K4Ba2SnBi4 crystallizes in the monoclinic Cm space group. There are five inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one Sn(1), one Bi(1), one Bi(2), one Bi(3), one Bi(4), and one Bi(6) atom. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(2), one Bi(3), and one Bi(5) atom. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Bi(4), one Bi(5), and two equivalent Bi(1) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(3), one Bi(4), and one Bi(6) atom. In the fifth K site, K(5) is bonded in a 4-coordinate geometry to one Bi(2), one Bi(6), and two equivalent Bi(3) atoms. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 3-coordinate geometry to one Sn(1), one Bi(6), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one Sn(2), one Bi(1), one Bi(2), one Bi(3), one Bi(4), one Bi(5), and one Bi(6) atom. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one Sn(2), one Bi(5), one Bi(6), two equivalent Bi(1), and two equivalent Bi(3) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 7-coordinate geometry to two equivalent K(1), one Ba(1), one Bi(4), one Bi(5), and two equivalent Bi(3) atoms. In the second Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Ba(3), two equivalent Ba(2), one Bi(2), one Bi(6), and two equivalent Bi(1) atoms. There are six inequivalent Bi sites. In the first Bi site, Bi(4) is bonded in a 8-coordinate geometry to one K(3), two equivalent K(1), two equivalent K(4), two equivalent Ba(2), and one Sn(1) atom. In the second Bi site, Bi(5) is bonded in a 7-coordinate geometry to one K(3), two equivalent K(2), one Ba(3), two equivalent Ba(2), and one Sn(1) atom. In the third Bi site, Bi(6) is bonded in a 10-coordinate geometry to one K(5), two equivalent K(1), two equivalent K(4), one Ba(1), one Ba(3), two equivalent Ba(2), and one Sn(2) atom. In the fourth Bi site, Bi(1) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Ba(1), one Ba(2), one Ba(3), and one Sn(2) atom. In the fifth Bi site, Bi(2) is bonded in a 8-coordinate geometry to one K(5), two equivalent K(1), two equivalent K(2), two equivalent Ba(2), and one Sn(2) atom. In the sixth Bi site, Bi(3) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(4), one K(5), one Ba(1), one Ba(2), one Ba(3), and one Sn(1) atom.
K4Ba2SnBi4 crystallizes in the monoclinic Cm space group. There are five inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one Sn(1), one Bi(1), one Bi(2), one Bi(3), one Bi(4), and one Bi(6) atom. The K(1)-Sn(1) bond length is 3.91 Å. The K(1)-Bi(1) bond length is 3.71 Å. The K(1)-Bi(2) bond length is 3.75 Å. The K(1)-Bi(3) bond length is 3.97 Å. The K(1)-Bi(4) bond length is 3.97 Å. The K(1)-Bi(6) bond length is 3.73 Å. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(2), one Bi(3), and one Bi(5) atom. The K(2)-Bi(1) bond length is 3.53 Å. The K(2)-Bi(2) bond length is 3.50 Å. The K(2)-Bi(3) bond length is 3.66 Å. The K(2)-Bi(5) bond length is 3.72 Å. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Bi(4), one Bi(5), and two equivalent Bi(1) atoms. The K(3)-Bi(4) bond length is 3.64 Å. The K(3)-Bi(5) bond length is 3.72 Å. Both K(3)-Bi(1) bond lengths are 3.60 Å. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(3), one Bi(4), and one Bi(6) atom. The K(4)-Bi(1) bond length is 3.73 Å. The K(4)-Bi(3) bond length is 3.49 Å. The K(4)-Bi(4) bond length is 3.47 Å. The K(4)-Bi(6) bond length is 3.73 Å. In the fifth K site, K(5) is bonded in a 4-coordinate geometry to one Bi(2), one Bi(6), and two equivalent Bi(3) atoms. The K(5)-Bi(2) bond length is 3.74 Å. The K(5)-Bi(6) bond length is 3.75 Å. Both K(5)-Bi(3) bond lengths are 3.55 Å. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 3-coordinate geometry to one Sn(1), one Bi(6), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Ba(1)-Sn(1) bond length is 3.87 Å. The Ba(1)-Bi(6) bond length is 3.68 Å. Both Ba(1)-Bi(1) bond lengths are 3.63 Å. Both Ba(1)-Bi(3) bond lengths are 3.84 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one Sn(2), one Bi(1), one Bi(2), one Bi(3), one Bi(4), one Bi(5), and one Bi(6) atom. The Ba(2)-Sn(2) bond length is 3.83 Å. The Ba(2)-Bi(1) bond length is 3.84 Å. The Ba(2)-Bi(2) bond length is 3.77 Å. The Ba(2)-Bi(3) bond length is 3.65 Å. The Ba(2)-Bi(4) bond length is 3.62 Å. The Ba(2)-Bi(5) bond length is 3.78 Å. The Ba(2)-Bi(6) bond length is 4.19 Å. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one Sn(2), one Bi(5), one Bi(6), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Ba(3)-Sn(2) bond length is 3.79 Å. The Ba(3)-Bi(5) bond length is 3.65 Å. The Ba(3)-Bi(6) bond length is 3.98 Å. Both Ba(3)-Bi(1) bond lengths are 3.85 Å. Both Ba(3)-Bi(3) bond lengths are 3.64 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 7-coordinate geometry to two equivalent K(1), one Ba(1), one Bi(4), one Bi(5), and two equivalent Bi(3) atoms. The Sn(1)-Bi(4) bond length is 2.92 Å. The Sn(1)-Bi(5) bond length is 2.99 Å. Both Sn(1)-Bi(3) bond lengths are 2.95 Å. In the second Sn site, Sn(2) is bonded in a 7-coordinate geometry to one Ba(3), two equivalent Ba(2), one Bi(2), one Bi(6), and two equivalent Bi(1) atoms. The Sn(2)-Bi(2) bond length is 2.92 Å. The Sn(2)-Bi(6) bond length is 2.95 Å. Both Sn(2)-Bi(1) bond lengths are 2.95 Å. There are six inequivalent Bi sites. In the first Bi site, Bi(4) is bonded in a 8-coordinate geometry to one K(3), two equivalent K(1), two equivalent K(4), two equivalent Ba(2), and one Sn(1) atom. In the second Bi site, Bi(5) is bonded in a 7-coordinate geometry to one K(3), two equivalent K(2), one Ba(3), two equivalent Ba(2), and one Sn(1) atom. In the third Bi site, Bi(6) is bonded in a 10-coordinate geometry to one K(5), two equivalent K(1), two equivalent K(4), one Ba(1), one Ba(3), two equivalent Ba(2), and one Sn(2) atom. In the fourth Bi site, Bi(1) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one Ba(1), one Ba(2), one Ba(3), and one Sn(2) atom. In the fifth Bi site, Bi(2) is bonded in a 8-coordinate geometry to one K(5), two equivalent K(1), two equivalent K(2), two equivalent Ba(2), and one Sn(2) atom. In the sixth Bi site, Bi(3) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(4), one K(5), one Ba(1), one Ba(2), one Ba(3), and one Sn(1) atom.