Synthesis, structure, and properties of LaSrCuGaO5

J. T. Vaughey, J. B. Wiley, Kenneth R Poeppelmeier

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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
Pages (from-to)327-338
Number of pages12
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume598
Issue number1
DOIs
Publication statusPublished - 1991

Keywords

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

ASJC Scopus subject areas

  • Inorganic Chemistry

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