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Pm3Ge is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pm is bonded in a distorted square co-planar geometry to four equivalent Ge atoms. All Pm–Ge bond lengths are 3.40 Å. Ge is bonded to twelve equivalent Pm atoms to form a mixture of face and corner-sharing GePm12 cuboctahedra.
PmGe3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pm is bonded to twelve equivalent Ge atoms to form a mixture of corner and face-sharing PmGe12 cuboctahedra. There are six shorter (3.11 Å) and six longer (3.25 Å) Pm–Ge bond lengths. Ge is bonded in a 4-coordinate geometry to four equivalent Pm and six equivalent Ge atoms. There are two shorter (2.73 Å) and four longer (3.01 Å) Ge–Ge bond lengths.