Sr3Cr is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent Sr(1), four equivalent Sr(2), and four equivalent Cr(1) atoms to form distorted SrSr8Cr4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Cr4 cuboctahedra, edges with eight equivalent Sr(1)Sr8Cr4 cuboctahedra, edges with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Sr12 cuboctahedra, faces with four equivalent Sr(2)Sr8Cr4 cuboctahedra, faces with four equivalent Cr(1)Sr12 cuboctahedra, and faces with ten equivalent Sr(1)Sr8Cr4 cuboctahedra. In the second Sr site, Sr(2) is bonded to eight equivalent Sr(1) and four equivalent Cr(1) atoms to form distorted SrSr8Cr4 cuboctahedra that share corners with four equivalent Sr(2)Sr8Cr4 cuboctahedra, corners with eight equivalent Cr(1)Sr12 cuboctahedra, edges with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Cr4 cuboctahedra, faces with four equivalent Sr(2)Sr8Cr4 cuboctahedra, faces with six equivalent Cr(1)Sr12 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Cr4 cuboctahedra. Cr(1) is bonded to four equivalent Sr(2) and eight equivalent Sr(1) atoms to form CrSr12 cuboctahedra that share corners with four equivalent Cr(1)Sr12 cuboctahedra, corners with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Cr4 cuboctahedra, faces with four equivalent Cr(1)Sr12 cuboctahedra, faces with six equivalent Sr(2)Sr8Cr4 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Cr4 cuboctahedra.
Sr3Cr is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to four equivalent Sr(1), four equivalent Sr(2), and four equivalent Cr(1) atoms to form distorted SrSr8Cr4 cuboctahedra that share corners with twelve equivalent Sr(1)Sr8Cr4 cuboctahedra, edges with eight equivalent Sr(1)Sr8Cr4 cuboctahedra, edges with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Sr12 cuboctahedra, faces with four equivalent Sr(2)Sr8Cr4 cuboctahedra, faces with four equivalent Cr(1)Sr12 cuboctahedra, and faces with ten equivalent Sr(1)Sr8Cr4 cuboctahedra. All Sr(1)-Sr(1) bond lengths are 3.93 Å. All Sr(1)-Sr(2) bond lengths are 3.90 Å. All Sr(1)-Cr(1) bond lengths are 3.90 Å. In the second Sr site, Sr(2) is bonded to eight equivalent Sr(1) and four equivalent Cr(1) atoms to form distorted SrSr8Cr4 cuboctahedra that share corners with four equivalent Sr(2)Sr8Cr4 cuboctahedra, corners with eight equivalent Cr(1)Sr12 cuboctahedra, edges with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Cr4 cuboctahedra, faces with four equivalent Sr(2)Sr8Cr4 cuboctahedra, faces with six equivalent Cr(1)Sr12 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Cr4 cuboctahedra. All Sr(2)-Cr(1) bond lengths are 3.93 Å. Cr(1) is bonded to four equivalent Sr(2) and eight equivalent Sr(1) atoms to form CrSr12 cuboctahedra that share corners with four equivalent Cr(1)Sr12 cuboctahedra, corners with eight equivalent Sr(2)Sr8Cr4 cuboctahedra, edges with eight equivalent Cr(1)Sr12 cuboctahedra, edges with sixteen equivalent Sr(1)Sr8Cr4 cuboctahedra, faces with four equivalent Cr(1)Sr12 cuboctahedra, faces with six equivalent Sr(2)Sr8Cr4 cuboctahedra, and faces with eight equivalent Sr(1)Sr8Cr4 cuboctahedra.