Journal
JOURNAL OF PHYSICS-ENERGY
Volume 4, Issue 4, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2515-7655/ac98df
Keywords
oxygen mass transport; thin films; point defects; lanthanum manganite; antisite defects
Funding
- European Union's Horizon 2020 research and innovation program [101017709]
- Generalitat de Catalunya [2017 SGR 1421]
- MINECO (Spain) [IJC2018-037698-I]
- MICIIN [PID2019-106165GB-C21, RED2018-102609-T]
- AGAUR [2021 FI_B 00157]
- German Research Foundation (DFG) [DE 2854/12-1]
- German Research Foundation (DFG) from collaborative research center [SFB917]
- Spanish Ministry of Economy, Industry and Competitiveness [PID2019-108573GB-C21]
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This study investigates the impact of Mn deficiency on oxygen mass transport properties in perovskite oxides, and highlights the importance of antisite defects in mitigating the effects of nonstoichiometry on oxygen transport.
Oxygen mass transport in perovskite oxides is relevant for a variety of energy and information technologies. In oxide thin films, cation nonstoichiometry is often found but its impact on the oxygen transport properties is not well understood. Here, we used oxygen isotope exchange depth profile technique coupled with secondary ion mass spectrometry to study oxygen mass transport and the defect compensation mechanism of Mn-deficient La0.8Sr0.2Mn (y) O-3 +/-delta epitaxial thin films. Oxygen diffusivity and surface exchange coefficients were observed to be consistent with literature measurements and to be independent on the degree of Mn deficiency in the layers. Defect chemistry modeling, together with a collection of different experimental techniques, suggests that the Mn-deficiency is mainly compensated by the formation of La-x(Mn) antisite defects. The results highlight the importance of antisite defects in perovskite thin films for mitigating cationic nonstoichiometry effects on oxygen mass transport properties.
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