:
English
Subject:
SrFeO3-d, compressive strain, oxygen vacancy channel, brownmillerite phase, in situ TEM

Citation Formats

Wang, Le, Yang, Zhenzhong, Bowden, Mark E., and Du, Yingge. Brownmillerite Phase Formation and Evolution in Epitaxial Strontium Ferrite Heterostructures. United States: N. p., 2019. Web. doi:10.1063/1.5096769.
Wang, Le, Yang, Zhenzhong, Bowden, Mark E., & Du, Yingge. Brownmillerite Phase Formation and Evolution in Epitaxial Strontium Ferrite Heterostructures. United States. doi:10.1063/1.5096769.
Wang, Le, Yang, Zhenzhong, Bowden, Mark E., and Du, Yingge. Mon . "Brownmillerite Phase Formation and Evolution in Epitaxial Strontium Ferrite Heterostructures". United States. doi:10.1063/1.5096769.
@article{osti_1567047,
title = {Brownmillerite Phase Formation and Evolution in Epitaxial Strontium Ferrite Heterostructures},
author = {Wang, Le and Yang, Zhenzhong and Bowden, Mark E. and Du, Yingge},
abstractNote = {By controlling the synthesis and process conditions, we show that the oxygen vacancy channels (OVCs) of Brownmillerite-structured SrFeO2.5+? (0=??0.5) thin films can be oriented differently on the same LaAlO3(001) substrate due to either a bottom up or top down synthesis route. The brownmillerite structure formation and evolution processes yield distinctively different optical and electronic properties, owing to the difference in the oxygen content and OVC configuration in the resultant films. Moreover, we also show that in situ transmission electron microscopy (TEM) can induce oxygen loss and drive a phase transition from perovskite SrFeO3 to brownmillerite SrFeO2.5+? with mixed horizontally and vertically aligned OVCs. The dimensionality change during the TEM sample preparation makes the bottom up and top down model not applicable. Our results offer further insight into the phase stability and oxygen-diffusion mechanisms, which is important for the predictive synthesis of novel functional materials.},
doi = {10.1063/1.5096769},
journal = {Applied Physics Letters},
number = 23,
volume = 114,
place = {United States},
year = {2019},
month = {6}
}

Works referenced in this record:

Anisotropic oxygen diffusion at low temperature in perovskite-structure iron oxides
journal, February 2010

  • Inoue, Satoru; Kawai, Masanori; Ichikawa, Noriya
  • Nature Chemistry, Vol. 2, Issue 3, p. 213-217
  • DOI: 10.1038/nchem.547

Topotactic Electrochemical Redox Reactions of the Defect Perovskite SrCoO2.5+x
September 1996

  • Nemudry, A.; Rudolf, P.; Schollhorn, R.
  • Chemistry of Materials, Vol. 8, Issue 9, p. 2232-2238
  • DOI: 10.1021/cm950504+