Rb2Ba8Ca(Sb3O)2 crystallizes in the orthorhombic Fmm2 space group. Rb(1) is bonded in a 3-coordinate geometry to one Sb(2), one Sb(3), and two equivalent Sb(1) atoms. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(3), two equivalent Sb(4), and one O(1) atom. In the second Ba site, Ba(2) is bonded in a distorted single-bond geometry to two equivalent Sb(4) and one O(1) atom. In the third Ba site, Ba(3) is bonded in a distorted single-bond geometry to one Sb(2), two equivalent Sb(1), and one O(1) atom. Ca(1) is bonded in a 3-coordinate geometry to one Sb(3) and two equivalent Sb(1) atoms. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Ba(1), two equivalent Ba(3), and one Ca(1) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to two equivalent Rb(1), two equivalent Ba(3), four equivalent Ba(1), and one Sb(3) atom. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to two equivalent Rb(1), four equivalent Ba(1), one Ca(1), and one Sb(2) atom. In the fourth Sb site, Sb(4) is bonded in a 6-coordinate geometry to two equivalent Ba(2) and four equivalent Ba(1) atoms. O(1) is bonded in a tetrahedral geometry to one Ba(2), one Ba(3), and two equivalent Ba(1) atoms.
Rb2Ba8Ca(Sb3O)2 crystallizes in the orthorhombic Fmm2 space group. Rb(1) is bonded in a 3-coordinate geometry to one Sb(2), one Sb(3), and two equivalent Sb(1) atoms. The Rb(1)-Sb(2) bond length is 3.69 Å. The Rb(1)-Sb(3) bond length is 4.01 Å. There is one shorter (3.46 Å) and one longer (3.47 Å) Rb(1)-Sb(1) bond length. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(3), two equivalent Sb(4), and one O(1) atom. The Ba(1)-Sb(1) bond length is 3.62 Å. The Ba(1)-Sb(2) bond length is 3.68 Å. The Ba(1)-Sb(3) bond length is 3.59 Å. There is one shorter (3.77 Å) and one longer (3.96 Å) Ba(1)-Sb(4) bond length. The Ba(1)-O(1) bond length is 2.67 Å. In the second Ba site, Ba(2) is bonded in a distorted single-bond geometry to two equivalent Sb(4) and one O(1) atom. Both Ba(2)-Sb(4) bond lengths are 3.65 Å. The Ba(2)-O(1) bond length is 2.44 Å. In the third Ba site, Ba(3) is bonded in a distorted single-bond geometry to one Sb(2), two equivalent Sb(1), and one O(1) atom. The Ba(3)-Sb(2) bond length is 4.11 Å. Both Ba(3)-Sb(1) bond lengths are 3.53 Å. The Ba(3)-O(1) bond length is 2.56 Å. Ca(1) is bonded in a 3-coordinate geometry to one Sb(3) and two equivalent Sb(1) atoms. The Ca(1)-Sb(3) bond length is 2.98 Å. Both Ca(1)-Sb(1) bond lengths are 2.94 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 7-coordinate geometry to two equivalent Rb(1), two equivalent Ba(1), two equivalent Ba(3), and one Ca(1) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to two equivalent Rb(1), two equivalent Ba(3), four equivalent Ba(1), and one Sb(3) atom. The Sb(2)-Sb(3) bond length is 2.91 Å. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to two equivalent Rb(1), four equivalent Ba(1), one Ca(1), and one Sb(2) atom. In the fourth Sb site, Sb(4) is bonded in a 6-coordinate geometry to two equivalent Ba(2) and four equivalent Ba(1) atoms. O(1) is bonded in a tetrahedral geometry to one Ba(2), one Ba(3), and two equivalent Ba(1) atoms.