Gd2W4O15 crystallizes in the monoclinic P2_1/c space group. Gd(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form GdO7 pentagonal bipyramids that share corners with four equivalent W(1)O4 tetrahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form WO4 tetrahedra that share corners with four equivalent Gd(1)O7 pentagonal bipyramids. In the second W site, W(2) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Gd(1) and one W(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Gd(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent W(2) atoms.
Gd2W4O15 crystallizes in the monoclinic P2_1/c space group. Gd(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form GdO7 pentagonal bipyramids that share corners with four equivalent W(1)O4 tetrahedra. The Gd(1)-O(1) bond length is 2.32 Å. The Gd(1)-O(2) bond length is 2.40 Å. The Gd(1)-O(3) bond length is 2.32 Å. The Gd(1)-O(4) bond length is 2.35 Å. The Gd(1)-O(5) bond length is 2.42 Å. The Gd(1)-O(6) bond length is 2.34 Å. The Gd(1)-O(7) bond length is 2.39 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form WO4 tetrahedra that share corners with four equivalent Gd(1)O7 pentagonal bipyramids. The W(1)-O(1) bond length is 1.80 Å. The W(1)-O(3) bond length is 1.81 Å. The W(1)-O(4) bond length is 1.81 Å. The W(1)-O(5) bond length is 1.84 Å. In the second W site, W(2) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(7), and one O(8) atom. The W(2)-O(2) bond length is 1.80 Å. The W(2)-O(5) bond length is 2.47 Å. The W(2)-O(6) bond length is 1.80 Å. The W(2)-O(7) bond length is 1.80 Å. The W(2)-O(8) bond length is 1.91 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Gd(1) and one W(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Gd(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Gd(1) and one W(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to two equivalent W(2) atoms.