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

Xiuni Wu, Susan Latturner, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

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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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Cobalt
Aluminum
Intermetallics
intermetallics
cobalt
aluminum
Silicides
Crystals
silicides
oxidation resistance
Oxidation resistance
Liquids
liquids
Lattice constants
crystals
Transition metals
lattice parameters
transition metals
Single crystals
X ray diffraction

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Structurally complex cobalt intermetallics grown from liquid aluminum : Co19Al45Si10-x (x = 0.13) and Co 5Al14Si2. / Wu, Xiuni; Latturner, Susan; Kanatzidis, Mercouri G.

In: Inorganic Chemistry, Vol. 45, No. 14, 10.07.2006, p. 5358-5366.

Research output: Contribution to journalArticle

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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) {\AA}, b = 19.143(2) {\AA}, c = 12.8137(15) {\AA}, β = 123.583(2)°. Co5Al14Si2 adopts the orthorhombic space group Pnma with cell parameters a = 13.8948(19) {\AA}, b = 23.039(3) {\AA}, c = 7.3397(10) {\AA}. 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.",
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N2 - 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.

AB - 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.

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