SrAc3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Ac(1) and eight equivalent Ac(2) atoms to form SrAc12 cuboctahedra that share corners with four equivalent Sr(1)Ac12 cuboctahedra, corners with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with six equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to four equivalent Sr(1) and eight equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with four equivalent Ac(1)Sr4Ac8 cuboctahedra, corners with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, faces with six equivalent Sr(1)Ac12 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. In the second Ac site, Ac(2) is bonded to four equivalent Sr(1), four equivalent Ac(1), and four equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with twelve equivalent Ac(2)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with ten equivalent Ac(2)Sr4Ac8 cuboctahedra.
SrAc3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent Ac(1) and eight equivalent Ac(2) atoms to form SrAc12 cuboctahedra that share corners with four equivalent Sr(1)Ac12 cuboctahedra, corners with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with six equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. All Sr(1)-Ac(1) bond lengths are 4.06 Å. All Sr(1)-Ac(2) bond lengths are 4.04 Å. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to four equivalent Sr(1) and eight equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with four equivalent Ac(1)Sr4Ac8 cuboctahedra, corners with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with sixteen equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, faces with six equivalent Sr(1)Ac12 cuboctahedra, and faces with eight equivalent Ac(2)Sr4Ac8 cuboctahedra. All Ac(1)-Ac(2) bond lengths are 4.04 Å. In the second Ac site, Ac(2) is bonded to four equivalent Sr(1), four equivalent Ac(1), and four equivalent Ac(2) atoms to form AcSr4Ac8 cuboctahedra that share corners with twelve equivalent Ac(2)Sr4Ac8 cuboctahedra, edges with eight equivalent Sr(1)Ac12 cuboctahedra, edges with eight equivalent Ac(1)Sr4Ac8 cuboctahedra, edges with eight equivalent Ac(2)Sr4Ac8 cuboctahedra, faces with four equivalent Sr(1)Ac12 cuboctahedra, faces with four equivalent Ac(1)Sr4Ac8 cuboctahedra, and faces with ten equivalent Ac(2)Sr4Ac8 cuboctahedra. All Ac(2)-Ac(2) bond lengths are 4.06 Å.