A new layered cuprate structure-type, (A1-xA′x)14Cu24O4 1

T. Siegrist, Lynn Schneemeyer, S. A. Sunshine, J. V. Waszczak, R. S. Roth

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Abstract

Phases crystallizing in a new structure-type with general formula (A1-xA′x)14Cu24O4 1 (A = alkaline earth metal, A′ = trivalent metal) and symmetry Cccm with an extended stoichiometry range have been found in studies of the SrYCuO, BaSrBiCuO and CaLaCuO systems. Single crystal X-ray studies on several crystals grown from different alkaline earth/metal oxide-cuprate melts reveal a common orthorhombic F-centered subcell of a=11.3 A ̊, b=13.0 A ̊ and c=3.9 A ̊. Superstructure is observed in crystals, leading to a 7-fold increase of the c-axis and a change in symmetry to space group Cccm. As in Ba2YCu3O7, the Cu atoms are found as CuO planes and linear CuO chains. Due to shear in the planes, half of the CuO squares share edges, producing CuCu zigzag chains, similar to the planes observed in CaCu2O3. In the linear CuO chains, the CuO squares share edges as well, leading to a short CuCu contact of 2.75Å. Experiments on ceramic samples indicate that the oxygen content is fixed and that the samples are semiconducting.

Original languageEnglish
Pages (from-to)1429-1438
Number of pages10
JournalMaterials Research Bulletin
Volume23
Issue number10
DOIs
StatePublished - 1 Jan 1988

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Alkaline Earth Metals
Alkaline earth metals
alkaline earth metals
cuprates
alkaline earth oxides
Crystals
half planes
symmetry
Stoichiometry
Oxides
crystals
metal oxides
stoichiometry
Metals
Single crystals
ceramics
Oxygen
shear
X rays
Atoms

Keywords

  • copper
  • oxides

Cite this

Siegrist, T. ; Schneemeyer, Lynn ; Sunshine, S. A. ; Waszczak, J. V. ; Roth, R. S. / A new layered cuprate structure-type, (A1-xA′x)14Cu24O4 1. In: Materials Research Bulletin. 1988 ; Vol. 23, No. 10. pp. 1429-1438.
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abstract = "Phases crystallizing in a new structure-type with general formula (A1-xA′x)14Cu24O4 1 (A = alkaline earth metal, A′ = trivalent metal) and symmetry Cccm with an extended stoichiometry range have been found in studies of the SrYCuO, BaSrBiCuO and CaLaCuO systems. Single crystal X-ray studies on several crystals grown from different alkaline earth/metal oxide-cuprate melts reveal a common orthorhombic F-centered subcell of a=11.3 A ̊, b=13.0 A ̊ and c=3.9 A ̊. Superstructure is observed in crystals, leading to a 7-fold increase of the c-axis and a change in symmetry to space group Cccm. As in Ba2YCu3O7, the Cu atoms are found as CuO planes and linear CuO chains. Due to shear in the planes, half of the CuO squares share edges, producing CuCu zigzag chains, similar to the planes observed in CaCu2O3. In the linear CuO chains, the CuO squares share edges as well, leading to a short CuCu contact of 2.75{\AA}. Experiments on ceramic samples indicate that the oxygen content is fixed and that the samples are semiconducting.",
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A new layered cuprate structure-type, (A1-xA′x)14Cu24O4 1. / Siegrist, T.; Schneemeyer, Lynn; Sunshine, S. A.; Waszczak, J. V.; Roth, R. S.

In: Materials Research Bulletin, Vol. 23, No. 10, 01.01.1988, p. 1429-1438.

Research output: Contribution to journalArticleResearchpeer-review

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