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- W1979103007 abstract "The crystal structure of ζ-(Mo, Cr)4C3− x was determined from X-ray powder photographs and the phase shown to be isomorphous with ζ-Hf4N13 and the ζ-phases in the Group V metal-carbon systems2. The structure is trigonal, space group D53d-R3̄m, with a rhombohedral unit cell of aR = 9.757 Å, α=17°22' (hexagonal axes: a = 2.982 Å, c = 28.81 Å) at a composition (Mo0.77, Cr0.23)4 C2.50. The unit cell contains 12 close-packed metal layers in stacking sequence (hhcc)3, or ABABCACABCBC. The metal atoms are statistically distributed among point positions 6(c). The carbon atoms are assumed to occupy octahedral interstitial sites in 6(c), 3(a), and 3(b). Possible carbon ordering on 6(c) and 3(a), with point position 3(b) unfilled, could not be determined as a result of the low scattering power of carbon. The ζ-carbide (ideal: 42.86 at.% C) has a carbon defect between 5 and 6 at.% nearly independent of the metal exchange, and decomposes below ~1650°C into η-(Mo, Cr)3C2 solid solution and subcarbide (Mo,Cr)2C. The phase is obtained homogeneous between chromium exchanges of 12 at.% (a = 3.00 Å, c = 28.95 Å) and ~ 54 at.% (a = 2.915 Å, c = 27.92 Å)." @default.
- W1979103007 created "2016-06-24" @default.
- W1979103007 creator A5091746692 @default.
- W1979103007 date "1973-12-01" @default.
- W1979103007 modified "2023-09-24" @default.
- W1979103007 title "A high temperature phase with the ζ-carbide structure in the molybdenum-chromium-carbon system" @default.
- W1979103007 cites W2064267985 @default.
- W1979103007 doi "https://doi.org/10.1016/0022-5088(73)90184-7" @default.
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