Sr2GdGaO5 crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted q6 geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Gd(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Ga(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Gd(1), and one Ga(1) atom to form distorted OSr3Gd2Ga octahedra that share corners with four equivalent O(1)Sr3Gd2Ga octahedra, corners with four equivalent O(3)Sr4Gd2 octahedra, corners with six equivalent O(2)Sr4GdGa octahedra, edges with two equivalent O(1)Sr3Gd2Ga octahedra, edges with six equivalent O(2)Sr4GdGa octahedra, faces with two equivalent O(1)Sr3Gd2Ga octahedra, and faces with two equivalent O(3)Sr4Gd2 octahedra. The corner-sharing octahedral tilt angles range from 30-65°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Gd(1), and one Ga(1) atom to form distorted OSr4GdGa octahedra that share corners with four equivalent O(3)Sr4Gd2 octahedra, corners with four equivalent O(2)Sr4GdGa octahedra, corners with six equivalent O(1)Sr3Gd2Ga octahedra, edges with two equivalent O(2)Sr4GdGa octahedra, edges with six equivalent O(1)Sr3Gd2Ga octahedra, faces with two equivalent O(3)Sr4Gd2 octahedra, and faces with two equivalent O(2)Sr4GdGa octahedra. The corner-sharing octahedral tilt angles range from 30-65°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Gd(1) atoms to form OSr4Gd2 octahedra that share corners with six equivalent O(3)Sr4Gd2 octahedra, corners with eight equivalent O(1)Sr3Gd2Ga octahedra, corners with eight equivalent O(2)Sr4GdGa octahedra, faces with four equivalent O(1)Sr3Gd2Ga octahedra, and faces with four equivalent O(2)Sr4GdGa octahedra. The corner-sharing octahedral tilt angles range from 0-65°.
Sr2GdGaO5 crystallizes in the orthorhombic Fmmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted q6 geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(2) atoms. Both Sr(1)-O(3) bond lengths are 2.84 Å. All Sr(1)-O(1) bond lengths are 2.88 Å. All Sr(1)-O(2) bond lengths are 2.85 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both Sr(2)-O(1) bond lengths are 2.41 Å. Both Sr(2)-O(3) bond lengths are 2.50 Å. All Sr(2)-O(2) bond lengths are 2.74 Å. Gd(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Gd(1)-O(2) bond lengths are 2.27 Å. Both Gd(1)-O(3) bond lengths are 2.49 Å. All Gd(1)-O(1) bond lengths are 2.72 Å. Ga(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Ga(1)-O(1) bond lengths are 1.85 Å. Both Ga(1)-O(2) bond lengths are 1.88 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Gd(1), and one Ga(1) atom to form distorted OSr3Gd2Ga octahedra that share corners with four equivalent O(1)Sr3Gd2Ga octahedra, corners with four equivalent O(3)Sr4Gd2 octahedra, corners with six equivalent O(2)Sr4GdGa octahedra, edges with two equivalent O(1)Sr3Gd2Ga octahedra, edges with six equivalent O(2)Sr4GdGa octahedra, faces with two equivalent O(1)Sr3Gd2Ga octahedra, and faces with two equivalent O(3)Sr4Gd2 octahedra. The corner-sharing octahedral tilt angles range from 30-65°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Gd(1), and one Ga(1) atom to form distorted OSr4GdGa octahedra that share corners with four equivalent O(3)Sr4Gd2 octahedra, corners with four equivalent O(2)Sr4GdGa octahedra, corners with six equivalent O(1)Sr3Gd2Ga octahedra, edges with two equivalent O(2)Sr4GdGa octahedra, edges with six equivalent O(1)Sr3Gd2Ga octahedra, faces with two equivalent O(3)Sr4Gd2 octahedra, and faces with two equivalent O(2)Sr4GdGa octahedra. The corner-sharing octahedral tilt angles range from 30-65°. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Gd(1) atoms to form OSr4Gd2 octahedra that share corners with six equivalent O(3)Sr4Gd2 octahedra, corners with eight equivalent O(1)Sr3Gd2Ga octahedra, corners with eight equivalent O(2)Sr4GdGa octahedra, faces with four equivalent O(1)Sr3Gd2Ga octahedra, and faces with four equivalent O(2)Sr4GdGa octahedra. The corner-sharing octahedral tilt angles range from 0-65°.