Umbrella stoichiometry: A guide to the solid state chemistry of copper-rich oxides

D. A. Vander Griend, K. R. Poeppelmeier

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Umbrella stoichiometries are relatively unstable compositions that can be leveraged to promote the formation of unconventional solid state structures. LaIII and CuII in a one to one ratio is such a stoichiometry. The addition of a third metal such as WVI, VV, or RuV generates a complex set of potential products. Nonetheless, La4Cu3MoO12 forms a single phase because no low energy multiphase alternatives exist for a stoichiometry so close to an umbrella stoichiometry. The cations in the structure are severely under-coordinated, yet oxygen can be removed from the structure by substituting CuII for MoVI. La4Cu3+xMo1-xO12-2-x forms a single phase for 0.0 ≤ x ≤ 0.12 before La2Cu2O5 appears. This structurally unfavorable substitution is tolerated because it moves the composition even closer to the umbrella stoichiometry.

Original languageEnglish
Pages (from-to)1277-1282
Number of pages6
JournalInternational Journal of Inorganic Materials
Issue number8
Publication statusPublished - 2001


  • LaCuMoO
  • Umbrella stoichiometry

ASJC Scopus subject areas

  • Materials Chemistry

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