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Article

A Partial Anion Disorder in SrVO2H Induced by Biaxial Tensile Strain

1
Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
2
École Supérieure d’Ingénieurs de Rennes (ESIR), Université de Rennes 1, Campus de Beaulieu, 263, Avenue du Général Leclerc, 35042 Rennes CEDEX, France
3
Department of Earth and Planetary Sciences, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
4
Department of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
*
Authors to whom correspondence should be addressed.
Received: 16 March 2020 / Revised: 5 April 2020 / Accepted: 6 April 2020 / Published: 8 April 2020
(This article belongs to the Section Inorganic Solid-State Chemistry)
SrVO2H, obtained by a topochemical reaction of SrVO3 perovskite using CaH2, is an anion-ordered phase with hydride anions exclusively at the apical site. In this study, we conducted a CaH2 reduction of SrVO3 thin films epitaxially grown on KTaO3 (KTO) substrates. When reacted at 530 °C for 12 h, we observed an intermediate phase characterized by a smaller tetragonality of c/a = 0.96 (vs. c/a = 0.93 for SrVO2H), while a longer reaction of 24 h resulted in the known phase of SrVO2H. This fact suggests that the intermediate phase is a metastable state stabilized by applying tensile strain from the KTO substrate (1.4%). In addition, secondary ion mass spectrometry (SIMS) revealed that the intermediate phase has a hydrogen content close to that of SrVO2H, suggesting a partially disordered anion arrangement. Such kinetic trapping of an intermediate state by biaxial epitaxial strain not only helps to acquire a new state of matter but also advances our understanding of topochemical reaction processes in extended solids. View Full-Text
Keywords: oxyhydrides; SrVO2H; thin film; epitaxial strain; cis/trans configuration; order–disorder oxyhydrides; SrVO2H; thin film; epitaxial strain; cis/trans configuration; order–disorder
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MDPI and ACS Style

Namba, M.; Takatsu, H.; Yoshimune, W.; Daniel, A.; Itoh, S.; Terashima, T.; Kageyama, H. A Partial Anion Disorder in SrVO2H Induced by Biaxial Tensile Strain. Inorganics 2020, 8, 26. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8040026

AMA Style

Namba M, Takatsu H, Yoshimune W, Daniel A, Itoh S, Terashima T, Kageyama H. A Partial Anion Disorder in SrVO2H Induced by Biaxial Tensile Strain. Inorganics. 2020; 8(4):26. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8040026

Chicago/Turabian Style

Namba, Morito, Hiroshi Takatsu, Wataru Yoshimune, Aurélien Daniel, Shoichi Itoh, Takahito Terashima, and Hiroshi Kageyama. 2020. "A Partial Anion Disorder in SrVO2H Induced by Biaxial Tensile Strain" Inorganics 8, no. 4: 26. https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics8040026

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