Cr3Se is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to four equivalent Cr(1), four equivalent Cr(2), and four equivalent Se(1) atoms to form distorted CrCr8Se4 cuboctahedra that share corners with twelve equivalent Cr(1)Cr8Se4 cuboctahedra, edges with eight equivalent Cr(1)Cr8Se4 cuboctahedra, edges with eight equivalent Se(1)Cr12 cuboctahedra, faces with four equivalent Se(1)Cr12 cuboctahedra, and faces with ten equivalent Cr(1)Cr8Se4 cuboctahedra. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to eight equivalent Cr(1) and four equivalent Se(1) atoms. Se(1) is bonded to four equivalent Cr(2) and eight equivalent Cr(1) atoms to form SeCr12 cuboctahedra that share corners with four equivalent Se(1)Cr12 cuboctahedra, edges with eight equivalent Se(1)Cr12 cuboctahedra, edges with sixteen equivalent Cr(1)Cr8Se4 cuboctahedra, faces with four equivalent Se(1)Cr12 cuboctahedra, and faces with eight equivalent Cr(1)Cr8Se4 cuboctahedra.
Cr3Se is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to four equivalent Cr(1), four equivalent Cr(2), and four equivalent Se(1) atoms to form distorted CrCr8Se4 cuboctahedra that share corners with twelve equivalent Cr(1)Cr8Se4 cuboctahedra, edges with eight equivalent Cr(1)Cr8Se4 cuboctahedra, edges with eight equivalent Se(1)Cr12 cuboctahedra, faces with four equivalent Se(1)Cr12 cuboctahedra, and faces with ten equivalent Cr(1)Cr8Se4 cuboctahedra. All Cr(1)-Cr(1) bond lengths are 2.46 Å. All Cr(1)-Cr(2) bond lengths are 2.69 Å. All Cr(1)-Se(1) bond lengths are 2.69 Å. In the second Cr site, Cr(2) is bonded in a square co-planar geometry to eight equivalent Cr(1) and four equivalent Se(1) atoms. All Cr(2)-Se(1) bond lengths are 2.46 Å. Se(1) is bonded to four equivalent Cr(2) and eight equivalent Cr(1) atoms to form SeCr12 cuboctahedra that share corners with four equivalent Se(1)Cr12 cuboctahedra, edges with eight equivalent Se(1)Cr12 cuboctahedra, edges with sixteen equivalent Cr(1)Cr8Se4 cuboctahedra, faces with four equivalent Se(1)Cr12 cuboctahedra, and faces with eight equivalent Cr(1)Cr8Se4 cuboctahedra.