WOs3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. W(1) is bonded to twelve equivalent Os(1) atoms to form WOs12 cuboctahedra that share corners with six equivalent W(1)Os12 cuboctahedra, corners with twelve equivalent Os(1)Os8W4 cuboctahedra, edges with eighteen equivalent Os(1)Os8W4 cuboctahedra, faces with eight equivalent W(1)Os12 cuboctahedra, and faces with twelve equivalent Os(1)Os8W4 cuboctahedra. Os(1) is bonded to four equivalent W(1) and eight equivalent Os(1) atoms to form OsOs8W4 cuboctahedra that share corners with four equivalent W(1)Os12 cuboctahedra, corners with fourteen equivalent Os(1)Os8W4 cuboctahedra, edges with six equivalent W(1)Os12 cuboctahedra, edges with twelve equivalent Os(1)Os8W4 cuboctahedra, faces with four equivalent W(1)Os12 cuboctahedra, and faces with sixteen equivalent Os(1)Os8W4 cuboctahedra.
WOs3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. W(1) is bonded to twelve equivalent Os(1) atoms to form WOs12 cuboctahedra that share corners with six equivalent W(1)Os12 cuboctahedra, corners with twelve equivalent Os(1)Os8W4 cuboctahedra, edges with eighteen equivalent Os(1)Os8W4 cuboctahedra, faces with eight equivalent W(1)Os12 cuboctahedra, and faces with twelve equivalent Os(1)Os8W4 cuboctahedra. There are six shorter (2.72 Å) and six longer (2.76 Å) W(1)-Os(1) bond lengths. Os(1) is bonded to four equivalent W(1) and eight equivalent Os(1) atoms to form OsOs8W4 cuboctahedra that share corners with four equivalent W(1)Os12 cuboctahedra, corners with fourteen equivalent Os(1)Os8W4 cuboctahedra, edges with six equivalent W(1)Os12 cuboctahedra, edges with twelve equivalent Os(1)Os8W4 cuboctahedra, faces with four equivalent W(1)Os12 cuboctahedra, and faces with sixteen equivalent Os(1)Os8W4 cuboctahedra. There are a spread of Os(1)-Os(1) bond distances ranging from 2.72-2.77 Å.