Sr9Cd4Bi9 crystallizes in the orthorhombic Pbam space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent Cd(1), two equivalent Cd(2), one Bi(4), two equivalent Bi(1), and two equivalent Bi(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent Cd(1), one Bi(3), two equivalent Bi(1), and two equivalent Bi(5) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to two equivalent Cd(1), two equivalent Bi(2), and four equivalent Bi(4) atoms. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one Cd(1), one Bi(2), one Bi(5), two equivalent Bi(3), and two equivalent Bi(4) atoms. In the fifth Sr site, Sr(5) is bonded to two equivalent Bi(1), two equivalent Bi(2), and two equivalent Bi(3) atoms to form a mixture of distorted corner and edge-sharing SrBi6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 10-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), two equivalent Sr(2), one Bi(1), one Bi(5), and two equivalent Bi(4) atoms. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Bi(1), one Bi(2), and two equivalent Bi(3) atoms. There are five inequivalent Bi sites. In the first Bi site, Bi(3) is bonded in a 7-coordinate geometry to one Sr(2), two equivalent Sr(4), two equivalent Sr(5), and two equivalent Cd(2) atoms. In the second Bi site, Bi(4) is bonded in a 7-coordinate geometry to one Sr(1), two equivalent Sr(3), two equivalent Sr(4), and two equivalent Cd(1) atoms. In the third Bi site, Bi(5) is bonded in a distorted body-centered cubic geometry to two equivalent Sr(4), four equivalent Sr(2), and two equivalent Cd(1) atoms. In the fourth Bi site, Bi(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(5), one Cd(1), and one Cd(2) atom. In the fifth Bi site, Bi(2) is bonded to one Sr(3), one Sr(4), two equivalent Sr(1), two equivalent Sr(5), and one Cd(2) atom to form a mixture of distorted corner and edge-sharing BiSr6Cd pentagonal bipyramids.
Sr9Cd4Bi9 crystallizes in the orthorhombic Pbam space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent Cd(1), two equivalent Cd(2), one Bi(4), two equivalent Bi(1), and two equivalent Bi(2) atoms. Both Sr(1)-Cd(1) bond lengths are 3.75 Å. Both Sr(1)-Cd(2) bond lengths are 3.47 Å. The Sr(1)-Bi(4) bond length is 3.51 Å. Both Sr(1)-Bi(1) bond lengths are 3.51 Å. Both Sr(1)-Bi(2) bond lengths are 3.41 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent Cd(1), one Bi(3), two equivalent Bi(1), and two equivalent Bi(5) atoms. Both Sr(2)-Cd(1) bond lengths are 3.45 Å. The Sr(2)-Bi(3) bond length is 3.46 Å. Both Sr(2)-Bi(1) bond lengths are 3.51 Å. Both Sr(2)-Bi(5) bond lengths are 3.36 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to two equivalent Cd(1), two equivalent Bi(2), and four equivalent Bi(4) atoms. Both Sr(3)-Cd(1) bond lengths are 3.78 Å. Both Sr(3)-Bi(2) bond lengths are 3.49 Å. All Sr(3)-Bi(4) bond lengths are 3.54 Å. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one Cd(1), one Bi(2), one Bi(5), two equivalent Bi(3), and two equivalent Bi(4) atoms. The Sr(4)-Cd(1) bond length is 3.51 Å. The Sr(4)-Bi(2) bond length is 3.47 Å. The Sr(4)-Bi(5) bond length is 3.70 Å. Both Sr(4)-Bi(3) bond lengths are 3.48 Å. Both Sr(4)-Bi(4) bond lengths are 3.57 Å. In the fifth Sr site, Sr(5) is bonded to two equivalent Bi(1), two equivalent Bi(2), and two equivalent Bi(3) atoms to form a mixture of distorted corner and edge-sharing SrBi6 octahedra. The corner-sharing octahedral tilt angles are 44°. Both Sr(5)-Bi(1) bond lengths are 3.45 Å. Both Sr(5)-Bi(2) bond lengths are 3.43 Å. There is one shorter (3.59 Å) and one longer (3.66 Å) Sr(5)-Bi(3) bond length. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 10-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), two equivalent Sr(2), one Bi(1), one Bi(5), and two equivalent Bi(4) atoms. The Cd(1)-Bi(1) bond length is 2.95 Å. The Cd(1)-Bi(5) bond length is 3.24 Å. Both Cd(1)-Bi(4) bond lengths are 2.99 Å. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), one Bi(1), one Bi(2), and two equivalent Bi(3) atoms. The Cd(2)-Bi(1) bond length is 3.11 Å. The Cd(2)-Bi(2) bond length is 3.02 Å. Both Cd(2)-Bi(3) bond lengths are 2.95 Å. There are five inequivalent Bi sites. In the first Bi site, Bi(3) is bonded in a 7-coordinate geometry to one Sr(2), two equivalent Sr(4), two equivalent Sr(5), and two equivalent Cd(2) atoms. In the second Bi site, Bi(4) is bonded in a 7-coordinate geometry to one Sr(1), two equivalent Sr(3), two equivalent Sr(4), and two equivalent Cd(1) atoms. In the third Bi site, Bi(5) is bonded in a distorted body-centered cubic geometry to two equivalent Sr(4), four equivalent Sr(2), and two equivalent Cd(1) atoms. In the fourth Bi site, Bi(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(5), one Cd(1), and one Cd(2) atom. In the fifth Bi site, Bi(2) is bonded to one Sr(3), one Sr(4), two equivalent Sr(1), two equivalent Sr(5), and one Cd(2) atom to form a mixture of distorted corner and edge-sharing BiSr6Cd pentagonal bipyramids.