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Titel:
Oxygen stoichiometry and chemical expansion of Ba0.5Sr0.5Co0.8Fe0.2O3-d measured by in situ neutron diffraction
 
Auteur(s):
Vente, J.F.; Haije, W.G.; Mcintosh, S.; Blank, D.H.A.; Bouwmeester, H.J.M.
 
Gepubliceerd door: Publicatie datum:
ECN Energie Efficiency in de Industrie 1-5-2006
 
ECN publicatienummer: Publicatie type:
ECN-RX--06-080 Artikel wetenschap tijdschrift
 
Aantal pagina's:
8  

Gepubliceerd in: Chemistry of Materials (American Chemical Society), , 2006, Vol.18, p.2187-2193.

Samenvatting:
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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