Ba2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(2), one O(3), one O(7), and two equivalent O(9) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(14), one O(2), one O(4), one O(8), and two equivalent O(10) atoms. Mg(1) is bonded to one O(1), one O(13), one O(14), one O(3), and one O(4) atom to form distorted MgO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one V(1)O4 trigonal pyramid, and  an edgeedge with one Si(3)O4 tetrahedra. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(12), one O(14), one O(2), and one O(7) atom to form distorted VO4 trigonal pyramids that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second V site, V(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(13), one O(3), and one O(8) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(2), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O4 trigonal pyramids. In the third Si site, Si(3) is bonded to one O(13), one O(3), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. In the fourth Si site, Si(4) is bonded to one O(10), one O(14), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one V(1)O4 trigonal pyramid. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), one V(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one V(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), one V(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one Mg(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Ba(1) and one V(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ba(2) and one V(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Ba(1), one Si(1), and one Si(3) atom. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(2), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(1), one V(2), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one V(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), one V(2), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ba(2), one Mg(1), one V(1), and one Si(4) atom.
Ba2MgV2(Si2O7)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(2), one O(3), one O(7), and two equivalent O(9) atoms. The Ba(1)-O(1) bond length is 3.17 Å. The Ba(1)-O(11) bond length is 2.80 Å. The Ba(1)-O(12) bond length is 2.90 Å. The Ba(1)-O(13) bond length is 2.65 Å. The Ba(1)-O(2) bond length is 3.02 Å. The Ba(1)-O(3) bond length is 2.73 Å. The Ba(1)-O(7) bond length is 2.56 Å. There is one shorter (2.93 Å) and one longer (3.13 Å) Ba(1)-O(9) bond length. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(14), one O(2), one O(4), one O(8), and two equivalent O(10) atoms. The Ba(2)-O(1) bond length is 3.00 Å. The Ba(2)-O(12) bond length is 2.67 Å. The Ba(2)-O(14) bond length is 2.81 Å. The Ba(2)-O(2) bond length is 2.68 Å. The Ba(2)-O(4) bond length is 2.76 Å. The Ba(2)-O(8) bond length is 2.38 Å. There is one shorter (2.84 Å) and one longer (2.89 Å) Ba(2)-O(10) bond length. Mg(1) is bonded to one O(1), one O(13), one O(14), one O(3), and one O(4) atom to form distorted MgO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one V(1)O4 trigonal pyramid, and  an edgeedge with one Si(3)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.15 Å. The Mg(1)-O(13) bond length is 2.01 Å. The Mg(1)-O(14) bond length is 2.19 Å. The Mg(1)-O(3) bond length is 2.21 Å. The Mg(1)-O(4) bond length is 2.10 Å. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(12), one O(14), one O(2), and one O(7) atom to form distorted VO4 trigonal pyramids that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. The V(1)-O(12) bond length is 2.07 Å. The V(1)-O(14) bond length is 2.15 Å. The V(1)-O(2) bond length is 2.09 Å. The V(1)-O(7) bond length is 1.71 Å. In the second V site, V(2) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(13), one O(3), and one O(8) atom. The V(2)-O(1) bond length is 2.18 Å. The V(2)-O(11) bond length is 2.03 Å. The V(2)-O(13) bond length is 2.68 Å. The V(2)-O(3) bond length is 2.04 Å. The V(2)-O(8) bond length is 1.74 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(11), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(11) bond length is 1.63 Å. The Si(1)-O(5) bond length is 1.61 Å. The Si(1)-O(9) bond length is 1.67 Å. In the second Si site, Si(2) is bonded to one O(10), one O(12), one O(2), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and corners with two equivalent V(1)O4 trigonal pyramids. The Si(2)-O(10) bond length is 1.71 Å. The Si(2)-O(12) bond length is 1.63 Å. The Si(2)-O(2) bond length is 1.63 Å. The Si(2)-O(5) bond length is 1.61 Å. In the third Si site, Si(3) is bonded to one O(13), one O(3), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  an edgeedge with one Mg(1)O5 square pyramid. The Si(3)-O(13) bond length is 1.63 Å. The Si(3)-O(3) bond length is 1.66 Å. The Si(3)-O(6) bond length is 1.63 Å. The Si(3)-O(9) bond length is 1.69 Å. In the fourth Si site, Si(4) is bonded to one O(10), one O(14), one O(4), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one V(1)O4 trigonal pyramid. The Si(4)-O(10) bond length is 1.71 Å. The Si(4)-O(14) bond length is 1.66 Å. The Si(4)-O(4) bond length is 1.62 Å. The Si(4)-O(6) bond length is 1.65 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), one V(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one V(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), one V(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(2), one Mg(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Si(1) and one Si(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Ba(1) and one V(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ba(2) and one V(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to two equivalent Ba(1), one Si(1), and one Si(3) atom. In the tenth O site, O(10) is bonded in a distorted linear geometry to two equivalent Ba(2), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(1), one V(2), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one V(1), and one Si(2) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Ba(1), one Mg(1), one V(2), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Ba(2), one Mg(1), one V(1), and one Si(4) atom.