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Sr2GaScO5, Sr10Ga6S...
Sr2GaScO5, Sr10Ga6Sc4O25, and SrGa0,75Sc0,25O2,5: a Play in the Octahedra to Tetrahedra Ratio in Oxygen-Deficient Perovskites
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- Chernov, S. V. (författare)
- Russian Academy of Sciences
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- Dobrovolsky, Y. A. (författare)
- Russian Academy of Sciences
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- Istomin, S. Y. (författare)
- M. V. Lomonosov Moscow State University
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- Antipov, E. V. (författare)
- M. V. Lomonosov Moscow State University
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- Grins, Jekabs (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Svensson, Gunnar, 1960- (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University
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- Tarakina, N. V. (författare)
- Julius-Maximilians Universität Würzburg,University of Würzburg,Universiteit Antwerpen,University of Antwerp
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- Abakumov, A. M. (författare)
- Universiteit Antwerpen,University of Antwerp
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- Van Tendeloo, G. (författare)
- Universiteit Antwerpen,University of Antwerp
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- Eriksson, Sten, 1958 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Rahman, Seikh Mohammad Habibur, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Russian Academy of Sciences M V. Lomonosov Moscow State University (creator_code:org_t)
- 2011-12-22
- 2012
- Engelska.
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Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 51:2, s. 1094-1103
- Relaterad länk:
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http://dx.doi.org/10...
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http://su.diva-porta...
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https://su.diva-port... (primary) (Raw object)
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https://doi.org/10.1...
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https://research.cha...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Three different perovskite-related phases were isolated in the SrGa(1-x)Sc(x)O(2.5) system: Sr(2)GaScO(5), Sr(10)Ga(6)Sc(4)O(25), and SrGa(0.75)Sc(0.25)O(2.5), Sr(2)GaScO(5) (x = 0.5) crystallizes in a brownrnillerite-type structure [space group (S.G.) Icmm, a = 5.91048(5) angstrom, b = 15.1594(1) angstrom, and c = 5.70926(4) angstrom] with complete ordering of Sc(3+) and Ga(3+) over octahedral and tetrahedral positions, respectively. The crystal structure of Sr(10)Ga(6)Sc(4)O(25) (x = 0.4) was determined by the Monte Carlo method and refined using a combination of X-ray, neutron, and electron diffraction data [S.G. I4(1)/a, a = 17.517(1) angstrom, c = 32.830(3) angstrom]. It represents a novel type of ordering of the B cations and oxygen vacancies in perovskites. The crystal structure of Sr(10)Ga(6)Sc(4)O(25) can be described as a stacking of eight perovskite layers along the c axis ...[-(Sc/Ga)O(1.6)-SrO(0.8)-(Sc/Ga)O(1.8)-SrO(0.8)-](2 center dot center dot center dot) Similar to Sr(2)GaScO(5), this structure features a complete ordering of the Sc(3+) and Ga(3+) cations over octahedral and tetrahedral positions, respectively, within each layer. A specific feature of the crystal structure of Sr(10)Ga(6)Sc(4)O(25) is that one-third of the tetrahedra have one vertex not connected with other Sc/Ga cations. Further partial replacement of Sc(3+) by Ga(3+) leads to the formation of the cubic perovskite phase SrGa(0.75)Sc(0.25)O(2.5) (x = 0.25) with a = 3.9817(4) angstrom. This compound incorporates water molecules in the structure forming SrGa(0.75)Sc(0.25)O(2.5)center dot xH(2)O hydrate, which exhibits a proton conductivity of similar to 2.0 x 10(-6) S/cm at 673 K.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- brownmillerite
- ceramics
- defect perovskite
- neutron-diffraction
- crystal-structure
- magnetic-structure
- oxide-ion conductivity
- protonic conduction
- la
- sr2mn2o5
- doped lasco3
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Chernov, S. V.
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Dobrovolsky, Y. ...
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Istomin, S. Y.
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Antipov, E. V.
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Grins, Jekabs
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Svensson, Gunnar ...
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Tarakina, N. V.
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Abakumov, A. M.
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Van Tendeloo, G.
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Eriksson, Sten, ...
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Rahman, Seikh Mo ...
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Inorganic Chemis ...
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Chalmers tekniska högskola
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Stockholms universitet