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journal article·2021-12Open access

Migration Kinetics of Surface Ions in Oxygen‐Deficient Perovskite During Topotactic Transitions

Lei Cao, Oleg Petracic, Xian‐Kui Wei, Hengbo Zhang, Tomáš Duchoň, Felix Gunkel, Alexandros Koutsioubas, Kirill Zhernenkov, Konstantin Z. Rushchanskii, Heinrich Hartmann, Marek Wilhelm, Zichao Li, Yufang Xie, Suqin He, Moritz L. Weber, Kateřina Veltruská, Annika Stellhorn, Joachim Mayer, Shengqiang Zhou, Thomas Brückel

Small· Volume 17· Issue 51
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Abstract

Abstract Oxygen diffusivity and surface exchange kinetics underpin the ionic, electronic, and catalytic functionalities of complex multivalent oxides. Towards understanding and controlling the kinetics of oxygen transport in emerging technologies, it is highly desirable to reveal the underlying lattice dynamics and ionic activities related to oxygen variation. In this study, the evolution of oxygen content is identified in real‐time during the progress of a topotactic phase transition in La0.7Sr0.3MnO3‐δ epitaxial thin films, both at the surface and throughout the bulk. Using polarized neutron reflectometry, a quantitative depth profile of the oxygen content gradient is achieved, which, alongside atomic‐resolution scanning transmission electron microscopy, uniquely reveals the formation of a novel structural phase near the surface. Surface‐sensitive X‐ray spectroscopies further confirm a significant change of the electronic structure accompanying the transition. The anisotropic features of this novel phase enable a distinct oxygen diffusion pathway in contrast to conventional observation of oxygen motion at moderate temperatures. The results provide insights furthering the design of solid oxygen ion conductors within the framework of topotactic phase transitions.
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Research context

Electronic materialsCatalysis & surfaces

OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Electronic and Structural Properties of Oxides · Ferroelectric and Piezoelectric Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Ion Beam Physics and Materials Research Helmholtz‐Zentrum Dresden‐Rossendorf 01328 Dresden Germany

School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055 China

Jülich Centre for Neutron Science (JCNS‐2) and Peter Grünberg Institut (PGI‐4) JARA‐FIT Forschungszentrum Jülich GmbH 52425 Jülich Germany

Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons Forschungszentrum Jülich GmbH 52425 Jülich Germany

Peter Grünberg Institut (PGI‐6) JARA‐FIT Forschungszentrum Jülich GmbH 52425 Jülich Germany

Peter Grünberg Institut (PGI‐7) JARA‐FIT Forschungszentrum Jülich GmbH 52425 Jülich Germany

Jülich Centre for Neutron Science (JCNS) at Heinz Maier‐Leibnitz Zentrum (MLZ) Forschungszentrum Jülich GmbH 85748 Garching Germany

Peter Grünberg Institute (PGI‐1) and Institute for Advanced Simulation (IAS‐1) Forschungszentrum Jülich GmbH 52425 Jülich Germany

Central Institute for Engineering Electronics and Analytics (ZEA‐3) 52425 Jülich Germany

Department of Surface and Plasma Science Faculty of Mathematics and Physics Charles University Prague 18000 Czech Republic

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