Materials Data on Sr(Ni2B)6 by Materials Project
SrNi12B6 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Sr2+ is bonded in a hexagonal planar geometry to six equivalent B3- atoms. All Sr–B bond lengths are 3.19 Å. There are two inequivalent Ni+1.33+ sites. In the first Ni+1.33+ site, Ni+1.33+ is bonded to four equivalent B3- atoms to form a mixture of distorted corner and edge-sharing NiB4 tetrahedra. There are two shorter (2.04 Å) and two longer (2.11 Å) Ni–B bond lengths. In the second Ni+1.33+ site, Ni+1.33+ is bonded in a T-shaped geometry to three equivalent B3- atoms. There are two shorter (2.06 Å) and one longer (2.08 Å) Ni–B bond lengths. B3- is bonded in a 7-coordinate geometry to one Sr2+ and seven Ni+1.33+ atoms.
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