Ba5(Ga3O7)2 crystallizes in the orthorhombic Cmc2_1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing GaO4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form corner-sharing GaO4 tetrahedra. In the third Ga site, Ga(3) is bonded to one O(7), one O(9), and two equivalent O(5) atoms to form corner-sharing GaO4 tetrahedra. In the fourth Ga site, Ga(4) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form corner-sharing GaO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Ba(3) and two equivalent Ga(2) atoms. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ga(1), and one Ga(4) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ga(1), and one Ga(2) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(4) is bonded to one Ba(1), one Ba(2), one Ba(3), and one Ga(2) atom to form distorted OBa3Ga tetrahedra that share  a cornercorner with one O(4)Ba3Ga tetrahedra,  a cornercorner with one O(7)Ba2Ga2 trigonal pyramid, and  an edgeedge with one O(9)Ba3Ga tetrahedra. In the sixth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(3), one Ga(1), and one Ga(3) atom. In the seventh O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Ga(4) atom. In the eighth O site, O(7) is bonded to two equivalent Ba(1), one Ga(3), and one Ga(4) atom to form distorted corner-sharing OBa2Ga2 trigonal pyramids. In the ninth O site, O(9) is bonded to one Ba(3), two equivalent Ba(2), and one Ga(3) atom to form distorted OBa3Ga tetrahedra that share  a cornercorner with one O(7)Ba2Ga2 trigonal pyramid and edges with two equivalent O(4)Ba3Ga tetrahedra.
Ba5(Ga3O7)2 crystallizes in the orthorhombic Cmc2_1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Ba(1)-O(1) bond length is 2.75 Å. The Ba(1)-O(2) bond length is 3.28 Å. The Ba(1)-O(3) bond length is 2.66 Å. The Ba(1)-O(4) bond length is 2.56 Å. The Ba(1)-O(5) bond length is 3.01 Å. The Ba(1)-O(6) bond length is 2.84 Å. The Ba(1)-O(7) bond length is 2.60 Å. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. The Ba(2)-O(1) bond length is 2.69 Å. The Ba(2)-O(2) bond length is 2.85 Å. The Ba(2)-O(3) bond length is 2.62 Å. The Ba(2)-O(4) bond length is 2.76 Å. The Ba(2)-O(6) bond length is 2.77 Å. The Ba(2)-O(9) bond length is 2.59 Å. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. The Ba(3)-O(8) bond length is 2.74 Å. The Ba(3)-O(9) bond length is 2.61 Å. Both Ba(3)-O(2) bond lengths are 3.21 Å. Both Ba(3)-O(4) bond lengths are 2.74 Å. Both Ba(3)-O(5) bond lengths are 2.93 Å. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing GaO4 tetrahedra. The Ga(1)-O(1) bond length is 1.91 Å. The Ga(1)-O(2) bond length is 1.88 Å. The Ga(1)-O(3) bond length is 1.89 Å. The Ga(1)-O(5) bond length is 1.90 Å. In the second Ga site, Ga(2) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form corner-sharing GaO4 tetrahedra. The Ga(2)-O(2) bond length is 1.96 Å. The Ga(2)-O(3) bond length is 1.92 Å. The Ga(2)-O(4) bond length is 1.83 Å. The Ga(2)-O(8) bond length is 1.86 Å. In the third Ga site, Ga(3) is bonded to one O(7), one O(9), and two equivalent O(5) atoms to form corner-sharing GaO4 tetrahedra. The Ga(3)-O(7) bond length is 1.90 Å. The Ga(3)-O(9) bond length is 1.81 Å. Both Ga(3)-O(5) bond lengths are 1.92 Å. In the fourth Ga site, Ga(4) is bonded to one O(6), one O(7), and two equivalent O(1) atoms to form corner-sharing GaO4 tetrahedra. The Ga(4)-O(6) bond length is 1.84 Å. The Ga(4)-O(7) bond length is 1.93 Å. Both Ga(4)-O(1) bond lengths are 1.91 Å. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Ba(3) and two equivalent Ga(2) atoms. In the second O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ga(1), and one Ga(4) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ga(1), and one Ga(2) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Ga(1), and one Ga(2) atom. In the fifth O site, O(4) is bonded to one Ba(1), one Ba(2), one Ba(3), and one Ga(2) atom to form distorted OBa3Ga tetrahedra that share  a cornercorner with one O(4)Ba3Ga tetrahedra,  a cornercorner with one O(7)Ba2Ga2 trigonal pyramid, and  an edgeedge with one O(9)Ba3Ga tetrahedra. In the sixth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Ba(3), one Ga(1), and one Ga(3) atom. In the seventh O site, O(6) is bonded in a 5-coordinate geometry to two equivalent Ba(1), two equivalent Ba(2), and one Ga(4) atom. In the eighth O site, O(7) is bonded to two equivalent Ba(1), one Ga(3), and one Ga(4) atom to form distorted corner-sharing OBa2Ga2 trigonal pyramids. In the ninth O site, O(9) is bonded to one Ba(3), two equivalent Ba(2), and one Ga(3) atom to form distorted OBa3Ga tetrahedra that share  a cornercorner with one O(7)Ba2Ga2 trigonal pyramid and edges with two equivalent O(4)Ba3Ga tetrahedra.