High resolution electron microscopy study of Sr2NdNbCu2O8

H. W. Zandbergen, R. J. Cava, J. J. Krajewski, W. F. Peck

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9 Scopus citations


The structure of Sr2NdNbCu2O8 (tetragonal, space group P4bm, a = 0.549, c = 1.166 nm) and crystallographic defects occurring therein have been studied with high resolution electron microscopy and electron diffraction. The structure of Sr2NdNbCu2O8 consists of a layer sequence NdCuO2SrONbO2SrOCuO2 having a perovskite-like structure. This structure is very similar to that of YBa2Cu3O7: Y is replaced by Nd and the CuO layer by a NbO2 layer. Sr2NdNbCu2O8 has an ap√2, ap√2, c superstructure, due to rotation of the NbO6 octahedra about the c-axis, leading to a space group P4bm. This superstructure is often short range. Intergrowths occur with an approximate composition of Sr(Nb, Cu)O3, which adopts a modified simple perovskite structure. Also, examples are shown of [110] 90° rotation twins and edge dislocations.

Original languageEnglish (US)
Pages (from-to)322-330
Number of pages9
JournalJournal of Solid State Chemistry
Issue number2
StatePublished - Jan 1 1992
Externally publishedYes

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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