Oxygen stoichiometry and chemical expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-d measured by in-situ neutron diffraction

Steven McIntosh, Jaap F. Vente, Wim G. Haije, Dave H.A. Blank, Henny J.M. Bouwmeester

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292 Citations (Scopus)

Abstract

The structure, oxygen stoichiometry, and chemical and thermal expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-ä (BSCF) between 873 and 1173 K and oxygen partial pressures of 1 10-3 to 1 atm were determined by in situ neutron diffraction. BSCF has a cubic perovskite structure, space group Pm3hm, across the whole T-pO2 region investigated. The material is highly oxygen deficient with a maximum oxygen stoichiometry (3 - ä) of 2.339(12) at 873 K and a pO2 of 1 atm and a minimum of 2.192(15) at 1173 K and a pO2 of 10-3 atm. Good agreement is obtained between oxygen stoichiometry data determined by neutron diffraction and thermogravimetry. In the range covered by the experiments, the thermal and chemical expansion coefficients are 19.0(5)-20.8(6) 10-6 K-1 and 0.016(2)-0.026(4), respectively
Original languageEnglish
Pages (from-to)2187-2193
Number of pages7
JournalChemistry of materials
Volume18
Issue number8
DOIs
Publication statusPublished - 2006

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