Structural investigations of ACu3Ru4O12 (A=Na, Ca, Sr, La, Nd) - A comparison between XRD-Rietveld and EXAFS results

S. G. Ebbinghaus; A. Weidenkaff; R. J. Cava

doi:10.1006/jssc.2002.9634

Structural investigations of ACu₃Ru₄O₁₂ (A=Na, Ca, Sr, La, Nd) - A comparison between XRD-Rietveld and EXAFS results

S. G. Ebbinghaus, A. Weidenkaff, R. J. Cava

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

The structures of five perovskite-related oxides with the general composition ACu₃Ru₄O₁₂ with A = Na, Ca, Sr, La and Nd, have been examined both by XRD-Rietveld refinements and Ru-K EXAFS-spectroscopy. In addition, the behavior on reduction was investigated by thermogravimetry (TG). The TG measurements revealed that the composition was almost exactly A₁Cu₃Ru₄O₁₂ for all samples. The inter-atomic distances derived from EXAFS- and XRD-Rietveld fits show an excellent agreement with differences smaller than 8 mÅ even for R > 5 Å. All inter-atomic distances increase in the order Na<Ca< Sr<Nd<La and were found to depend linearly on the product of charge and ionic radius of the A-cation. The experimentally found distances are compared with the corresponding values expected from bond-valence calculations.

Original language	English (US)
Pages (from-to)	126-136
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	167
Issue number	1
DOIs	https://doi.org/10.1006/jssc.2002.9634
State	Published - Aug 2002

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

Keywords

Cuprates
EXAFS
Perovskites
Rietveld structure refinements
Ruthenates

Access to Document

10.1006/jssc.2002.9634

Cite this

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title = "Structural investigations of ACu3Ru4O12 (A=Na, Ca, Sr, La, Nd) - A comparison between XRD-Rietveld and EXAFS results",

abstract = "The structures of five perovskite-related oxides with the general composition ACu3Ru4O12 with A = Na, Ca, Sr, La and Nd, have been examined both by XRD-Rietveld refinements and Ru-K EXAFS-spectroscopy. In addition, the behavior on reduction was investigated by thermogravimetry (TG). The TG measurements revealed that the composition was almost exactly A1Cu3Ru4O12 for all samples. The inter-atomic distances derived from EXAFS- and XRD-Rietveld fits show an excellent agreement with differences smaller than 8 m{\AA} even for R > 5 {\AA}. All inter-atomic distances increase in the order Na",

keywords = "Cuprates, EXAFS, Perovskites, Rietveld structure refinements, Ruthenates",

author = "Ebbinghaus, {S. G.} and A. Weidenkaff and Cava, {R. J.}",

note = "Funding Information: Financial support by the Deutsche Forschungsgemeinschaft (SFB 484) is deeply acknowledged. Additionally, S.G.E. thanks the Deutsche Forschungsmeinschaft for a Postdoc-scholarship (Eb219-1). Thanks are due to HASYLAB for allocating beamtime and to the beamline scientists for their help.",

year = "2002",

month = aug,

doi = "10.1006/jssc.2002.9634",

language = "English (US)",

volume = "167",

pages = "126--136",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

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T1 - Structural investigations of ACu3Ru4O12 (A=Na, Ca, Sr, La, Nd) - A comparison between XRD-Rietveld and EXAFS results

AU - Ebbinghaus, S. G.

AU - Weidenkaff, A.

AU - Cava, R. J.

N1 - Funding Information: Financial support by the Deutsche Forschungsgemeinschaft (SFB 484) is deeply acknowledged. Additionally, S.G.E. thanks the Deutsche Forschungsmeinschaft for a Postdoc-scholarship (Eb219-1). Thanks are due to HASYLAB for allocating beamtime and to the beamline scientists for their help.

PY - 2002/8

Y1 - 2002/8

N2 - The structures of five perovskite-related oxides with the general composition ACu3Ru4O12 with A = Na, Ca, Sr, La and Nd, have been examined both by XRD-Rietveld refinements and Ru-K EXAFS-spectroscopy. In addition, the behavior on reduction was investigated by thermogravimetry (TG). The TG measurements revealed that the composition was almost exactly A1Cu3Ru4O12 for all samples. The inter-atomic distances derived from EXAFS- and XRD-Rietveld fits show an excellent agreement with differences smaller than 8 mÅ even for R > 5 Å. All inter-atomic distances increase in the order Na

AB - The structures of five perovskite-related oxides with the general composition ACu3Ru4O12 with A = Na, Ca, Sr, La and Nd, have been examined both by XRD-Rietveld refinements and Ru-K EXAFS-spectroscopy. In addition, the behavior on reduction was investigated by thermogravimetry (TG). The TG measurements revealed that the composition was almost exactly A1Cu3Ru4O12 for all samples. The inter-atomic distances derived from EXAFS- and XRD-Rietveld fits show an excellent agreement with differences smaller than 8 mÅ even for R > 5 Å. All inter-atomic distances increase in the order Na

KW - Cuprates

KW - EXAFS

KW - Perovskites

KW - Rietveld structure refinements

KW - Ruthenates

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