Li3B2SbO6 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Li(2)O5 trigonal bipyramid, corners with three equivalent Sb(1)O5 trigonal bipyramids, corners with two equivalent Li(3)O4 trigonal pyramids, and  an edgeedge with one Li(2)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form LiO5 trigonal bipyramids that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 trigonal pyramids,  an edgeedge with one Li(1)O4 tetrahedra, edges with two equivalent Sb(1)O5 trigonal bipyramids, and  an edgeedge with one Li(3)O4 trigonal pyramid. In the third Li site, Li(3) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O5 trigonal bipyramids, corners with two equivalent Sb(1)O5 trigonal bipyramids,  an edgeedge with one Li(2)O5 trigonal bipyramid, and  an edgeedge with one Li(3)O4 trigonal pyramid. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. Sb(1) is bonded to one O(1), one O(2), one O(4), one O(5), and one O(6) atom to form SbO5 trigonal bipyramids that share corners with three equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 trigonal pyramids, and edges with two equivalent Li(2)O5 trigonal bipyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one B(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Li(3), one B(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), two equivalent Li(3), and one B(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one B(2), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a distorted tetrahedral geometry to one Li(2), one Li(3), one B(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one B(1), and one Sb(1) atom.
Li3B2SbO6 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Li(2)O5 trigonal bipyramid, corners with three equivalent Sb(1)O5 trigonal bipyramids, corners with two equivalent Li(3)O4 trigonal pyramids, and  an edgeedge with one Li(2)O5 trigonal bipyramid. The Li(1)-O(1) bond length is 2.05 Å. The Li(1)-O(3) bond length is 2.18 Å. The Li(1)-O(4) bond length is 1.90 Å. The Li(1)-O(6) bond length is 1.94 Å. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), one O(5), and one O(6) atom to form LiO5 trigonal bipyramids that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 trigonal pyramids,  an edgeedge with one Li(1)O4 tetrahedra, edges with two equivalent Sb(1)O5 trigonal bipyramids, and  an edgeedge with one Li(3)O4 trigonal pyramid. The Li(2)-O(1) bond length is 2.07 Å. The Li(2)-O(2) bond length is 2.16 Å. The Li(2)-O(3) bond length is 2.10 Å. The Li(2)-O(5) bond length is 2.16 Å. The Li(2)-O(6) bond length is 2.50 Å. In the third Li site, Li(3) is bonded to one O(2), one O(5), and two equivalent O(3) atoms to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O5 trigonal bipyramids, corners with two equivalent Sb(1)O5 trigonal bipyramids,  an edgeedge with one Li(2)O5 trigonal bipyramid, and  an edgeedge with one Li(3)O4 trigonal pyramid. The Li(3)-O(2) bond length is 1.93 Å. The Li(3)-O(5) bond length is 1.91 Å. There is one shorter (1.94 Å) and one longer (2.35 Å) Li(3)-O(3) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(6) atom. The B(1)-O(2) bond length is 1.40 Å. The B(1)-O(3) bond length is 1.39 Å. The B(1)-O(6) bond length is 1.40 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(5) atom. The B(2)-O(1) bond length is 1.39 Å. The B(2)-O(4) bond length is 1.39 Å. The B(2)-O(5) bond length is 1.41 Å. Sb(1) is bonded to one O(1), one O(2), one O(4), one O(5), and one O(6) atom to form SbO5 trigonal bipyramids that share corners with three equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 trigonal pyramids, and edges with two equivalent Li(2)O5 trigonal bipyramids. The Sb(1)-O(1) bond length is 2.43 Å. The Sb(1)-O(2) bond length is 2.24 Å. The Sb(1)-O(4) bond length is 2.14 Å. The Sb(1)-O(5) bond length is 2.27 Å. The Sb(1)-O(6) bond length is 2.33 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one B(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Li(3), one B(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), two equivalent Li(3), and one B(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one B(2), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a distorted tetrahedral geometry to one Li(2), one Li(3), one B(2), and one Sb(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one B(1), and one Sb(1) atom.