Cs2Ga2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to one B(2), two equivalent B(1), one O(3), one O(5), two equivalent O(6), two equivalent O(7), and three equivalent O(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form corner-sharing GaO4 tetrahedra. In the second Ga site, Ga(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form corner-sharing GaO4 tetrahedra. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to two equivalent Cs(2), one O(2), one O(3), and one O(4) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one Cs(2), one O(1), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 2-coordinate geometry to one Cs(1), two equivalent Cs(2), one Ga(1), and one Ga(2) atom. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cs(1), one Ga(2), and one B(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(2), one Ga(1), and one B(1) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(2), two equivalent Cs(1), one Ga(2), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Ga(1), and one B(1) atom. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(2), one Ga(1), and one B(2) atom. In the seventh O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cs(1), two equivalent Cs(2), one Ga(2), and one B(2) atom.
Cs2Ga2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. The Cs(1)-O(5) bond length is 2.92 Å. The Cs(1)-O(6) bond length is 3.48 Å. The Cs(1)-O(7) bond length is 3.70 Å. There is one shorter (3.20 Å) and one longer (3.24 Å) Cs(1)-O(1) bond length. There is one shorter (3.13 Å) and one longer (3.28 Å) Cs(1)-O(3) bond length. There is one shorter (3.29 Å) and one longer (3.35 Å) Cs(1)-O(4) bond length. In the second Cs site, Cs(2) is bonded in a 12-coordinate geometry to one B(2), two equivalent B(1), one O(3), one O(5), two equivalent O(6), two equivalent O(7), and three equivalent O(2) atoms. The Cs(2)-B(2) bond length is 3.48 Å. There is one shorter (3.42 Å) and one longer (3.60 Å) Cs(2)-B(1) bond length. The Cs(2)-O(3) bond length is 3.46 Å. The Cs(2)-O(5) bond length is 3.58 Å. There is one shorter (3.02 Å) and one longer (3.54 Å) Cs(2)-O(6) bond length. There is one shorter (3.10 Å) and one longer (3.25 Å) Cs(2)-O(7) bond length. There are a spread of Cs(2)-O(2) bond distances ranging from 3.25-3.42 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form corner-sharing GaO4 tetrahedra. The Ga(1)-O(2) bond length is 1.88 Å. The Ga(1)-O(4) bond length is 1.86 Å. The Ga(1)-O(5) bond length is 1.86 Å. The Ga(1)-O(7) bond length is 1.84 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form corner-sharing GaO4 tetrahedra. The Ga(2)-O(1) bond length is 1.86 Å. The Ga(2)-O(3) bond length is 1.87 Å. The Ga(2)-O(6) bond length is 1.88 Å. The Ga(2)-O(7) bond length is 1.84 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to two equivalent Cs(2), one O(2), one O(3), and one O(4) atom. The B(1)-O(2) bond length is 1.39 Å. The B(1)-O(3) bond length is 1.39 Å. The B(1)-O(4) bond length is 1.38 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one Cs(2), one O(1), one O(5), and one O(6) atom. The B(2)-O(1) bond length is 1.39 Å. The B(2)-O(5) bond length is 1.38 Å. The B(2)-O(6) bond length is 1.39 Å. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a 2-coordinate geometry to one Cs(1), two equivalent Cs(2), one Ga(1), and one Ga(2) atom. In the second O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cs(1), one Ga(2), and one B(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to three equivalent Cs(2), one Ga(1), and one B(1) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cs(2), two equivalent Cs(1), one Ga(2), and one B(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Ga(1), and one B(1) atom. In the sixth O site, O(5) is bonded in a 2-coordinate geometry to one Cs(1), one Cs(2), one Ga(1), and one B(2) atom. In the seventh O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cs(1), two equivalent Cs(2), one Ga(2), and one B(2) atom.