Temperature effect on surface structure of single crystal SrLaAlO4(001)

Author:

Mousley P.1ORCID,Nicklin C.1ORCID,Pramana S. S.2ORCID,van den Bosch C.34,Ryan M. P.3ORCID,Skinner S. J.3ORCID

Affiliation:

1. Diamond Light Source Ltd 1 , Didcot , OX11 0DE, United Kingdom

2. School of Engineering, Merz Court, Newcastle University 2 , Newcastle Upon Tyne NE1 7RU, United Kingdom

3. Department of Materials, Imperial College London 3 , Exhibition Road, London SW7 2AZ, United Kingdom

4. 4 Department of Chemical Engineering and Biotechnology, Cambridge, CB3 0AS, United Kingdom

Abstract

Development of next-generation electrochemical devices, such as solid oxide cells, requires control of the charge transfer processes across key interfaces. Structural strain at electrolyte:electrode interfaces could potentially alter the devices’ charge transport properties, therefore understanding the structural behavior of electrode surfaces under operating conditions is important. The functional oxide single crystal substrate SrLaAlO4 has been well-characterized with bulk structure studies; however, there are very few studies of SrLaAlO4 surface structures. Here, we present an investigation of the surface structure of SrLaAlO4 (001) substrates using surface x-ray diffraction under UHV conditions (10−10 Torr) with the substrate held at either room temperature or 650 °C. Best-fit models using a 1:1 ratio of Sr:La showed significant distortions to the surface AlO6 octahedra.

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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