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Revisiting the thermal and chemical expansion and stability of La0.6Sr0.4FeO3−

de Leeuwe, Christopher; Hu, Wenting; Neagu, Dragos; Papaioannou, Evangelos I.; Pramana, Stevin; Ray, Brian; Evans, John S.O.; Metcalfe, Ian S.

Revisiting the thermal and chemical expansion and stability of La0.6Sr0.4FeO3− Thumbnail


Authors

Christopher de Leeuwe

Wenting Hu

Dragos Neagu

Evangelos I. Papaioannou

Stevin Pramana

Brian Ray

Ian S. Metcalfe



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.

Citation

de Leeuwe, C., Hu, W., Neagu, D., Papaioannou, E. I., Pramana, S., Ray, B., …Metcalfe, I. S. (2021). Revisiting the thermal and chemical expansion and stability of La0.6Sr0.4FeO3−. Journal of Solid State Chemistry, 293, Article 121838. https://doi.org/10.1016/j.jssc.2020.121838

Journal Article Type Article
Acceptance Date Oct 26, 2020
Online Publication Date Nov 6, 2020
Publication Date 2021-01
Deposit Date Nov 26, 2020
Publicly Available Date Nov 30, 2021
Journal Journal of Solid State Chemistry
Print ISSN 0022-4596
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 293
Article Number 121838
DOI https://doi.org/10.1016/j.jssc.2020.121838

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