K4Ba2SnSb4 crystallizes in the monoclinic Cc space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one Sn(1), one Sb(1), one Sb(2), one Sb(4), and two equivalent Sb(3) atoms. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Sb(3), one Sb(4), and two equivalent Sb(2) atoms. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sb(3), one Sb(4), and two equivalent Sb(1) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one Sn(1), one Sb(1), one Sb(2), one Sb(4), and two equivalent Sb(3) atoms. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one Sn(1), two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(4) atoms. Sn(1) is bonded in a 7-coordinate geometry to one K(1), one Ba(1), one Ba(2), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(4) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the second Sb site, Sb(1) is bonded in a 8-coordinate geometry to one K(1), one K(4), two equivalent K(3), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the third Sb site, Sb(2) is bonded in a 8-coordinate geometry to one K(1), one K(4), two equivalent K(2), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the fourth Sb site, Sb(3) is bonded in a 8-coordinate geometry to one K(2), one K(3), one K(4), two equivalent K(1), two equivalent Ba(1), and one Sn(1) atom.
K4Ba2SnSb4 crystallizes in the monoclinic Cc space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one Sn(1), one Sb(1), one Sb(2), one Sb(4), and two equivalent Sb(3) atoms. The K(1)-Sn(1) bond length is 3.81 Å. The K(1)-Sb(1) bond length is 3.90 Å. The K(1)-Sb(2) bond length is 3.66 Å. The K(1)-Sb(4) bond length is 3.66 Å. There is one shorter (3.64 Å) and one longer (3.87 Å) K(1)-Sb(3) bond length. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Sb(3), one Sb(4), and two equivalent Sb(2) atoms. The K(2)-Sb(3) bond length is 3.45 Å. The K(2)-Sb(4) bond length is 3.69 Å. There is one shorter (3.47 Å) and one longer (3.60 Å) K(2)-Sb(2) bond length. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sb(3), one Sb(4), and two equivalent Sb(1) atoms. The K(3)-Sb(3) bond length is 3.44 Å. The K(3)-Sb(4) bond length is 3.67 Å. There is one shorter (3.46 Å) and one longer (3.68 Å) K(3)-Sb(1) bond length. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. The K(4)-Sb(1) bond length is 3.54 Å. The K(4)-Sb(2) bond length is 3.54 Å. The K(4)-Sb(3) bond length is 3.62 Å. The K(4)-Sb(4) bond length is 3.73 Å. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one Sn(1), one Sb(1), one Sb(2), one Sb(4), and two equivalent Sb(3) atoms. The Ba(1)-Sn(1) bond length is 3.84 Å. The Ba(1)-Sb(1) bond length is 3.58 Å. The Ba(1)-Sb(2) bond length is 3.78 Å. The Ba(1)-Sb(4) bond length is 3.72 Å. There is one shorter (3.58 Å) and one longer (3.79 Å) Ba(1)-Sb(3) bond length. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one Sn(1), two equivalent Sb(1), two equivalent Sb(2), and two equivalent Sb(4) atoms. The Ba(2)-Sn(1) bond length is 3.82 Å. There is one shorter (3.56 Å) and one longer (3.81 Å) Ba(2)-Sb(1) bond length. There is one shorter (3.57 Å) and one longer (3.77 Å) Ba(2)-Sb(2) bond length. There is one shorter (3.60 Å) and one longer (4.06 Å) Ba(2)-Sb(4) bond length. Sn(1) is bonded in a 7-coordinate geometry to one K(1), one Ba(1), one Ba(2), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. The Sn(1)-Sb(1) bond length is 2.87 Å. The Sn(1)-Sb(2) bond length is 2.88 Å. The Sn(1)-Sb(3) bond length is 2.85 Å. The Sn(1)-Sb(4) bond length is 2.90 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(4) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the second Sb site, Sb(1) is bonded in a 8-coordinate geometry to one K(1), one K(4), two equivalent K(3), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the third Sb site, Sb(2) is bonded in a 8-coordinate geometry to one K(1), one K(4), two equivalent K(2), one Ba(1), two equivalent Ba(2), and one Sn(1) atom. In the fourth Sb site, Sb(3) is bonded in a 8-coordinate geometry to one K(2), one K(3), one K(4), two equivalent K(1), two equivalent Ba(1), and one Sn(1) atom.