Structurally complex cobalt intermetallics grown from liquid aluminum: Co19Al45Si10-x (x = 0.13) and Co 5Al14Si2

Xiuni Wu, Susan Latturner, Mercouri G. Kanatzidis

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Abstract

The cobalt aluminum silicides Co19Al45Si 10-x (x = 0.13) and Co5Al14Si2 were synthesized in liquid aluminum and characterized by single-crystal X-ray diffraction. Co19Al45Si10-x (x = 0.13) crystallizes in the monoclinic space group C2/c with lattice parameters a = 19.991(2) Å, b = 19.143(2) Å, c = 12.8137(15) Å, β = 123.583(2)°. Co5Al14Si2 adopts the orthorhombic space group Pnma with cell parameters a = 13.8948(19) Å, b = 23.039(3) Å, c = 7.3397(10) Å. Both structures are exceptionally complex with the Co2Si2 rhombus being a common building motif. The coordination environments of cobalt atoms resemble those of the transition metals in typical quasi-crystal approximants. Co5Al 14Si2 shows oxidation resistance in air up to 1000°C by forming a dense-packed Al2O3 layer on the surface of the crystal.

Original languageEnglish
Pages (from-to)5358-5366
Number of pages9
JournalInorganic Chemistry
Volume45
Issue number14
DOIs
Publication statusPublished - Jul 10 2006

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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