SrCa3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sr(1) is bonded to twelve Ca(1,1) atoms to form SrCa12 cuboctahedra that share corners with six equivalent Sr(1)Ca12 cuboctahedra; corners with twelve equivalent Ca(1)Sr4Ca8 cuboctahedra; edges with eighteen Ca(1,1)Sr4Ca8 cuboctahedra; faces with eight equivalent Sr(1)Ca12 cuboctahedra; and faces with twelve Ca(1,1)Sr4Ca8 cuboctahedra. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to four equivalent Sr(1) and eight equivalent Ca(1) atoms to form CaSr4Ca8 cuboctahedra that share corners with four equivalent Sr(1)Ca12 cuboctahedra; corners with fourteen Ca(1,1)Sr4Ca8 cuboctahedra; edges with six equivalent Sr(1)Ca12 cuboctahedra; edges with twelve equivalent Ca(1)Sr4Ca8 cuboctahedra; faces with four equivalent Sr(1)Ca12 cuboctahedra; and faces with sixteen Ca(1,1)Sr4Ca8 cuboctahedra. In the second Ca site, Ca(1) is bonded to four equivalent Sr(1) and eight Ca(1,1) atoms to form CaSr4Ca8 cuboctahedra that share corners with four equivalent Sr(1)Ca12 cuboctahedra; corners with fourteen Ca(1,1)Sr4Ca8 cuboctahedra; edges with six equivalent Sr(1)Ca12 cuboctahedra; edges with twelve Ca(1,1)Sr4Ca8 cuboctahedra; faces with four equivalent Sr(1)Ca12 cuboctahedra; and faces with sixteen Ca(1,1)Sr4Ca8 cuboctahedra.
SrCa3 is Magnesium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. Sr(1) is bonded to twelve Ca(1,1) atoms to form SrCa12 cuboctahedra that share corners with six equivalent Sr(1)Ca12 cuboctahedra; corners with twelve equivalent Ca(1)Sr4Ca8 cuboctahedra; edges with eighteen Ca(1,1)Sr4Ca8 cuboctahedra; faces with eight equivalent Sr(1)Ca12 cuboctahedra; and faces with twelve Ca(1,1)Sr4Ca8 cuboctahedra. There are six shorter (4.04 Å) and six longer (4.06 Å) Sr(1)-Ca(1,1) bond lengths. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to four equivalent Sr(1) and eight equivalent Ca(1) atoms to form CaSr4Ca8 cuboctahedra that share corners with four equivalent Sr(1)Ca12 cuboctahedra; corners with fourteen Ca(1,1)Sr4Ca8 cuboctahedra; edges with six equivalent Sr(1)Ca12 cuboctahedra; edges with twelve equivalent Ca(1)Sr4Ca8 cuboctahedra; faces with four equivalent Sr(1)Ca12 cuboctahedra; and faces with sixteen Ca(1,1)Sr4Ca8 cuboctahedra. There are a spread of Ca(1)-Ca(1) bond distances ranging from 3.99-4.10 Å. In the second Ca site, Ca(1) is bonded to four equivalent Sr(1) and eight Ca(1,1) atoms to form CaSr4Ca8 cuboctahedra that share corners with four equivalent Sr(1)Ca12 cuboctahedra; corners with fourteen Ca(1,1)Sr4Ca8 cuboctahedra; edges with six equivalent Sr(1)Ca12 cuboctahedra; edges with twelve Ca(1,1)Sr4Ca8 cuboctahedra; faces with four equivalent Sr(1)Ca12 cuboctahedra; and faces with sixteen Ca(1,1)Sr4Ca8 cuboctahedra. There are a spread of Ca(1)-Ca(1) bond distances ranging from 3.99-4.10 Å.