Sr2YV2GaO7 crystallizes in the monoclinic C2 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(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form distorted VO5 square pyramids that share corners with four equivalent V(2)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. In the second V site, V(2) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form VO5 square pyramids that share corners with four equivalent V(1)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. Ga(1) is bonded to one O(4), one O(7), and two equivalent O(2) atoms to form GaO4 tetrahedra that share  a cornercorner with one V(1)O5 square pyramid,  a cornercorner with one V(2)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), one V(1), and one Ga(1) atom. In the second O site, O(1) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with four equivalent O(6)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(5)Sr2Y2V2 octahedra, edges with two equivalent O(6)Sr2Y2V2 octahedra, faces with two equivalent O(3)Sr2Y2V2 octahedra, and faces with two equivalent O(5)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the third O site, O(2) is bonded to one Sr(1), one Sr(2), and two equivalent Ga(1) atoms to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, and corners with two equivalent O(2)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-75°. In the fourth O site, O(3) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with four equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(6)Sr2Y2V2 octahedra, edges with two equivalent O(5)Sr2Y2V2 octahedra, faces with two equivalent O(1)Sr2Y2V2 octahedra, and faces with two equivalent O(6)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the fifth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one V(2), and one Ga(1) atom. In the sixth O site, O(5) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, corners with four equivalent O(3)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(1)Sr2Y2V2 octahedra, edges with two equivalent O(3)Sr2Y2V2 octahedra, faces with two equivalent O(1)Sr2Y2V2 octahedra, and faces with two equivalent O(6)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the seventh O site, O(6) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, corners with four equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(3)Sr2Y2V2 octahedra, edges with two equivalent O(1)Sr2Y2V2 octahedra, faces with two equivalent O(3)Sr2Y2V2 octahedra, and faces with two equivalent O(5)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°.
Sr2YV2GaO7 crystallizes in the monoclinic C2 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(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. The Sr(1)-O(1) bond length is 2.78 Å. The Sr(1)-O(2) bond length is 2.45 Å. The Sr(1)-O(3) bond length is 2.75 Å. The Sr(1)-O(5) bond length is 2.76 Å. The Sr(1)-O(6) bond length is 2.89 Å. There is one shorter (2.55 Å) and one longer (3.22 Å) Sr(1)-O(4) bond length. There is one shorter (2.65 Å) and one longer (3.04 Å) Sr(1)-O(7) 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(3), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. The Sr(2)-O(1) bond length is 2.74 Å. The Sr(2)-O(2) bond length is 2.47 Å. The Sr(2)-O(3) bond length is 2.78 Å. The Sr(2)-O(5) bond length is 2.91 Å. The Sr(2)-O(6) bond length is 2.80 Å. The Sr(2)-O(7) bond length is 2.46 Å. There is one shorter (2.67 Å) and one longer (2.98 Å) Sr(2)-O(4) bond length. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. Both Y(1)-O(1) bond lengths are 2.47 Å. Both Y(1)-O(3) bond lengths are 2.57 Å. Both Y(1)-O(5) bond lengths are 2.60 Å. Both Y(1)-O(6) bond lengths are 2.52 Å. In the second Y site, Y(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. Both Y(2)-O(1) bond lengths are 2.55 Å. Both Y(2)-O(3) bond lengths are 2.45 Å. Both Y(2)-O(5) bond lengths are 2.51 Å. Both Y(2)-O(6) bond lengths are 2.58 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form distorted VO5 square pyramids that share corners with four equivalent V(2)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. The V(1)-O(1) bond length is 1.98 Å. The V(1)-O(3) bond length is 1.98 Å. The V(1)-O(5) bond length is 1.99 Å. The V(1)-O(6) bond length is 1.99 Å. The V(1)-O(7) bond length is 2.48 Å. In the second V site, V(2) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(6) atom to form VO5 square pyramids that share corners with four equivalent V(1)O5 square pyramids and  a cornercorner with one Ga(1)O4 tetrahedra. The V(2)-O(1) bond length is 1.99 Å. The V(2)-O(3) bond length is 2.00 Å. The V(2)-O(4) bond length is 2.37 Å. The V(2)-O(5) bond length is 2.01 Å. The V(2)-O(6) bond length is 2.01 Å. Ga(1) is bonded to one O(4), one O(7), and two equivalent O(2) atoms to form GaO4 tetrahedra that share  a cornercorner with one V(1)O5 square pyramid,  a cornercorner with one V(2)O5 square pyramid, and corners with two equivalent Ga(1)O4 tetrahedra. The Ga(1)-O(4) bond length is 1.88 Å. The Ga(1)-O(7) bond length is 1.86 Å. There is one shorter (1.94 Å) and one longer (1.96 Å) Ga(1)-O(2) bond length. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), one V(1), and one Ga(1) atom. In the second O site, O(1) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with four equivalent O(6)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(5)Sr2Y2V2 octahedra, edges with two equivalent O(6)Sr2Y2V2 octahedra, faces with two equivalent O(3)Sr2Y2V2 octahedra, and faces with two equivalent O(5)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the third O site, O(2) is bonded to one Sr(1), one Sr(2), and two equivalent Ga(1) atoms to form distorted OSr2Ga2 tetrahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, and corners with two equivalent O(2)Sr2Ga2 tetrahedra. The corner-sharing octahedral tilt angles range from 18-75°. In the fourth O site, O(3) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(3)Sr2Y2V2 octahedra, corners with four equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(6)Sr2Y2V2 octahedra, edges with two equivalent O(5)Sr2Y2V2 octahedra, faces with two equivalent O(1)Sr2Y2V2 octahedra, and faces with two equivalent O(6)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the fifth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one V(2), and one Ga(1) atom. In the sixth O site, O(5) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, corners with four equivalent O(3)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(1)Sr2Y2V2 octahedra, edges with two equivalent O(3)Sr2Y2V2 octahedra, faces with two equivalent O(1)Sr2Y2V2 octahedra, and faces with two equivalent O(6)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. In the seventh O site, O(6) is bonded to one Sr(1), one Sr(2), one Y(1), one Y(2), one V(1), and one V(2) atom to form distorted OSr2Y2V2 octahedra that share corners with two equivalent O(5)Sr2Y2V2 octahedra, corners with two equivalent O(6)Sr2Y2V2 octahedra, corners with four equivalent O(1)Sr2Y2V2 octahedra, corners with two equivalent O(2)Sr2Ga2 tetrahedra,  an edgeedge with one O(3)Sr2Y2V2 octahedra, edges with two equivalent O(1)Sr2Y2V2 octahedra, faces with two equivalent O(3)Sr2Y2V2 octahedra, and faces with two equivalent O(5)Sr2Y2V2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°.