Ba5Y3I19 crystallizes in the triclinic P-1 space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(12), one I(13), one I(16), one I(17), one I(4), one I(6), and two equivalent I(9) atoms. In the second Ba site, Ba(2) is bonded to one I(12), one I(15), one I(3), one I(5), one I(6), and one I(8) atom to form distorted BaI6 pentagonal pyramids that share  a cornercorner with one Y(3)I6 octahedra,  an edgeedge with one Y(1)I6 octahedra, and  an edgeedge with one Y(2)I6 octahedra. The corner-sharing octahedral tilt angles are 39°. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one I(13), one I(16), one I(2), one I(3), one I(5), one I(7), and one I(9) atom. In the fourth Ba site, Ba(4) is bonded in a 7-coordinate geometry to one I(1), one I(14), one I(16), one I(17), one I(19), one I(2), and one I(8) atom. In the fifth Ba site, Ba(5) is bonded in a 7-coordinate geometry to one I(12), one I(15), one I(17), one I(18), one I(19), one I(20), and one I(4) atom. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one I(1), one I(19), one I(2), one I(4), one I(5), and one I(6) atom to form YI6 octahedra that share  an edgeedge with one Ba(2)I6 pentagonal pyramid. In the second Y site, Y(2) is bonded to one I(10), one I(11), one I(14), one I(15), one I(7), and one I(8) atom to form YI6 octahedra that share corners with two equivalent Y(2)I6 octahedra and  an edgeedge with one Ba(2)I6 pentagonal pyramid. The corner-sharing octahedra are not tilted. In the third Y site, Y(3) is bonded to one I(13), one I(17), one I(18), one I(20), one I(3), and one I(9) atom to form YI6 octahedra that share  a cornercorner with one Ba(2)I6 pentagonal pyramid. There are twenty inequivalent I sites. In the first I site, I(1) is bonded in a bent 150 degrees geometry to one Ba(4) and one Y(1) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one Ba(3), one Ba(4), and one Y(1) atom. In the third I site, I(3) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(3), and one Y(3) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(5), and one Y(1) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one Ba(3), and one Y(1) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the seventh I site, I(7) is bonded in a distorted bent 120 degrees geometry to one Ba(3) and one Y(2) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(4), and one Y(2) atom. In the ninth I site, I(9) is bonded in a 4-coordinate geometry to one Ba(3), two equivalent Ba(1), and one Y(3) atom. In the tenth I site, I(10) is bonded in a linear geometry to two equivalent Y(2) atoms. In the eleventh I site, I(11) is bonded in a linear geometry to two equivalent Y(2) atoms. In the twelfth I site, I(12) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(5) atom. In the thirteenth I site, I(13) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Y(3) atom. In the fourteenth I site, I(14) is bonded in a water-like geometry to one Ba(4) and one Y(2) atom. In the fifteenth I site, I(15) is bonded in a 2-coordinate geometry to one Ba(2), one Ba(5), and one Y(2) atom. In the sixteenth I site, I(16) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Ba(4) atom. In the seventeenth I site, I(17) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(4), one Ba(5), and one Y(3) atom. In the eighteenth I site, I(18) is bonded in a bent 150 degrees geometry to one Ba(5) and one Y(3) atom. In the nineteenth I site, I(19) is bonded in a 3-coordinate geometry to one Ba(4), one Ba(5), and one Y(1) atom. In the twentieth I site, I(20) is bonded in a bent 120 degrees geometry to one Ba(5) and one Y(3) atom.
Ba5Y3I19 crystallizes in the triclinic P-1 space group. There are five inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(12), one I(13), one I(16), one I(17), one I(4), one I(6), and two equivalent I(9) atoms. The Ba(1)-I(12) bond length is 3.50 Å. The Ba(1)-I(13) bond length is 3.53 Å. The Ba(1)-I(16) bond length is 3.48 Å. The Ba(1)-I(17) bond length is 3.76 Å. The Ba(1)-I(4) bond length is 4.06 Å. The Ba(1)-I(6) bond length is 3.83 Å. There is one shorter (3.57 Å) and one longer (4.03 Å) Ba(1)-I(9) bond length. In the second Ba site, Ba(2) is bonded to one I(12), one I(15), one I(3), one I(5), one I(6), and one I(8) atom to form distorted BaI6 pentagonal pyramids that share  a cornercorner with one Y(3)I6 octahedra,  an edgeedge with one Y(1)I6 octahedra, and  an edgeedge with one Y(2)I6 octahedra. The corner-sharing octahedral tilt angles are 39°. The Ba(2)-I(12) bond length is 3.43 Å. The Ba(2)-I(15) bond length is 3.62 Å. The Ba(2)-I(3) bond length is 3.49 Å. The Ba(2)-I(5) bond length is 3.58 Å. The Ba(2)-I(6) bond length is 3.55 Å. The Ba(2)-I(8) bond length is 3.49 Å. