RbDy2Ag3Te5 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent Te(2), two equivalent Te(3), and four equivalent Te(1) atoms. Dy(1) is bonded to one Te(3), two equivalent Te(1), and three equivalent Te(2) atoms to form distorted DyTe6 octahedra that share  a cornercorner with one Dy(1)Te6 octahedra, corners with four equivalent Ag(2)Te4 tetrahedra, edges with four equivalent Dy(1)Te6 octahedra, edges with two equivalent Ag(1)Te4 tetrahedra, and edges with three equivalent Ag(2)Te4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Te(1) and two equivalent Te(3) atoms to form distorted AgTe4 tetrahedra that share corners with two equivalent Ag(1)Te4 tetrahedra, corners with four equivalent Ag(2)Te4 tetrahedra, and edges with four equivalent Dy(1)Te6 octahedra. In the second Ag site, Ag(2) is bonded to two equivalent Te(1) and two equivalent Te(2) atoms to form distorted AgTe4 tetrahedra that share corners with four equivalent Dy(1)Te6 octahedra, corners with two equivalent Ag(1)Te4 tetrahedra, corners with two equivalent Ag(2)Te4 tetrahedra, edges with three equivalent Dy(1)Te6 octahedra, and  an edgeedge with one Ag(2)Te4 tetrahedra. The corner-sharing octahedral tilt angles range from 12-63°. There are three inequivalent Te sites. In the first Te site, Te(3) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Dy(1), and two equivalent Ag(1) atoms. In the second Te site, Te(1) is bonded to two equivalent Rb(1), two equivalent Dy(1), one Ag(1), and two equivalent Ag(2) atoms to form distorted TeRb2Dy2Ag3 pentagonal bipyramids that share corners with four equivalent Te(2)RbDy3Ag2 octahedra, corners with two equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, edges with five equivalent Te(2)RbDy3Ag2 octahedra, edges with three equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, and  a faceface with one Te(1)Rb2Dy2Ag3 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 2-37°. In the third Te site, Te(2) is bonded to one Rb(1), three equivalent Dy(1), and two equivalent Ag(2) atoms to form distorted TeRbDy3Ag2 octahedra that share  a cornercorner with one Te(2)RbDy3Ag2 octahedra, corners with four equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, edges with four equivalent Te(2)RbDy3Ag2 octahedra, and edges with five equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 61°.
RbDy2Ag3Te5 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent Te(2), two equivalent Te(3), and four equivalent Te(1) atoms. Both Rb(1)-Te(2) bond lengths are 3.83 Å. Both Rb(1)-Te(3) bond lengths are 3.75 Å. All Rb(1)-Te(1) bond lengths are 3.84 Å. Dy(1) is bonded to one Te(3), two equivalent Te(1), and three equivalent Te(2) atoms to form distorted DyTe6 octahedra that share  a cornercorner with one Dy(1)Te6 octahedra, corners with four equivalent Ag(2)Te4 tetrahedra, edges with four equivalent Dy(1)Te6 octahedra, edges with two equivalent Ag(1)Te4 tetrahedra, and edges with three equivalent Ag(2)Te4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. The Dy(1)-Te(3) bond length is 3.09 Å. Both Dy(1)-Te(1) bond lengths are 3.14 Å. There is one shorter (3.09 Å) and two longer (3.17 Å) Dy(1)-Te(2) bond lengths. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to two equivalent Te(1) and two equivalent Te(3) atoms to form distorted AgTe4 tetrahedra that share corners with two equivalent Ag(1)Te4 tetrahedra, corners with four equivalent Ag(2)Te4 tetrahedra, and edges with four equivalent Dy(1)Te6 octahedra. Both Ag(1)-Te(1) bond lengths are 2.89 Å. Both Ag(1)-Te(3) bond lengths are 2.78 Å. In the second Ag site, Ag(2) is bonded to two equivalent Te(1) and two equivalent Te(2) atoms to form distorted AgTe4 tetrahedra that share corners with four equivalent Dy(1)Te6 octahedra, corners with two equivalent Ag(1)Te4 tetrahedra, corners with two equivalent Ag(2)Te4 tetrahedra, edges with three equivalent Dy(1)Te6 octahedra, and  an edgeedge with one Ag(2)Te4 tetrahedra. The corner-sharing octahedral tilt angles range from 12-63°. There is one shorter (2.86 Å) and one longer (2.92 Å) Ag(2)-Te(1) bond length. Both Ag(2)-Te(2) bond lengths are 2.84 Å. There are three inequivalent Te sites. In the first Te site, Te(3) is bonded in a 6-coordinate geometry to two equivalent Rb(1), two equivalent Dy(1), and two equivalent Ag(1) atoms. In the second Te site, Te(1) is bonded to two equivalent Rb(1), two equivalent Dy(1), one Ag(1), and two equivalent Ag(2) atoms to form distorted TeRb2Dy2Ag3 pentagonal bipyramids that share corners with four equivalent Te(2)RbDy3Ag2 octahedra, corners with two equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, edges with five equivalent Te(2)RbDy3Ag2 octahedra, edges with three equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, and  a faceface with one Te(1)Rb2Dy2Ag3 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 2-37°. In the third Te site, Te(2) is bonded to one Rb(1), three equivalent Dy(1), and two equivalent Ag(2) atoms to form distorted TeRbDy3Ag2 octahedra that share  a cornercorner with one Te(2)RbDy3Ag2 octahedra, corners with four equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids, edges with four equivalent Te(2)RbDy3Ag2 octahedra, and edges with five equivalent Te(1)Rb2Dy2Ag3 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 61°.