Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)

The structure of BaLnCoO (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy) was studied by the means of synchrotron radiation powder X-ray diffraction, neutron powder diffraction and Transmission Electron Microscopy (TEM), while water uptake properties were analysed with the use of thermogravimetry (TG) and water...

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Authors: Wachowski, S.L., Szpunar, I., Sørby, Magnus H., Mielewczyk-Gry¿, A, Balaguer, María, Ghica, C., Istrate, M.C., Gazda, M., Gunnæs, A.E., Serra Alfaro, José Manuel, Norby, Truls, Strandbakke, R.
Format: article
Status:Versión aceptada para publicación
Publication Date:2020
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/226393
Online Access:http://hdl.handle.net/10261/226393
Access Level:Open access
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spelling Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)Wachowski, S.L.Szpunar, I.Sørby, Magnus H.Mielewczyk-Gry¿, ABalaguer, MaríaGhica, C.Istrate, M.C.Gazda, M.Gunnæs, A.E.Serra Alfaro, José ManuelNorby, TrulsStrandbakke, R.The structure of BaLnCoO (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy) was studied by the means of synchrotron radiation powder X-ray diffraction, neutron powder diffraction and Transmission Electron Microscopy (TEM), while water uptake properties were analysed with the use of thermogravimetry (TG) and water adsorption isotherms. The structure refinement revealed that the dominant phase in all compositions was orthorhombic with an ordering of the A-site cations along the c-axis and ordering of oxygen vacancies along the b-axis, which was also directly evidenced by TEM. It was shown that both unit cell volume and average Co-oxidation state at room temperature decrease linearly with decreasing Ln radius. TG water uptake experiments in humidified N–O gas mixture at 300 °C revealed that among all compositions, only BaLaCoO and BaGdCoO exhibit significant water uptake. Surface water adsorption studies showed that the α, a normalised parameter reflecting the surface hydrophilicity, mostly independently of Ln radius was close to 0.5, which means that the surface is neither hydrophobic nor hydrophilic. The results indicated that water uptake observed at 300 °C is a bulk process, which cannot be described by standard hydration/hydrogenation reaction and it is related to the layered structure of the perovskite lattice and characteristic to La or Gd being present in the lattice.The research has been supported by the National Science Centre Poland (2016/22/Z/ST5/00691), the Spanish Government (PCIN-2017-125), and the Research Council of Norway (Grant nᵒ 272797 “GoPHy MiCO”) through the M-ERA.NET Joint Call 2016. Funding from the Spanish Government (RTI2018-102161 and IJCI-2017-34110 grant) is kindly acknowledged. The authors acknowledge the skilful assistance from the staff of the Swiss–Norwegian Beamline (SNBL), at the European Synchrotron Radiation Facility (ESRF), Grenoble, France. Dr Cheng Li is at POWGEN, SNS, Oak Ridge, US and Dr Chiu C. Tang at beamline I11 at Diamond, Didcot, UK are gratefully acknowledged for PND and SR-PXD measurements, respectively, of BaGdCo2O6-δ. SLW and AMG acknowledge the CERIC-ERIC Consortium for the access to experimental facilities and the financial support (No 20187079). CG and MCI acknowledge the financial support from Romanian Ministry of Research and Innovation in the frame of the Core Program PN19-03. SLW would like to express gratitude to Małgorzata Nadolska from Gdańsk University of Technology for support in surface measurements and analysis.Elsevier BVMinisterio de Ciencia, Innovación y Universidades (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2021202120202021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/226393reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-102161http://dx.doi.org/10.1016/j.actamat.2020.08.018Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2263932026-05-22T06:33:51Z
dc.title.none.fl_str_mv Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
title Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
spellingShingle Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
Wachowski, S.L.
title_short Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
title_full Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
title_fullStr Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
title_full_unstemmed Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
title_sort Structure and water uptake in BaLnCo2O6−δ (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy)
dc.creator.none.fl_str_mv Wachowski, S.L.
Szpunar, I.
Sørby, Magnus H.
Mielewczyk-Gry¿, A
Balaguer, María
Ghica, C.
Istrate, M.C.
Gazda, M.
Gunnæs, A.E.
Serra Alfaro, José Manuel
Norby, Truls
Strandbakke, R.
author Wachowski, S.L.
author_facet Wachowski, S.L.
Szpunar, I.
Sørby, Magnus H.
Mielewczyk-Gry¿, A
Balaguer, María
Ghica, C.
Istrate, M.C.
Gazda, M.
Gunnæs, A.E.
Serra Alfaro, José Manuel
Norby, Truls
Strandbakke, R.
author_role author
author2 Szpunar, I.
Sørby, Magnus H.
Mielewczyk-Gry¿, A
Balaguer, María
Ghica, C.
Istrate, M.C.
Gazda, M.
Gunnæs, A.E.
Serra Alfaro, José Manuel
Norby, Truls
Strandbakke, R.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description The structure of BaLnCoO (Ln =La, Pr, Nd, Sm, Gd, Tb and Dy) was studied by the means of synchrotron radiation powder X-ray diffraction, neutron powder diffraction and Transmission Electron Microscopy (TEM), while water uptake properties were analysed with the use of thermogravimetry (TG) and water adsorption isotherms. The structure refinement revealed that the dominant phase in all compositions was orthorhombic with an ordering of the A-site cations along the c-axis and ordering of oxygen vacancies along the b-axis, which was also directly evidenced by TEM. It was shown that both unit cell volume and average Co-oxidation state at room temperature decrease linearly with decreasing Ln radius. TG water uptake experiments in humidified N–O gas mixture at 300 °C revealed that among all compositions, only BaLaCoO and BaGdCoO exhibit significant water uptake. Surface water adsorption studies showed that the α, a normalised parameter reflecting the surface hydrophilicity, mostly independently of Ln radius was close to 0.5, which means that the surface is neither hydrophobic nor hydrophilic. The results indicated that water uptake observed at 300 °C is a bulk process, which cannot be described by standard hydration/hydrogenation reaction and it is related to the layered structure of the perovskite lattice and characteristic to La or Gd being present in the lattice.
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/226393
url http://hdl.handle.net/10261/226393
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-102161
http://dx.doi.org/10.1016/j.actamat.2020.08.018
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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