BeLaOs2 crystallizes in the cubic F-43m space group. Be(1) is bonded in a body-centered cubic geometry to four equivalent La(1) and four equivalent Os(2) atoms. La(1) is bonded in a distorted body-centered cubic geometry to four equivalent Be(1), four equivalent Os(1), and six equivalent Os(2) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to four equivalent La(1) and four equivalent Os(2) atoms to form distorted OsLa4Os4 tetrahedra that share corners with twelve equivalent Os(2)La6Be4Os4 tetrahedra, edges with twelve equivalent Os(1)La4Os4 tetrahedra, and faces with four equivalent Os(2)La6Be4Os4 tetrahedra. In the second Os site, Os(2) is bonded to four equivalent Be(1), six equivalent La(1), and four equivalent Os(1) atoms to form distorted OsLa6Be4Os4 tetrahedra that share corners with six equivalent Os(2)La6Be4Os4 tetrahedra, corners with twelve equivalent Os(1)La4Os4 tetrahedra, faces with four equivalent Os(1)La4Os4 tetrahedra, and faces with twelve equivalent Os(2)La6Be4Os4 tetrahedra.
BeLaOs2 crystallizes in the cubic F-43m space group. Be(1) is bonded in a body-centered cubic geometry to four equivalent La(1) and four equivalent Os(2) atoms. All Be(1)-La(1) bond lengths are 2.82 Å. All Be(1)-Os(2) bond lengths are 2.82 Å. La(1) is bonded in a distorted body-centered cubic geometry to four equivalent Be(1), four equivalent Os(1), and six equivalent Os(2) atoms. All La(1)-Os(1) bond lengths are 2.82 Å. All La(1)-Os(2) bond lengths are 3.25 Å. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to four equivalent La(1) and four equivalent Os(2) atoms to form distorted OsLa4Os4 tetrahedra that share corners with twelve equivalent Os(2)La6Be4Os4 tetrahedra, edges with twelve equivalent Os(1)La4Os4 tetrahedra, and faces with four equivalent Os(2)La6Be4Os4 tetrahedra. All Os(1)-Os(2) bond lengths are 2.82 Å. In the second Os site, Os(2) is bonded to four equivalent Be(1), six equivalent La(1), and four equivalent Os(1) atoms to form distorted OsLa6Be4Os4 tetrahedra that share corners with six equivalent Os(2)La6Be4Os4 tetrahedra, corners with twelve equivalent Os(1)La4Os4 tetrahedra, faces with four equivalent Os(1)La4Os4 tetrahedra, and faces with twelve equivalent Os(2)La6Be4Os4 tetrahedra.