Ba2US6 crystallizes in the tetragonal P4_2/nmc space group. Ba(1) is bonded in a 10-coordinate geometry to four equivalent S(2) and six equivalent S(1) atoms. U(1) is bonded to four equivalent S(1) and four equivalent S(2) atoms to form distorted US8 hexagonal bipyramids that share corners with four equivalent U(1)S8 hexagonal bipyramids and corners with four equivalent S(1)Ba3US trigonal bipyramids. There are two inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Ba(1), one U(1), and one S(1) atom to form distorted SBa3US trigonal bipyramids that share  a cornercorner with one U(1)S8 hexagonal bipyramid, corners with ten equivalent S(1)Ba3US trigonal bipyramids, and edges with four equivalent S(1)Ba3US trigonal bipyramids. In the second S site, S(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1) and two equivalent U(1) atoms.
Ba2US6 crystallizes in the tetragonal P4_2/nmc space group. Ba(1) is bonded in a 10-coordinate geometry to four equivalent S(2) and six equivalent S(1) atoms. There are two shorter (3.27 Å) and two longer (3.70 Å) Ba(1)-S(2) bond lengths. There are four shorter (3.26 Å) and two longer (3.36 Å) Ba(1)-S(1) bond lengths. U(1) is bonded to four equivalent S(1) and four equivalent S(2) atoms to form distorted US8 hexagonal bipyramids that share corners with four equivalent U(1)S8 hexagonal bipyramids and corners with four equivalent S(1)Ba3US trigonal bipyramids. All U(1)-S(1) bond lengths are 2.83 Å. All U(1)-S(2) bond lengths are 2.76 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded to three equivalent Ba(1), one U(1), and one S(1) atom to form distorted SBa3US trigonal bipyramids that share  a cornercorner with one U(1)S8 hexagonal bipyramid, corners with ten equivalent S(1)Ba3US trigonal bipyramids, and edges with four equivalent S(1)Ba3US trigonal bipyramids. The S(1)-S(1) bond length is 2.07 Å. In the second S site, S(2) is bonded in a 6-coordinate geometry to four equivalent Ba(1) and two equivalent U(1) atoms.