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

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)
Research Group:	Inorganic Materials Science (IMS) Inorganic Membranes (IM)
Link to this item:	http://purl.utwente.nl/publications/59190
Official URL:	http://dx.doi.org/10.1021/cm052763x
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