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The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ.

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Title: The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ.
Authors: Malyshkin, Dmitry1,2 (AUTHOR) dmitry.malyshkin@urfu.ru, Novikov, Andrey1 (AUTHOR), Ivanov, Ivan1 (AUTHOR), Sereda, Vladimir1,2 (AUTHOR), Tsvetkov, Dmitry1 (AUTHOR), Zuev, Andrey1 (AUTHOR)
Source: Journal of Alloys & Compounds. Dec2020, Vol. 845, pN.PAG-N.PAG. 1p.
Subjects: Composite materials, Crystal lattices, Perovskite, Electric conductivity, Methane hydrates, Water, Case studies
Abstract: Some layered double perovskite cobaltites have been shown recently to absorb water and exhibit increasing electrical conductivity in humid atmospheres. However, the assumptions that their crystal lattice is capable of proton uptake, and that these oxides really possess triple (oxide ion, protonic and electronic) conductivity, have already been brought into question. We investigated in detail the crystal structure and phase composition of various lanthanum-substituted GdBaCo 2 O 6−δ and came to several important conclusions. Firstly, in oxidative conditions (e.g. in air), the substitution of La for either only Gd or only Ba in GdBaCo 2 O 6−δ results in formation of multiphase materials. For example, BaCo 1– x Gd x O 3−δ exsolves from Gd 1– x La x BaCo 2 O 6−δ due to the redistribution of La between Gd and Ba sites in Gd 1– x La x BaCo 2 O 6−δ lattice. Secondly, a single-phase double perovskite can be synthesized in air only by simultaneously substituting, within certain limits, both Gd and Ba in GdBaCo 2 O 6−δ with La. Finally, using Gd 0.8 La 0.2 Ba 0.95 La 0.05 Co 2 O 6−δ and BaCo 0.8 Gd 0.2 O 3−δ as examples, we demonstrated that while single-phase double perovskite does not hydrate, in the same conditions, the cubic perovskite BaCo 0.8 Gd 0.2 O 3−δ (BaCo 1– x Gd x O 3−δ is encountered in Gd 1– x La x BaCo 2 O 6−δ as an impurity) absorbs significant amount of water. Thus, the water uptake by lanthanum-substituted GdBaCo 2 O 6−δ is most likely to occur due to the impurities, and not the main double perovskite phase. • Substitution of La for only Gd or only Ba in GdBaCo 2 O 6−δ yields multiphase materials. • Single-phase simultaneously substituted Gd 1– x La x Ba 1– y La y Co 2 O 6−δ can be synthesized. • Water uptake by Gd 1– x La x BaCo 2 O 6−δ is most likely due to impurities. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 145438007
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  Data: The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ.
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  Data: <searchLink fieldCode="AR" term="%22Malyshkin%2C+Dmitry%22">Malyshkin, Dmitry</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> dmitry.malyshkin@urfu.ru</i><br /><searchLink fieldCode="AR" term="%22Novikov%2C+Andrey%22">Novikov, Andrey</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ivanov%2C+Ivan%22">Ivanov, Ivan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sereda%2C+Vladimir%22">Sereda, Vladimir</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tsvetkov%2C+Dmitry%22">Tsvetkov, Dmitry</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zuev%2C+Andrey%22">Zuev, Andrey</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Alloys+%26+Compounds%22">Journal of Alloys & Compounds</searchLink>. Dec2020, Vol. 845, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+lattices%22">Crystal lattices</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Methane+hydrates%22">Methane hydrates</searchLink><br /><searchLink fieldCode="DE" term="%22Water%22">Water</searchLink><br /><searchLink fieldCode="DE" term="%22Case+studies%22">Case studies</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Some layered double perovskite cobaltites have been shown recently to absorb water and exhibit increasing electrical conductivity in humid atmospheres. However, the assumptions that their crystal lattice is capable of proton uptake, and that these oxides really possess triple (oxide ion, protonic and electronic) conductivity, have already been brought into question. We investigated in detail the crystal structure and phase composition of various lanthanum-substituted GdBaCo 2 O 6−δ and came to several important conclusions. Firstly, in oxidative conditions (e.g. in air), the substitution of La for either only Gd or only Ba in GdBaCo 2 O 6−δ results in formation of multiphase materials. For example, BaCo 1– x Gd x O 3−δ exsolves from Gd 1– x La x BaCo 2 O 6−δ due to the redistribution of La between Gd and Ba sites in Gd 1– x La x BaCo 2 O 6−δ lattice. Secondly, a single-phase double perovskite can be synthesized in air only by simultaneously substituting, within certain limits, both Gd and Ba in GdBaCo 2 O 6−δ with La. Finally, using Gd 0.8 La 0.2 Ba 0.95 La 0.05 Co 2 O 6−δ and BaCo 0.8 Gd 0.2 O 3−δ as examples, we demonstrated that while single-phase double perovskite does not hydrate, in the same conditions, the cubic perovskite BaCo 0.8 Gd 0.2 O 3−δ (BaCo 1– x Gd x O 3−δ is encountered in Gd 1– x La x BaCo 2 O 6−δ as an impurity) absorbs significant amount of water. Thus, the water uptake by lanthanum-substituted GdBaCo 2 O 6−δ is most likely to occur due to the impurities, and not the main double perovskite phase. • Substitution of La for only Gd or only Ba in GdBaCo 2 O 6−δ yields multiphase materials. • Single-phase simultaneously substituted Gd 1– x La x Ba 1– y La y Co 2 O 6−δ can be synthesized. • Water uptake by Gd 1– x La x BaCo 2 O 6−δ is most likely due to impurities. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Alloys & Compounds is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jallcom.2020.156309
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Composite materials
        Type: general
      – SubjectFull: Crystal lattices
        Type: general
      – SubjectFull: Perovskite
        Type: general
      – SubjectFull: Electric conductivity
        Type: general
      – SubjectFull: Methane hydrates
        Type: general
      – SubjectFull: Water
        Type: general
      – SubjectFull: Case studies
        Type: general
    Titles:
      – TitleFull: The origin of triple conductivity and water uptake in layered double perovskites: A case study on lanthanum-substituted GdBaCo2O6−δ.
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            NameFull: Malyshkin, Dmitry
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            NameFull: Novikov, Andrey
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            NameFull: Ivanov, Ivan
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            NameFull: Sereda, Vladimir
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            NameFull: Tsvetkov, Dmitry
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            NameFull: Zuev, Andrey
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            – D: 10
              M: 12
              Text: Dec2020
              Type: published
              Y: 2020
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              Value: 09258388
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              Value: 845
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            – TitleFull: Journal of Alloys & Compounds
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