A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain

A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain

SrVO<sub>2</sub>H, obtained by a topochemical reaction of SrVO<sub>3</sub> perovskite using CaH<sub>2</sub>, is an anion-ordered phase with hydride anions exclusively at the apical site. In this study, we conducted a CaH<sub>2</sub> reduction of SrVO&l...

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Main Authors: Morito Namba, Hiroshi Takatsu, Wataru Yoshimune, Aurélien Daniel, Shoichi Itoh, Takahito Terashima, Hiroshi Kageyama
Format: Article
Language:English
Published: MDPI AG 2020-04-01
Series:Inorganics
Subjects:
oxyhydrides
SrVO<sub>2</sub>H
thin film
epitaxial strain
<i>cis</i>/<i>trans</i> configuration
order–disorder
Online Access:https://www.mdpi.com/2304-6740/8/4/26
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spelling doaj-ec64bb969b9443a982172a811e2783d32020-11-25T02:58:38ZengMDPI AGInorganics2304-67402020-04-018262610.3390/inorganics8040026A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile StrainMorito Namba0Hiroshi Takatsu1Wataru Yoshimune2Aurélien Daniel3Shoichi Itoh4Takahito Terashima5Hiroshi Kageyama6Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, JapanDepartment of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, JapanDepartment of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, JapanDepartment of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, JapanDepartment of Earth and Planetary Sciences, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, JapanDepartment of Physics, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, JapanDepartment of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, JapanSrVO<sub>2</sub>H, obtained by a topochemical reaction of SrVO<sub>3</sub> perovskite using CaH<sub>2</sub>, is an anion-ordered phase with hydride anions exclusively at the apical site. In this study, we conducted a CaH<sub>2</sub> reduction of SrVO<sub>3</sub> thin films epitaxially grown on KTaO<sub>3</sub> (KTO) substrates. When reacted at 530 °C for 12 h, we observed an intermediate phase characterized by a smaller tetragonality of <i>c</i>/<i>a</i> = 0.96 (vs. <i>c</i>/<i>a</i> = 0.93 for SrVO<sub>2</sub>H), while a longer reaction of 24 h resulted in the known phase of SrVO<sub>2</sub>H. 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 SrVO<sub>2</sub>H, 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.https://www.mdpi.com/2304-6740/8/4/26oxyhydridesSrVO<sub>2</sub>Hthin filmepitaxial strain<i>cis</i>/<i>trans</i> configurationorder–disorder
collection DOAJ
language English
format Article
sources DOAJ
author Morito Namba
Hiroshi Takatsu
Wataru Yoshimune
Aurélien Daniel
Shoichi Itoh
Takahito Terashima
Hiroshi Kageyama
spellingShingle Morito Namba
Hiroshi Takatsu
Wataru Yoshimune
Aurélien Daniel
Shoichi Itoh
Takahito Terashima
Hiroshi Kageyama
A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
Inorganics
oxyhydrides
SrVO<sub>2</sub>H
thin film
epitaxial strain
<i>cis</i>/<i>trans</i> configuration
order–disorder
author_facet Morito Namba
Hiroshi Takatsu
Wataru Yoshimune
Aurélien Daniel
Shoichi Itoh
Takahito Terashima
Hiroshi Kageyama
author_sort Morito Namba
title A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
title_short A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
title_full A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
title_fullStr A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
title_full_unstemmed A Partial Anion Disorder in SrVO<sub>2</sub>H Induced by Biaxial Tensile Strain
title_sort partial anion disorder in srvo<sub>2</sub>h induced by biaxial tensile strain
publisher MDPI AG
series Inorganics
issn 2304-6740
publishDate 2020-04-01
description SrVO<sub>2</sub>H, obtained by a topochemical reaction of SrVO<sub>3</sub> perovskite using CaH<sub>2</sub>, is an anion-ordered phase with hydride anions exclusively at the apical site. In this study, we conducted a CaH<sub>2</sub> reduction of SrVO<sub>3</sub> thin films epitaxially grown on KTaO<sub>3</sub> (KTO) substrates. When reacted at 530 °C for 12 h, we observed an intermediate phase characterized by a smaller tetragonality of <i>c</i>/<i>a</i> = 0.96 (vs. <i>c</i>/<i>a</i> = 0.93 for SrVO<sub>2</sub>H), while a longer reaction of 24 h resulted in the known phase of SrVO<sub>2</sub>H. 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 SrVO<sub>2</sub>H, 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.
topic oxyhydrides
SrVO<sub>2</sub>H
thin film
epitaxial strain
<i>cis</i>/<i>trans</i> configuration
order–disorder
url https://www.mdpi.com/2304-6740/8/4/26
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