Materials Data on TmB12 by Materials Project
TmB12 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Tm is bonded in a 1-coordinate geometry to twenty-four equivalent B atoms. All Tm–B bond lengths are 2.78 Å. B is bonded in a 7-coordinate geometry to two equivalent Tm and five equivalent B atoms. There is one shorter (1.71 Å) and four longer (1.79 Å) B–B bond length.
36 MATERIALS SCIENCE↗