Sr4U3ZnO12 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing UO6 octahedra. The corner-sharing octahedral tilt angles range from 32-34°. In the second U site, U(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form UO6 octahedra that share corners with two equivalent Zn(1)O6 octahedra and corners with four equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-34°. In the third U site, U(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form UO6 octahedra that share corners with two equivalent U(1)O6 octahedra and corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-32°. Zn(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent U(2)O6 octahedra and corners with four equivalent U(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-30°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one U(3), and one Zn(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one U(1), and one U(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one U(1), and one U(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one U(3), and one Zn(1) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one U(2), and one Zn(1) atom to form distorted OSr2UZn tetrahedra that share corners with two equivalent O(6)Sr2U2 tetrahedra and corners with two equivalent O(5)Sr2UZn tetrahedra. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one U(1), and one U(3) atom to form distorted OSr2U2 tetrahedra that share corners with two equivalent O(6)Sr2U2 tetrahedra and corners with two equivalent O(5)Sr2UZn tetrahedra.
Sr4U3ZnO12 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(1) atoms. The Sr(1)-O(2) bond length is 2.91 Å. The Sr(1)-O(3) bond length is 2.57 Å. The Sr(1)-O(4) bond length is 2.72 Å. The Sr(1)-O(5) bond length is 2.54 Å. The Sr(1)-O(6) bond length is 2.70 Å. There is one shorter (2.52 Å) and one longer (2.92 Å) Sr(1)-O(1) bond length. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. The Sr(2)-O(1) bond length is 2.65 Å. The Sr(2)-O(2) bond length is 2.62 Å. The Sr(2)-O(3) bond length is 2.86 Å. The Sr(2)-O(5) bond length is 2.61 Å. The Sr(2)-O(6) bond length is 2.52 Å. There is one shorter (2.61 Å) and one longer (2.80 Å) Sr(2)-O(4) bond length. There are three inequivalent U sites. In the first U site, U(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing UO6 octahedra. The corner-sharing octahedral tilt angles range from 32-34°. Both U(1)-O(2) bond lengths are 2.18 Å. Both U(1)-O(3) bond lengths are 2.19 Å. Both U(1)-O(6) bond lengths are 2.22 Å. In the second U site, U(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form UO6 octahedra that share corners with two equivalent Zn(1)O6 octahedra and corners with four equivalent U(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-34°. Both U(2)-O(2) bond lengths are 2.25 Å. Both U(2)-O(3) bond lengths are 2.23 Å. Both U(2)-O(5) bond lengths are 2.09 Å. In the third U site, U(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form UO6 octahedra that share corners with two equivalent U(1)O6 octahedra and corners with four equivalent Zn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-32°. Both U(3)-O(1) bond lengths are 2.15 Å. Both U(3)-O(4) bond lengths are 2.13 Å. Both U(3)-O(6) bond lengths are 2.23 Å. Zn(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form ZnO6 octahedra that share corners with two equivalent U(2)O6 octahedra and corners with four equivalent U(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-30°. Both Zn(1)-O(1) bond lengths are 2.17 Å. Both Zn(1)-O(4) bond lengths are 2.18 Å. Both Zn(1)-O(5) bond lengths are 2.34 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one U(3), and one Zn(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one U(1), and one U(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one U(1), and one U(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), one U(3), and one Zn(1) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Sr(2), one U(2), and one Zn(1) atom to form distorted OSr2UZn tetrahedra that share corners with two equivalent O(6)Sr2U2 tetrahedra and corners with two equivalent O(5)Sr2UZn tetrahedra. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(2), one U(1), and one U(3) atom to form distorted OSr2U2 tetrahedra that share corners with two equivalent O(6)Sr2U2 tetrahedra and corners with two equivalent O(5)Sr2UZn tetrahedra.