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

Tomkiewicz, Alex C.; Tamimi, Mazin; Huq, Ashfia; McIntosh, Steven

doi:10.1039/C5TA04193G

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

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Journal of Materials Chemistry. A

DOI:https://doi.org/10.1039/C5TA04193G· OSTI ID:1261475

Tomkiewicz, Alex C. ^[1]; Tamimi, Mazin ^[1]; Huq, Ashfia ^[2]; McIntosh, Steven ^[1]

Lehigh Univ., Bethlehem, PA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 LaSr₃Co_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 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 La_0.3Sr_2.7CoFeO_7-δ > LaSr₃Co_1.5Fe_1.5O_10-δ > LaSrCo_0.5Fe_0.5O_4-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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1261475

Journal Information:: Journal of Materials Chemistry. A, Vol. 3, Issue 43; ISSN 2050-7488

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 39 works

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