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Title: Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction

Abstract

Ruddlesden-Popper structured oxides, general form A n+1B nO 3n+1, consist of n-layers of the perovskite structure stacked in between rock-salt layers, and have potential application in solid oxide electrochemical cells and ion transport membrane reactors. Three materials with constant Co/Fe ratio, LaSrCo 0.5Fe 0.5O 4-δ (n = 1), La 0.3Sr 2.7CoFeO 7-δ (n = 2), and LaSr 3Co 1.5Fe 1.5O 10-δ (n = 3) were synthesized and studied via in situ neutron powder diffraction between 765 K and 1070 K at a pO 2 of 10 -1 atm. Then, the structures were fit to a tetragonal I4/mmm space group, and were found to have increased total oxygen vacancy concentration in the order La 0.3Sr 2.7CoFeO 7-δ > LaSr 3Co 1.5Fe 1.5O 10-δ > LaSrCo 0.5Fe 0.5O 4-δ, following the trend predicted for charge compensation upon increasing Sr 2+/La 3+ ratio. The oxygen vacancies within the material were almost exclusively located within the perovskite layers for all of the crystal structures with only minimal vacancy formation in the rock-salt layer. Finally, analysis of the concentration of these vacancies at each distinct crystallographic site and the anisotropic atomic displacement parameters for the oxygen sites reveals potential preferred oxygen transport pathways through themore » perovskite layers.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Lehigh Univ., Bethlehem, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1261475
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 3; Journal Issue: 43; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Tomkiewicz, Alex C., Tamimi, Mazin, Huq, Ashfia, and McIntosh, Steven. Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction. United States: N. p., 2015. Web. doi:10.1039/C5TA04193G.
Tomkiewicz, Alex C., Tamimi, Mazin, Huq, Ashfia, & McIntosh, Steven. Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction. United States. doi:10.1039/C5TA04193G.
Tomkiewicz, Alex C., Tamimi, Mazin, Huq, Ashfia, and McIntosh, Steven. Mon . "Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction". United States. doi:10.1039/C5TA04193G. https://www.osti.gov/servlets/purl/1261475.
@article{osti_1261475,
title = {Oxygen transport pathways in Ruddlesden–Popper structured oxides revealed via in situ neutron diffraction},
author = {Tomkiewicz, Alex C. and Tamimi, Mazin and Huq, Ashfia and McIntosh, Steven},
abstractNote = {Ruddlesden-Popper structured oxides, general form An+1BnO3n+1, consist of n-layers of the perovskite structure stacked in between rock-salt layers, and have potential application in solid oxide electrochemical cells and ion transport membrane reactors. Three materials with constant Co/Fe ratio, LaSrCo0.5Fe0.5O4-δ (n = 1), La0.3Sr2.7CoFeO7-δ (n = 2), and LaSr3Co1.5Fe1.5O10-δ (n = 3) were synthesized and studied via in situ neutron powder diffraction between 765 K and 1070 K at a pO2 of 10-1 atm. Then, the structures were fit to a tetragonal I4/mmm space group, and were found to have increased total oxygen vacancy concentration in the order La0.3Sr2.7CoFeO7-δ > LaSr3Co1.5Fe1.5O10-δ > LaSrCo0.5Fe0.5O4-δ, following the trend predicted for charge compensation upon increasing Sr2+/La3+ ratio. The oxygen vacancies within the material were almost exclusively located within the perovskite layers for all of the crystal structures with only minimal vacancy formation in the rock-salt layer. Finally, analysis of the concentration of these vacancies at each distinct crystallographic site and the anisotropic atomic displacement parameters for the oxygen sites reveals potential preferred oxygen transport pathways through the perovskite layers.},
doi = {10.1039/C5TA04193G},
journal = {Journal of Materials Chemistry. A},
number = 43,
volume = 3,
place = {United States},
year = {2015},
month = {9}
}

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Cited by: 9 works
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    MIEC-type ceramic membranes for the oxygen separation technology
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