In situ X-ray and neutron diffraction of the Ruddlesden-Popper compounds (RE2-xSrx)0.98(Fe0.8Co0.2)1-yMgyO4-δ (RE=La, Pr): Structure and CO2 stability

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Abstract

The crystal structure of the Ruddlesden-Popper compounds (La 1.0Sr1.0)0.98Fe0.8Co 0.2O4-δ and (La1.2Sr0.8) 0.98(Fe0.8Co0.2)0.8Mg 0.2O4-δ was investigated at 1000 °C in N 2 (aO2=1×10-4) by in-situ powder neutron diffraction. In-situ powder X-ray diffraction (PXD) was also employed to investigate the temperature dependence of the lattice parameters of the compounds in air and the oxygen activity dependence of the lattice parameters at 800 °C and 1000 °C. The thermal and chemical expansion coefficients, determined along the two crystallographic directions of the tetragonal unit cell, are highly anisotropic. The equivalent pseudo-cubic thermal and chemical expansion coefficients are in agreement with values determined by dilatometry. The chemical stability in CO2 containing environments of various Ruddlesden-Popper compounds with chemical formula (RE2-xSr x)0.98(Fe0.8Co0.2) 1-yMgyO4-δ (RE=La, Pr), as well as their stability limit in H2/H2O=4.5 were also determined by in-situ PXD for x=0.9, 1.0 and y=0, 0.2. © 2013 Elsevier Inc. All rights reserved.
Original languageEnglish
JournalJournal of Solid State Chemistry
Volume201
Pages (from-to)164-171
ISSN0022-4596
DOIs
Publication statusPublished - 2013

Keywords

  • Carbon dioxide
  • Chemical compounds
  • Chemical stability
  • Cobalt compounds
  • Lanthanum
  • Lattice constants
  • Magnesium
  • Praseodymium
  • Rietveld refinement
  • Thermal expansion
  • X ray diffraction
  • Iron compounds
  • Ruddlesden–Popper
  • In-situ neutron diffraction
  • Chemical expansion
  • CO2 reactivity

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