Sr2VAs2O9 is Esseneite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), two equivalent O(8), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. In the second As site, As(2) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-49°. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the eighth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. In the ninth O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom.
Sr2VAs2O9 is Esseneite-like structured and crystallizes in the monoclinic Cc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), two equivalent O(8), and two equivalent O(9) atoms. The Sr(1)-O(1) bond length is 2.91 Å. The Sr(1)-O(2) bond length is 2.91 Å. The Sr(1)-O(3) bond length is 2.79 Å. The Sr(1)-O(4) bond length is 2.64 Å. The Sr(1)-O(5) bond length is 2.65 Å. There is one shorter (2.64 Å) and one longer (2.77 Å) Sr(1)-O(8) bond length. There is one shorter (2.63 Å) and one longer (2.78 Å) Sr(1)-O(9) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Sr(2)-O(1) bond length is 2.55 Å. The Sr(2)-O(2) bond length is 2.56 Å. The Sr(2)-O(4) bond length is 2.75 Å. The Sr(2)-O(5) bond length is 2.76 Å. The Sr(2)-O(6) bond length is 2.80 Å. The Sr(2)-O(7) bond length is 2.77 Å. The Sr(2)-O(8) bond length is 2.59 Å. The Sr(2)-O(9) bond length is 2.60 Å. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent As(1)O4 tetrahedra, and corners with two equivalent As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 37°. The V(1)-O(1) bond length is 2.02 Å. The V(1)-O(2) bond length is 2.03 Å. The V(1)-O(6) bond length is 2.05 Å. The V(1)-O(7) bond length is 2.05 Å. There is one shorter (1.71 Å) and one longer (2.13 Å) V(1)-O(3) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-55°. The As(1)-O(1) bond length is 1.75 Å. The As(1)-O(2) bond length is 1.75 Å. The As(1)-O(4) bond length is 1.69 Å. The As(1)-O(5) bond length is 1.69 Å. In the second As site, As(2) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-49°. The As(2)-O(6) bond length is 1.74 Å. The As(2)-O(7) bond length is 1.74 Å. The As(2)-O(8) bond length is 1.71 Å. The As(2)-O(9) bond length is 1.71 Å. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the second O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one As(2) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fourth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one V(1), and one As(1) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1) and two equivalent V(1) atoms. In the sixth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one As(1) atom. In the eighth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom. In the ninth O site, O(7) is bonded in a 3-coordinate geometry to one Sr(2), one V(1), and one As(2) atom.