Gd2AsO5 crystallizes in the tetragonal P4/n space group. Gd(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), three equivalent O(1), and three equivalent O(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. In the second As site, As(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Gd(1) and one As(1) atom to form distorted OGd3As tetrahedra that share  a cornercorner with one O(3)Gd4 tetrahedra, corners with three equivalent O(1)Gd3As tetrahedra, corners with three equivalent O(4)Gd4 tetrahedra,  an edgeedge with one O(3)Gd4 tetrahedra, and edges with three equivalent O(1)Gd3As tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Gd(1) and one As(2) atom. In the third O site, O(3) is bonded to four equivalent Gd(1) atoms to form OGd4 tetrahedra that share corners with four equivalent O(1)Gd3As tetrahedra, edges with two equivalent O(4)Gd4 tetrahedra, and edges with four equivalent O(1)Gd3As tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Gd(1) atoms to form OGd4 tetrahedra that share corners with twelve equivalent O(1)Gd3As tetrahedra and edges with two equivalent O(3)Gd4 tetrahedra.
Gd2AsO5 crystallizes in the tetragonal P4/n space group. Gd(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), three equivalent O(1), and three equivalent O(2) atoms. The Gd(1)-O(3) bond length is 2.29 Å. The Gd(1)-O(4) bond length is 2.29 Å. There are a spread of Gd(1)-O(1) bond distances ranging from 2.43-2.57 Å. There are a spread of Gd(1)-O(2) bond distances ranging from 2.46-2.62 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a distorted square co-planar geometry to four equivalent O(1) atoms. All As(1)-O(1) bond lengths are 1.84 Å. In the second As site, As(2) is bonded in a distorted square co-planar geometry to four equivalent O(2) atoms. All As(2)-O(2) bond lengths are 1.83 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Gd(1) and one As(1) atom to form distorted OGd3As tetrahedra that share  a cornercorner with one O(3)Gd4 tetrahedra, corners with three equivalent O(1)Gd3As tetrahedra, corners with three equivalent O(4)Gd4 tetrahedra,  an edgeedge with one O(3)Gd4 tetrahedra, and edges with three equivalent O(1)Gd3As tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Gd(1) and one As(2) atom. In the third O site, O(3) is bonded to four equivalent Gd(1) atoms to form OGd4 tetrahedra that share corners with four equivalent O(1)Gd3As tetrahedra, edges with two equivalent O(4)Gd4 tetrahedra, and edges with four equivalent O(1)Gd3As tetrahedra. In the fourth O site, O(4) is bonded to four equivalent Gd(1) atoms to form OGd4 tetrahedra that share corners with twelve equivalent O(1)Gd3As tetrahedra and edges with two equivalent O(3)Gd4 tetrahedra.