Synthesis, structure, and properties of LaSrCuGaO5

J. T. Vaughey, J. B. Wiley, K. R. Poeppelmeier*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The new brownmillerite‐related compound, LaSrCuGaO5, has been synthesized and characterized. It crystallizes in the orthorhombic non‐centrosymmetric space group Ima2. The unit cell dimensions are a = 16.383(1) Å, b = 5.5293(7) Å, c = 5.3275(6) Å. The structure is related to perovskite but contains ordered oxygen vacancies within the two‐dimensional gallium oxygen layers resulting in tetrahedral coordination of the gallium cations. Other important structural features include buckled copper‐oxygen planes, and disorder of the lanthanum and strontium cations over the A‐site. Accurate lattice constant measurements reveal an a‐axis expansion of 0.17 Å when doped with strontium La1–xSr1+xCuGaO5 (xmax = 0.13). Magnetic susceptibility measurements demonstrate that the compound remains paramagnetic to 4 K.

Original languageEnglish (US)
Pages (from-to)327-338
Number of pages12
JournalZAAC ‐ Journal of Inorganic and General Chemistry
Volume598
Issue number1
DOIs
StatePublished - 1991

Keywords

  • Lanthanum strontium copper gallate
  • crystal structure
  • electrical resistivity
  • magnetic susceptibility
  • preparation

ASJC Scopus subject areas

  • Inorganic Chemistry

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