Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
version.2
Photoelectron holography characterization of protonated brownmillerite SrCoO2.5 epitaxial films
Daisuke KanYusuke HashimotoThanh Ngoc PhamLingling XieYosuke IsodaTomohiro MatsushitaYoshitada MorikawaYuichi Shimakawa
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JOURNAL OPEN ACCESS Advance online publication
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Article ID: 25062

version.2: July 10, 2025
version.1: May 28, 2025
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Abstract

We characterized protonated SrCoO2.5 epitaxial films by the photoelectron holography technique. We found that photoelectron holography patterns change due to cation displacements induced by electrochemical protonation. By simulating holography patterns based on structural models of the protonated SrCoO2.5 using machine-learning enhanced global optimization and comparing them with the experimentally observed patterns, we evaluated hydrogen concentration and cation displacements in protonated SrCoO2.5 films. Our results show that photoelectron holography is useful in characterizing protonation-induced changes in metal transition oxides.

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