Abstract
X-ray diffraction data are presented for combustion products in the Al-W-N system. New, nonequilibrium intermetallic compounds have been identified, their diffraction patterns have been indexed, and their unit-cell parameters have been determined. The phases α-and β-WAl4 are shown to exist in three isomorphous forms, differing in unit-cell centering. The phases α′-, α″-, and α‴-WAl4 are monoclinic, with a 0 = 5.272 Å, b 0 = 17.770 Å, c 0 = 5.218 Å, β = 100.10°; point groups C12/c1, A12/n1, I12/a1, respectively. The phases β′-, β″-, and β‴-WAl4 are monoclinic, with a 0 = 5.465 Å, b 0 = 12.814 Å, c 0 = 5.428 Å, β = 105.92°; point groups A112/m, B112/m, I112/m, respectively. The compounds WAl2 and W3Al7, identified each in two isomorphous forms, differ in cell metrics (doubling) but possess the same point group: P222. WAl ′2 : orthorhombic, a 0 = 5.793 Å, b 0 = 3.740 Å, c 0 = 6.852 Å. WAl ″2 : orthorhombic, a 0 = 11.586 Å, b 0 = 3.740 Å, c 0 = 6.852 Å. W3Al ′7 : orthorhombic, Pmm2, a 0 = 6.225 Å, b 0 = 4.806 Å, c 0 = 4.437 Å. W3Al ″7 : orthorhombic, Pmm2, a 0 = 12.500 Å, b 0 = 4.806 Å, c 0 = 8.874 Å. The new phase WAl3: triclinic, P1, a 0 = 8.642 Å, b 0 = 10.872 Å, c 0 = 5.478 Å, α = 104.02°, β = 64.90°, γ = 107.15°.
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Original Russian Text © L.G. Raskolenko, A.Yu. Gerul’skii, 2008, published in Neorganicheskie Materialy, 2008, Vol. 44, No. 1, pp. 35–43.
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Raskolenko, L.G., Gerul’skii, A.Y. Compounds WAl4, WAl3, W3Al7, and WAl2 and Al-W-N combustion products. Inorg Mater 44, 30–39 (2008). https://doi.org/10.1134/S0020168508010056
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DOI: https://doi.org/10.1134/S0020168508010056