Structural diversity in oxygen-deficient perovskites

J. T. Vaughey, Kenneth R Poeppelmeier

Research output: Chapter in Book/Report/Conference proceedingChapter

14 Citations (Scopus)


The discovery of high temperature superconductivity in several perovskite-related copper oxides which exhibit variable oxygen stoichiometry has initiated renewed interest in the structures of oxygen deficient perovskites and related compounds. For example, it has been suggested that in the YBa2Cu3O7-δ system, the reported plateau in the plot of oxygen content versus Tc at 60K is due to an ordering of the oxygen vacancies. Therefore the determination of possible structures originating from the removal of oxygen and ordering of the anion vacancies is essential. There are several known perovskite-related oxides where the ordering of vacancies have been well determined by either X-ray single crystal or neutron powder diffraction structure determinations. In this paper, we will compare the structures of LaSrCuAlO5, Ca2Mn2O5, LaSrCuGaO5, and YBaCuFeO5. These examples demonstrate that compounds which exhibit a large fraction (≈ 17%) of anion vacancies adopt nonrandom vacancy distributions that reflect the coordination chemistry of the B-cation(s). Each exhibits a unique way to remove one oxygen from a double perovskite (A2B2O6). The synthesis and X-ray single crystal structure for YBaCuFeO5 are reported and compared with an earlier neutron powder diffraction study.

Original languageEnglish
Title of host publicationNIST Special Publication
Number of pages8
Publication statusPublished - Jan 1991
EventProceedings of the International Conference on the Chemistry of Electronic Ceramic Materials - Jackson, WY, USA
Duration: Aug 17 1990Aug 22 1990


OtherProceedings of the International Conference on the Chemistry of Electronic Ceramic Materials
CityJackson, WY, USA

ASJC Scopus subject areas

  • Engineering(all)

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    Vaughey, J. T., & Poeppelmeier, K. R. (1991). Structural diversity in oxygen-deficient perovskites. In NIST Special Publication (804 ed., pp. 419-426)