TY - JOUR
T1 - Revisiting the thermal and chemical expansion and stability of La0.6Sr0.4FeO3−δ
AU - de Leeuwe, Christopher
AU - Hu, Wenting
AU - Neagu, Dragos
AU - Papaioannou, Evangelos I.
AU - Pramana, Stevin
AU - Ray, Brian
AU - Evans, John S.O.
AU - Metcalfe, Ian S.
PY - 2021/1/31
Y1 - 2021/1/31
N2 - The thermal and chemical expansivity of La1-xSrxFeO3-δ (x = 0.4) was measured using in situ powder neutron and synchrotron X-ray diffraction at temperatures between 932 K and 1170 K and oxygen partial pressures, PO2, between 10−19 bar and 0.1 bar, giving a wide range of oxygen non-stoichiometry from δ = 0.05 to 0.22. Changes in δ were measured independently using gas analysis. This PO2 and temperature range covers the material's use as a chemical looping oxygen carrier, a sensor material and in solid oxide fuel cells. Thermal and chemical expansivities were found to be dependent on the oxygen non-stoichiometry, δ. For δ < 0.2 and T = 932–1050 K, the linear thermal expansivity was 5.72(4) × 10−5 Å/K and the linear chemical expansivity was 0.144(9) Å per unit change in δ. For δ > 0.2 and T = 973–1173 K, the linear thermal expansivity increases to 6.18(8) × 10−5 Å/K. For δ > 0.2, the linear chemical expansivity varies with both δ and temperature.
AB - The thermal and chemical expansivity of La1-xSrxFeO3-δ (x = 0.4) was measured using in situ powder neutron and synchrotron X-ray diffraction at temperatures between 932 K and 1170 K and oxygen partial pressures, PO2, between 10−19 bar and 0.1 bar, giving a wide range of oxygen non-stoichiometry from δ = 0.05 to 0.22. Changes in δ were measured independently using gas analysis. This PO2 and temperature range covers the material's use as a chemical looping oxygen carrier, a sensor material and in solid oxide fuel cells. Thermal and chemical expansivities were found to be dependent on the oxygen non-stoichiometry, δ. For δ < 0.2 and T = 932–1050 K, the linear thermal expansivity was 5.72(4) × 10−5 Å/K and the linear chemical expansivity was 0.144(9) Å per unit change in δ. For δ > 0.2 and T = 973–1173 K, the linear thermal expansivity increases to 6.18(8) × 10−5 Å/K. For δ > 0.2, the linear chemical expansivity varies with both δ and temperature.
KW - chemical expansivity
KW - chemical looping
KW - membrane
KW - mixed ionic electronic conductor
KW - SOFC cathode
KW - strontium-doped lanthanum ferrite
KW - thermal expansivity
UR - http://www.scopus.com/inward/record.url?scp=85096130978&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2020.121838
DO - 10.1016/j.jssc.2020.121838
M3 - Article
AN - SCOPUS:85096130978
SN - 0022-4596
VL - 293
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
M1 - 121838
ER -