Be2Cr is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to six equivalent Be(2) and six equivalent Cr(1) atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. In the second Be site, Be(2) is bonded to two equivalent Be(1), four equivalent Be(2), and six equivalent Cr(1) atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. Cr(1) is bonded in a 16-coordinate geometry to three equivalent Be(1), nine equivalent Be(2), and four equivalent Cr(1) atoms.
Be2Cr is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to six equivalent Be(2) and six equivalent Cr(1) atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. All Be(1)-Be(2) bond lengths are 2.18 Å. All Be(1)-Cr(1) bond lengths are 2.53 Å. In the second Be site, Be(2) is bonded to two equivalent Be(1), four equivalent Be(2), and six equivalent Cr(1) atoms to form a mixture of edge, face, and corner-sharing BeBe6Cr6 cuboctahedra. There are two shorter (2.13 Å) and two longer (2.18 Å) Be(2)-Be(2) bond lengths. There are four shorter (2.53 Å) and two longer (2.55 Å) Be(2)-Cr(1) bond lengths. Cr(1) is bonded in a 16-coordinate geometry to three equivalent Be(1), nine equivalent Be(2), and four equivalent Cr(1) atoms. There is one shorter (2.64 Å) and three longer (2.65 Å) Cr(1)-Cr(1) bond lengths.