SrPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Sr(1) is bonded to twelve Pm(1,1) atoms to form SrPm12 cuboctahedra that share corners with six equivalent Sr(1)Pm12 cuboctahedra; corners with twelve equivalent Pm(1)Sr4Pm8 cuboctahedra; edges with eighteen Pm(1,1)Sr4Pm8 cuboctahedra; faces with eight equivalent Sr(1)Pm12 cuboctahedra; and faces with twelve Pm(1,1)Sr4Pm8 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Sr(1) and eight Pm(1,1) atoms to form distorted PmSr4Pm8 cuboctahedra that share corners with four equivalent Sr(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Sr4Pm8 cuboctahedra; edges with six equivalent Sr(1)Pm12 cuboctahedra; edges with twelve Pm(1,1)Sr4Pm8 cuboctahedra; faces with four equivalent Sr(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Sr4Pm8 cuboctahedra. In the second Pm site, Pm(1) is bonded to four equivalent Sr(1) and eight equivalent Pm(1) atoms to form distorted PmSr4Pm8 cuboctahedra that share corners with four equivalent Sr(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Sr4Pm8 cuboctahedra; edges with six equivalent Sr(1)Pm12 cuboctahedra; edges with twelve equivalent Pm(1)Sr4Pm8 cuboctahedra; faces with four equivalent Sr(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Sr4Pm8 cuboctahedra.
SrPm3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Sr(1) is bonded to twelve Pm(1,1) atoms to form SrPm12 cuboctahedra that share corners with six equivalent Sr(1)Pm12 cuboctahedra; corners with twelve equivalent Pm(1)Sr4Pm8 cuboctahedra; edges with eighteen Pm(1,1)Sr4Pm8 cuboctahedra; faces with eight equivalent Sr(1)Pm12 cuboctahedra; and faces with twelve Pm(1,1)Sr4Pm8 cuboctahedra. There are six shorter (3.78 Å) and six longer (3.81 Å) Sr(1)-Pm(1,1) bond lengths. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Sr(1) and eight Pm(1,1) atoms to form distorted PmSr4Pm8 cuboctahedra that share corners with four equivalent Sr(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Sr4Pm8 cuboctahedra; edges with six equivalent Sr(1)Pm12 cuboctahedra; edges with twelve Pm(1,1)Sr4Pm8 cuboctahedra; faces with four equivalent Sr(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Sr4Pm8 cuboctahedra. There are a spread of Pm(1)-Pm(1,1) bond distances ranging from 3.65-3.96 Å. In the second Pm site, Pm(1) is bonded to four equivalent Sr(1) and eight equivalent Pm(1) atoms to form distorted PmSr4Pm8 cuboctahedra that share corners with four equivalent Sr(1)Pm12 cuboctahedra; corners with fourteen Pm(1,1)Sr4Pm8 cuboctahedra; edges with six equivalent Sr(1)Pm12 cuboctahedra; edges with twelve equivalent Pm(1)Sr4Pm8 cuboctahedra; faces with four equivalent Sr(1)Pm12 cuboctahedra; and faces with sixteen Pm(1,1)Sr4Pm8 cuboctahedra.