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Persistent URL http://purl.org/net/epubs/work/47770423
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Record Id 47770423
Title Revisiting the thermal and chemical expansion and stability of La0.6Sr0.4FeO3−δ
Abstract 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, , 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 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.
Organisation ISIS , ISIS-HRPD , STFC
Funding Information ERC (FP/2007–2013); ERC (320725); EPSRC (EP/P007767/1); EPSRC (EP/P024807/1)
Related Research Object(s): 10.5286/ISIS.E.86390351
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article J Solid State Chem 293 (2021): 121838. doi:10.1016/j.jssc.2020.121838 2021