Phases in the system Ba2M2-xCuxO4+δ, M = In, Sc: Structure and Oxygen Stoichiometry

D. H. Gregory; M. T. Weller

doi:10.1006/jssc.1993.1331

Phases in the system Ba₂M_2-xCu_xO_4+δ, M = In, Sc: Structure and Oxygen Stoichiometry

D. H. Gregory, M. T. Weller

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55 Citations (Scopus)

Abstract

Members of the series Ba₂M_2-x, Cu_x O_4+δ, M = In, Sc (0 ≤ x ≤ 1), have been synthesised by solid-state reaction methods and products characterized by powder X-ray diffraction (PXD). Selected compounds have been annealed under oxygen at 1 atm and oxygen stoichiometries for unannealed and oxygen annealed samples have been calculated following thermogravimetric analysis (TGA). Structures for M = In, x = 0, 0.5, 1 and M = Sc, x = 1 were determined by Rietveld analysis of PXD data. Ba₂In₂O₅ has been shown to crystallize in the orthorhombic space group Ibm2 (Brownmillerite structure) with a = 6.0956(1) Å, b = 16.7112(3) Å c = 5.9601(1) Å. The copper-containing phases adopt a tetragonal “doubled perovskite” structure built up of copper-substituted BaInO_2.5 cubes. The copper coordination and oxidation state can be controlled by varying the oxygen level of the structure.

Original language	English
Pages (from-to)	134-148
Number of pages	15
Journal	Journal of Solid State Chemistry
Volume	107
Issue number	1
DOIs	https://doi.org/10.1006/jssc.1993.1331
Publication status	Published - Nov 1993
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1006/jssc.1993.1331

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title = "Phases in the system Ba2M2-xCuxO4+δ, M = In, Sc: Structure and Oxygen Stoichiometry",

abstract = "Members of the series Ba2M2-x, Cux O4+δ, M = In, Sc (0 ≤ x ≤ 1), have been synthesised by solid-state reaction methods and products characterized by powder X-ray diffraction (PXD). Selected compounds have been annealed under oxygen at 1 atm and oxygen stoichiometries for unannealed and oxygen annealed samples have been calculated following thermogravimetric analysis (TGA). Structures for M = In, x = 0, 0.5, 1 and M = Sc, x = 1 were determined by Rietveld analysis of PXD data. Ba2In2O5 has been shown to crystallize in the orthorhombic space group Ibm2 (Brownmillerite structure) with a = 6.0956(1) {\AA}, b = 16.7112(3) {\AA} c = 5.9601(1) {\AA}. The copper-containing phases adopt a tetragonal “doubled perovskite” structure built up of copper-substituted BaInO2.5 cubes. The copper coordination and oxidation state can be controlled by varying the oxygen level of the structure.",

author = "Gregory, {D. H.} and Weller, {M. T.}",

year = "1993",

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doi = "10.1006/jssc.1993.1331",

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T2 - Structure and Oxygen Stoichiometry

AU - Gregory, D. H.

AU - Weller, M. T.

PY - 1993/11

Y1 - 1993/11

N2 - Members of the series Ba2M2-x, Cux O4+δ, M = In, Sc (0 ≤ x ≤ 1), have been synthesised by solid-state reaction methods and products characterized by powder X-ray diffraction (PXD). Selected compounds have been annealed under oxygen at 1 atm and oxygen stoichiometries for unannealed and oxygen annealed samples have been calculated following thermogravimetric analysis (TGA). Structures for M = In, x = 0, 0.5, 1 and M = Sc, x = 1 were determined by Rietveld analysis of PXD data. Ba2In2O5 has been shown to crystallize in the orthorhombic space group Ibm2 (Brownmillerite structure) with a = 6.0956(1) Å, b = 16.7112(3) Å c = 5.9601(1) Å. The copper-containing phases adopt a tetragonal “doubled perovskite” structure built up of copper-substituted BaInO2.5 cubes. The copper coordination and oxidation state can be controlled by varying the oxygen level of the structure.

AB - Members of the series Ba2M2-x, Cux O4+δ, M = In, Sc (0 ≤ x ≤ 1), have been synthesised by solid-state reaction methods and products characterized by powder X-ray diffraction (PXD). Selected compounds have been annealed under oxygen at 1 atm and oxygen stoichiometries for unannealed and oxygen annealed samples have been calculated following thermogravimetric analysis (TGA). Structures for M = In, x = 0, 0.5, 1 and M = Sc, x = 1 were determined by Rietveld analysis of PXD data. Ba2In2O5 has been shown to crystallize in the orthorhombic space group Ibm2 (Brownmillerite structure) with a = 6.0956(1) Å, b = 16.7112(3) Å c = 5.9601(1) Å. The copper-containing phases adopt a tetragonal “doubled perovskite” structure built up of copper-substituted BaInO2.5 cubes. The copper coordination and oxidation state can be controlled by varying the oxygen level of the structure.

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Phases in the system Ba₂M_2-xCu_xO_4+δ, M = In, Sc: Structure and Oxygen Stoichiometry

Abstract

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