BaVSi2O7 crystallizes in the orthorhombic Ama2 space group. Ba(1) is bonded in a 11-coordinate geometry to one O(3), two equivalent O(4), four equivalent O(1), and four equivalent O(5) atoms. V(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(5) atoms. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one V(1), and one Si(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a single-bond geometry to one Ba(1) and one V(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Si(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one V(1), and one Si(1) atom.
BaVSi2O7 crystallizes in the orthorhombic Ama2 space group. Ba(1) is bonded in a 11-coordinate geometry to one O(3), two equivalent O(4), four equivalent O(1), and four equivalent O(5) atoms. The Ba(1)-O(3) bond length is 3.21 Å. There is one shorter (2.94 Å) and one longer (2.98 Å) Ba(1)-O(4) bond length. There are two shorter (2.78 Å) and two longer (2.99 Å) Ba(1)-O(1) bond lengths. There are two shorter (2.77 Å) and two longer (2.94 Å) Ba(1)-O(5) bond lengths. V(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(5) atoms. The V(1)-O(3) bond length is 1.64 Å. Both V(1)-O(1) bond lengths are 2.02 Å. Both V(1)-O(5) bond lengths are 2.03 Å. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.61 Å. The Si(1)-O(4) bond length is 1.68 Å. The Si(1)-O(5) bond length is 1.63 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one V(1), and one Si(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a single-bond geometry to one Ba(1) and one V(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Si(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one V(1), and one Si(1) atom.