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Synthesis and chara...
Synthesis and characterization of perovskite-type Sr(x)Y1-xFeO(3-delta) (0.63 <= x < 1.0) and Sr0.75Y0.25Fe1-yMyO3-delta (M=Cr, Mn, Ni), (y=0.2, 0.33, 0.5)
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Biendicho, J. J. (author)
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Shafeie, S. (author)
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Frenck, L. (author)
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Gavrilova, D. (author)
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Boehme, S. (author)
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Bettanini, A. M. (author)
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- Svedlindh, Peter (author)
- Uppsala universitet,Fasta tillståndets fysik
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Hull, S. (author)
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- Zhao, Zhe (author)
- KTH,Keramteknologi
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Istomin, S. Ya. (author)
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Grins, J. (author)
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Svensson, G. (author)
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(creator_code:org_t)
- Elsevier BV, 2013
- 2013
- English.
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In: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 200, s. 30-38
- Related links:
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http://su.diva-porta...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Oxygen-deficient ferrates with the cubic perovskite structure SrxY1-xFeO3-delta were prepared in air (0.71 <= x <= 0.91) as well as in N-2 (x=0.75 and 0.79) at 1573 K. The oxygen content of the compounds prepared in air increases with increasing strontium content from 3-delta=2.79(2) for x=0.75 to 3-delta=2.83(2) for x=0.91. Refinement of the crystal structure of Sr0.25Y0.25FeO2.29 using TOP neutron powder diffraction (NPD) data shows high anisotropic atomic displacement parameter (ADP) for the oxygen atom resulting from a substantial cation and anion disorder. Electron diffraction (ED) and highresolution electron microscopy (HREM) studies of Sr0.75Y0.25FeO2.79 reveal a modulation along (1 0 0)(p) with G +/- similar to 0.4(1 0 0)(p) indicating a local ordering of oxygen vacancies. Magnetic susceptibility measurements at 5-390 K show spin-glass behaviour with dominating antiferromagnetic coupling between the magnetic moments of Fe cations. Among the studied compositions, Sr0.75Y0.25Fe02.79 shows the lowest thermal expansion coefficient (TEC) of 10.5 ppm/K in air at 298-673 K. At 773-1173 K TEC increases up to 17.2 ppm/K due to substantial reduction of oxygen content. The latter also results in a dramatic decrease of the electrical conductivity in air above 673 K. Partial substitution of Fe by Cr, Mn and Ni according to the formula Sr0.75Y0.25Fe1-yMyO3-delta (y=0.2, 0.33, 0.5) leads to cubic perovskites for all substituents with y=0.2. Their TECs are higher in comparison with un-doped Sr0.75Y0.25Fe02.79. Only M=Ni has increased electrical conductivity compared to un-doped Sr0.75Y0.25Fe02.79.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Perovskites
- Neutron diffraction
- Electron diffraction
- High-temperature conductivity
- Thermal expansion
- Magnetic susceptibility
- Teknisk fysik med inriktning mot fasta tillståndets fysik
- Engineering Science with specialization in Solid State Physics
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Biendicho, J. J.
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Shafeie, S.
-
Frenck, L.
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Gavrilova, D.
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Boehme, S.
-
Bettanini, A. M.
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show more...
-
Svedlindh, Peter
-
Hull, S.
-
Zhao, Zhe
-
Istomin, S. Ya.
-
Grins, J.
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Svensson, G.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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Journal of Solid ...
- By the university
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Uppsala University
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Royal Institute of Technology