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Lookup NU author(s): Chris de Leeuwe, Dr Wenting HuORCiD, Dr Dragos Neagu, Dr Evangelos Papaioannou, Dr Stevin PramanaORCiD, Dr Brian Ray, Professor Ian Metcalfe
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
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.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.
Author(s): de Leeuwe C, Hu W, Neagu D, Papaioannou EI, Pramana S, Ray B, Evans JSO, Metcalfe IS
Publication type: Article
Publication status: Published
Journal: Journal of Solid State Chemistry
Year: 2021
Volume: 293
Print publication date: 01/01/2021
Online publication date: 06/11/2020
Acceptance date: 26/10/2020
Date deposited: 10/12/2020
ISSN (print): 0022-4596
ISSN (electronic): 1095-726X
Publisher: Elsevier
URL: https://doi.org/10.1016/j.jssc.2020.121838
DOI: 10.1016/j.jssc.2020.121838
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