Eu3W is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 4-coordinate geometry to four equivalent Eu(2) and four equivalent W(1) atoms. In the second Eu site, Eu(2) is bonded to eight equivalent Eu(1) and four equivalent W(1) atoms to form EuEu8W4 cuboctahedra that share corners with four equivalent Eu(2)Eu8W4 cuboctahedra, corners with eight equivalent W(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Eu8W4 cuboctahedra, faces with four equivalent Eu(2)Eu8W4 cuboctahedra, and faces with six equivalent W(1)Eu12 cuboctahedra. W(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form WEu12 cuboctahedra that share corners with four equivalent W(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Eu8W4 cuboctahedra, edges with eight equivalent W(1)Eu12 cuboctahedra, faces with four equivalent W(1)Eu12 cuboctahedra, and faces with six equivalent Eu(2)Eu8W4 cuboctahedra.
Eu3W is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 4-coordinate geometry to four equivalent Eu(2) and four equivalent W(1) atoms. All Eu(1)-Eu(2) bond lengths are 3.40 Å. All Eu(1)-W(1) bond lengths are 3.40 Å. In the second Eu site, Eu(2) is bonded to eight equivalent Eu(1) and four equivalent W(1) atoms to form EuEu8W4 cuboctahedra that share corners with four equivalent Eu(2)Eu8W4 cuboctahedra, corners with eight equivalent W(1)Eu12 cuboctahedra, edges with eight equivalent Eu(2)Eu8W4 cuboctahedra, faces with four equivalent Eu(2)Eu8W4 cuboctahedra, and faces with six equivalent W(1)Eu12 cuboctahedra. All Eu(2)-W(1) bond lengths are 3.57 Å. W(1) is bonded to four equivalent Eu(2) and eight equivalent Eu(1) atoms to form WEu12 cuboctahedra that share corners with four equivalent W(1)Eu12 cuboctahedra, corners with eight equivalent Eu(2)Eu8W4 cuboctahedra, edges with eight equivalent W(1)Eu12 cuboctahedra, faces with four equivalent W(1)Eu12 cuboctahedra, and faces with six equivalent Eu(2)Eu8W4 cuboctahedra.