Compounds WAl4, WAl3, W3Al7, and WAl2 and Al-W-N combustion products |
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Authors: | L. G. Raskolenko A. Yu. Gerul’skii |
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Affiliation: | (1) Department of Structural Macrokinetics, Tomsk Scientific Center, Siberian Division, Russian Academy of Sciences, Akademicheskii pr. 10/3, Tomsk, 634051, Russia |
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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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