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one I(13), one I(16), one I(2), one I(3), one I(5), one I(7), and one I(9) atom. The Ba(3)-I(13) bond length is 3.51 Å. The Ba(3)-I(16) bond length is 3.43 Å. The Ba(3)-I(2) bond length is 3.73 Å. The Ba(3)-I(3) bond length is 3.80 Å. The Ba(3)-I(5) bond length is 3.43 Å. The Ba(3)-I(7) bond length is 3.47 Å. The Ba(3)-I(9) bond length is 4.07 Å. In the fourth Ba site, Ba(4) is bonded in a 7-coordinate geometry to one I(1), one I(14), one I(16), one I(17), one I(19), one I(2), and one I(8) atom. The Ba(4)-I(1) bond length is 3.63 Å. The Ba(4)-I(14) bond length is 3.51 Å. The Ba(4)-I(16) bond length is 3.39 Å. The Ba(4)-I(17) bond length is 3.91 Å. The Ba(4)-I(19) bond length is 3.89 Å. The Ba(4)-I(2) bond length is 3.84 Å. The Ba(4)-I(8) bond length is 3.56 Å. In the fifth Ba site, Ba(5) is bonded in a 7-coordinate geometry to one I(12), one I(15), one I(17), one I(18), one I(19), one I(20), and one I(4) atom. The Ba(5)-I(12) bond length is 3.49 Å. The Ba(5)-I(15) bond length is 4.23 Å. The Ba(5)-I(17) bond length is 4.01 Å. The Ba(5)-I(18) bond length is 3.60 Å. The Ba(5)-I(19) bond length is 3.58 Å. The Ba(5)-I(20) bond length is 3.63 Å. The Ba(5)-I(4) bond length is 3.59 Å. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one I(1), one I(19), one I(2), one I(4), one I(5), and one I(6) atom to form YI6 octahedra that share  an edgeedge with one Ba(2)I6 pentagonal pyramid. The Y(1)-I(1) bond length is 2.96 Å. The Y(1)-I(19) bond length is 3.10 Å. The Y(1)-I(2) bond length is 3.09 Å. The Y(1)-I(4) bond length is 3.06 Å. The Y(1)-I(5) bond length is 3.09 Å. The Y(1)-I(6) bond length is 3.08 Å. In the second Y site, Y(2) is bonded to one I(10), one I(11), one I(14), one I(15), one I(7), and one I(8) atom to form YI6 octahedra that share corners with two equivalent Y(2)I6 octahedra and  an edgeedge with one Ba(2)I6 pentagonal pyramid. The corner-sharing octahedra are not tilted. The Y(2)-I(10) bond length is 2.98 Å. The Y(2)-I(11) bond length is 2.96 Å. The Y(2)-I(14) bond length is 3.03 Å. The Y(2)-I(15) bond length is 3.08 Å. The Y(2)-I(7) bond length is 2.96 Å. The Y(2)-I(8) bond length is 3.09 Å. In the third Y site, Y(3) is bonded to one I(13), one I(17), one I(18), one I(20), one I(3), and one I(9) atom to form YI6 octahedra that share  a cornercorner with one Ba(2)I6 pentagonal pyramid. The Y(3)-I(13) bond length is 3.12 Å. The Y(3)-I(17) bond length is 3.16 Å. The Y(3)-I(18) bond length is 2.99 Å. The Y(3)-I(20) bond length is 2.98 Å. The Y(3)-I(3) bond length is 3.09 Å. The Y(3)-I(9) bond length is 3.07 Å. There are twenty inequivalent I sites. In the first I site, I(1) is bonded in a bent 150 degrees geometry to one Ba(4) and one Y(1) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one Ba(3), one Ba(4), and one Y(1) atom. In the third I site, I(3) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(3), and one Y(3) atom. In the fourth I site, I(4) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(5), and one Y(1) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one Ba(3), and one Y(1) atom. In the sixth I site, I(6) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the seventh I site, I(7) is bonded in a distorted bent 120 degrees geometry to one Ba(3) and one Y(2) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(4), and one Y(2) atom. In the ninth I site, I(9) is bonded in a 4-coordinate geometry to one Ba(3), two equivalent Ba(1), and one Y(3) atom. In the tenth I site, I(10) is bonded in a linear geometry to two equivalent Y(2) atoms. In the eleventh I site, I(11) is bonded in a linear geometry to two equivalent Y(2) atoms. In the twelfth I site, I(12) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(5) atom. In the thirteenth I site, I(13) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Y(3) atom. In the fourteenth I site, I(14) is bonded in a water-like geometry to one Ba(4) and one Y(2) atom. In the fifteenth I site, I(15) is bonded in a 2-coordinate geometry to one Ba(2), one Ba(5), and one Y(2) atom. In the sixteenth I site, I(16) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Ba(4) atom. In the seventeenth I site, I(17) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(4), one Ba(5), and one Y(3) atom. In the eighteenth I site, I(18) is bonded in a bent 150 degrees geometry to one Ba(5) and one Y(3) atom. In the nineteenth I site, I(19) is bonded in a 3-coordinate geometry to one Ba(4), one Ba(5), and one Y(1) atom. In the twentieth I site, I(20) is bonded in a bent 120 degrees geometry to one Ba(5) and one Y(3) atom.