Materials Data on FeHg3 by Materials Project
FeHg3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Fe is bonded to twelve equivalent Hg atoms to form a mixture of face and corner-sharing FeHg12 cuboctahedra. There are six shorter (2.91 Å) and six longer (3.22 Å) Fe–Hg bond lengths. Hg is bonded in a 2-coordinate geometry to four equivalent Fe and six equivalent Hg atoms. There are four shorter (3.01 Å) and two longer (3.07 Å) Hg–Hg bond lengths.
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