BeAl3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Be(1) is bonded to four equivalent Al(2) and eight equivalent Al(1) atoms to form BeAl12 cuboctahedra that share corners with four equivalent Be(1)Al12 cuboctahedra, corners with eight equivalent Al(2)Be4Al8 cuboctahedra, edges with eight equivalent Be(1)Al12 cuboctahedra, edges with sixteen equivalent Al(1)Be4Al8 cuboctahedra, faces with four equivalent Be(1)Al12 cuboctahedra, faces with six equivalent Al(2)Be4Al8 cuboctahedra, and faces with eight equivalent Al(1)Be4Al8 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Be(1), four equivalent Al(1), and four equivalent Al(2) atoms to form AlBe4Al8 cuboctahedra that share corners with twelve equivalent Al(1)Be4Al8 cuboctahedra, edges with eight equivalent Be(1)Al12 cuboctahedra, edges with eight equivalent Al(1)Be4Al8 cuboctahedra, edges with eight equivalent Al(2)Be4Al8 cuboctahedra, faces with four equivalent Be(1)Al12 cuboctahedra, faces with four equivalent Al(2)Be4Al8 cuboctahedra, and faces with ten equivalent Al(1)Be4Al8 cuboctahedra. In the second Al site, Al(2) is bonded to four equivalent Be(1) and eight equivalent Al(1) atoms to form AlBe4Al8 cuboctahedra that share corners with four equivalent Al(2)Be4Al8 cuboctahedra, corners with eight equivalent Be(1)Al12 cuboctahedra, edges with eight equivalent Al(2)Be4Al8 cuboctahedra, edges with sixteen equivalent Al(1)Be4Al8 cuboctahedra, faces with four equivalent Al(2)Be4Al8 cuboctahedra, faces with six equivalent Be(1)Al12 cuboctahedra, and faces with eight equivalent Al(1)Be4Al8 cuboctahedra.
BeAl3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Be(1) is bonded to four equivalent Al(2) and eight equivalent Al(1) atoms to form BeAl12 cuboctahedra that share corners with four equivalent Be(1)Al12 cuboctahedra, corners with eight equivalent Al(2)Be4Al8 cuboctahedra, edges with eight equivalent Be(1)Al12 cuboctahedra, edges with sixteen equivalent Al(1)Be4Al8 cuboctahedra, faces with four equivalent Be(1)Al12 cuboctahedra, faces with six equivalent Al(2)Be4Al8 cuboctahedra, and faces with eight equivalent Al(1)Be4Al8 cuboctahedra. All Be(1)-Al(2) bond lengths are 2.75 Å. All Be(1)-Al(1) bond lengths are 2.74 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Be(1), four equivalent Al(1), and four equivalent Al(2) atoms to form AlBe4Al8 cuboctahedra that share corners with twelve equivalent Al(1)Be4Al8 cuboctahedra, edges with eight equivalent Be(1)Al12 cuboctahedra, edges with eight equivalent Al(1)Be4Al8 cuboctahedra, edges with eight equivalent Al(2)Be4Al8 cuboctahedra, faces with four equivalent Be(1)Al12 cuboctahedra, faces with four equivalent Al(2)Be4Al8 cuboctahedra, and faces with ten equivalent Al(1)Be4Al8 cuboctahedra. All Al(1)-Al(1) bond lengths are 2.75 Å. All Al(1)-Al(2) bond lengths are 2.74 Å. In the second Al site, Al(2) is bonded to four equivalent Be(1) and eight equivalent Al(1) atoms to form AlBe4Al8 cuboctahedra that share corners with four equivalent Al(2)Be4Al8 cuboctahedra, corners with eight equivalent Be(1)Al12 cuboctahedra, edges with eight equivalent Al(2)Be4Al8 cuboctahedra, edges with sixteen equivalent Al(1)Be4Al8 cuboctahedra, faces with four equivalent Al(2)Be4Al8 cuboctahedra, faces with six equivalent Be(1)Al12 cuboctahedra, and faces with eight equivalent Al(1)Be4Al8 cuboctahedra.