Rb2Ga2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(2), one O(7), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(3), one O(7), and two equivalent O(5) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(5), one O(6), and one O(7) 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(5) 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 one O(1), one O(2), and one O(7) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Ga(1), and one B(2) atom. In the second O site, O(7) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Ga(1), and one B(1) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Ga(1), and one B(1) atom. In the fourth O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), one Ga(2), and one B(1) atom. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(2), one Ga(2), and one B(2) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Ga(2), and one B(2) atom. In the seventh O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Rb(2), one Ga(1), and one Ga(2) atom.
Rb2Ga2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(2), one O(7), two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms. The Rb(1)-O(2) bond length is 2.76 Å. The Rb(1)-O(7) bond length is 3.45 Å. There is one shorter (3.03 Å) and one longer (3.09 Å) Rb(1)-O(1) bond length. There is one shorter (3.07 Å) and one longer (3.17 Å) Rb(1)-O(4) bond length. There is one shorter (2.98 Å) and one longer (3.02 Å) Rb(1)-O(6) bond length. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one O(3), one O(7), and two equivalent O(5) atoms. The Rb(2)-O(3) bond length is 3.08 Å. The Rb(2)-O(7) bond length is 2.88 Å. There is one shorter (2.96 Å) and one longer (3.06 Å) Rb(2)-O(5) bond length. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing GaO4 tetrahedra. The Ga(1)-O(1) bond length is 1.86 Å. The Ga(1)-O(5) bond length is 1.83 Å. The Ga(1)-O(6) bond length is 1.87 Å. The Ga(1)-O(7) bond length is 1.87 Å. In the second Ga site, Ga(2) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form corner-sharing GaO4 tetrahedra. The Ga(2)-O(2) bond length is 1.86 Å. The Ga(2)-O(3) bond length is 1.87 Å. The Ga(2)-O(4) bond length is 1.86 Å. The Ga(2)-O(5) bond length is 1.83 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(7) atom. The B(1)-O(1) bond length is 1.39 Å. The B(1)-O(2) bond length is 1.39 Å. The B(1)-O(7) bond length is 1.38 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(6) atom. The B(2)-O(3) bond length is 1.38 Å. The B(2)-O(4) 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(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Ga(1), and one B(2) atom. In the second O site, O(7) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Ga(1), and one B(1) atom. In the third O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Ga(1), and one B(1) atom. In the fourth O site, O(2) is bonded in a 2-coordinate geometry to one Rb(1), one Ga(2), and one B(1) atom. In the fifth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(2), one Ga(2), and one B(2) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Ga(2), and one B(2) atom. In the seventh O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Rb(2), one Ga(1), and one Ga(2) atom.