Journal Article

FZJ-2021-04437

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Migration Kinetics of Surface Ions in Oxygen‐Deficient Perovskite During Topotactic Transitions

Cao, L. (Corresponding author)FZJ* ; Petracic, O.FZJ* ; Wei, X.-K.FZJ* ; Zhang, H. ; Duchoň, T.FZJ* ; Gunkel, F.FZJ* ; Koutsioumpas, A.FZJ* ; Zhernenkov, K.FZJ* ; Rushchanskii, K. Z.FZJ* ; Hartmann, H.FZJ* ; Wilhelm, M. ; Li, Z. ; Xie, Y. ; He, S.FZJ* ; Weber, M. L.FZJ* ; Veltruská, K. ; Stellhorn, A.FZJ* ; Mayer, J.FZJ* ; Zhou, S. ; Brückel, T.FZJ*

2021
Wiley-VCH Weinheim

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/29668  doi:10.1002/smll.202104356

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.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Condensed Matter Physics (2nd) ; Crystallography (2nd) ; Materials Science (2nd)

---

Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)
3. Elektronische Eigenschaften (PGI-6)
4. Elektronische Materialien (PGI-7)
5. JCNS-FRM-II (JCNS-FRM-II)
6. Quanten-Theorie der Materialien (PGI-1)
7. Analytik (ZEA-3)
8. Streumethoden (PGI-4)
9. JARA-FIT (JARA-FIT)

Research Program(s):

1. 5233 - Memristive Materials and Devices (POF4-523) (POF4-523)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
3. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Experiment(s):

1. MARIA: Magnetic reflectometer with high incident angle (NL5N)

Appears in the scientific report 2021

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---