Umbrella stoichiometry: a guide to the solid state chemistry of copper-rich oxides
نویسندگان
چکیده
Umbrella stoichiometries are relatively unstable compositions that can be leveraged to promote the formation of unconventional solid III II VI V V state structures. La and Cu in a one to one ratio is such a stoichiometry. The addition of a third metal such as Mo , V , or Ru generates a complex set of potential products. Nonetheless, La Cu MoO forms a single phase because no low energy multiphase 4 3 12 alternatives exist for a stoichiometry so close to an umbrella stoichiometry. The cations in the structure are severely under-coordinated, II VI yet oxygen can be removed from the structure by substituting Cu for Mo . La Cu Mo O forms a single phase for 4 31x 12x 1222x 0.0 # x # 0.12 before La Cu O appears. This structurally unfavorable substitution is tolerated because it moves the composition even 2 2 5 closer to the umbrella stoichiometry. 2001 Elsevier Science Ltd. All rights reserved.
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