The impact of Mn nonstoichiometry on the oxygen mass transport properties of La0.8Sr0.2Mn y O3±δ thin films

Francesco M. Chiabrera, Federico Baiutti, Jacqueline M. Börgers, George F. Harrington, Lluís Yedra, Maciej O. Liedke, Joe Kler, Pranjal Nandi, Juan de Dios Sirvent, Jose Santiso, Miguel López-Haro, José J. Calvino, Sonia Estradé, Maik Butterling, Andreas Wagner, Francesca Peiró, Roger A. De Souza, Albert Tarancón

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

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 O3±δ 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 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.

Original languageEnglish
Article number044011
Number of pages13
JournalJPhys Energy
Volume4
Issue number4
DOIs
Publication statusPublished - 24 Oct 2022

Bibliographical note

Funding Information:
This research was supported by the funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 101017709 (EPISTORE) and the ‘Generalitat de Catalunya’ (2017 SGR 1421, NANOEN). LY acknowledges support from the MINECO (Spain) through the IJC2018-037698-I grant. MICIIN projects PID2019-106165GB-C21 and RED2018-102609-T are also acknowledged. PN acknowledges the support from the AGAUR through the 2021 FI_B 00157 Grant. RADS acknowledges funding from German Research Foundation (DFG) from project DE 2854/12-1 and from the collaborative research center SFB917 ‘Nanoswitches’. J S acknowledges the financial support of the Spanish Ministry of Economy, Industry and Competitiveness (Project: PID2019-108573GB-C21). Parts of this research were carried out at ELBE at the Helmholtz-Zentrum Dresden-Rossendorf e. V, a member of the Helmholtz Association. We would like to thank the facility staff (Ahmed G Attallah and Eric Hirschmann) for assistance.

Data availability statement
The data that support the findings of this study are available upon reasonable request from the authors.

Keywords

  • antisite defects
  • lanthanum manganite
  • oxygen mass transport
  • point defects
  • thin films

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • General Energy
  • Materials Chemistry

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