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. 2020 Apr 8;10:6081. doi: 10.1038/s41598-020-63012-9

Figure 2.

Figure 2

Atomic structure of various carbides. (a) Unit cell of one ω′-Fe6C variant with one C atom at (0 0 0.5). (b) New θ′ variant (θ′-Fe12C2 or θ′-Fe6C) formed by merging the ω′-Fe6C variant with one C atom at (0.5 0 0) (Fig. 1(d)) and the ω′-Fe6C variant with one C atom at (0 0 0.5) in (a) along b axis. (c) New θ′ (θ′-Fe12C3 or θ′-Fe4C) variant. (d) New θ′ variant of θ′-Fe12C4 or θ′-Fe3C formed by doubling the ω′-Fe6C2 in Fig. 1(f) along b axis. All θ′ have an orthorhombic unit cell with lattice parameters of aθ′ = 4.033 Å, bθ′ = 2 × 2.47 Å = 4.94 Å, and cθ′ = 6.986 Å for aα-Fe = 2.852 Å).