Oxygen Stoichiometry and Chemical Expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-ä Measured by in Situ Neutron Diffraction

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McIntosh, Steven and Vente, Jaap F. and Haije, Wim G. and Blank, Dave H.A. and Bouwmeester, Henny J.M. (2006) Oxygen Stoichiometry and Chemical Expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-ä Measured by in Situ Neutron Diffraction. Chemistry of Materials, 18 (8). pp. 2187-2193. ISSN 0897-4756

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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
Item Type:Article
Copyright:© 2006 American Chemical Society
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/59190
Official URL:http://dx.doi.org/10.1021/cm052763x
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