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Title:
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Oxygen stoichiometry and chemical expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-d measured by in situ neutron diffraction
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Author(s):
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Published by:
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Publication date:
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ECN
Energy Efficiency in Industry
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1-5-2006
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ECN report number:
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Document type:
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ECN-RX--06-080
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Article (scientific)
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Number of pages:
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8
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Published in: Chemistry of Materials (American Chemical Society), , 2006, Vol.18, p.2187-2193.
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.
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