TbAgZnAs2 crystallizes in the trigonal P3m1 space group. Tb(1) is bonded to three equivalent Ag(1), three equivalent As(1), and three equivalent As(2) atoms to form TbAg3As6 octahedra that share corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, corners with six equivalent Zn(1)Ag3As4 tetrahedra, edges with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, edges with three equivalent Zn(1)Ag3As4 tetrahedra, faces with six equivalent Tb(1)Ag3As6 octahedra, and faces with three equivalent Zn(1)Ag3As4 tetrahedra. Ag(1) is bonded in a 10-coordinate geometry to three equivalent Tb(1), three equivalent Zn(1), one As(1), and three equivalent As(2) atoms. Zn(1) is bonded to three equivalent Ag(1), one As(2), and three equivalent As(1) atoms to form distorted ZnAg3As4 tetrahedra that share corners with six equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, edges with three equivalent Tb(1)Ag3As6 octahedra, edges with six equivalent Zn(1)Ag3As4 tetrahedra, faces with three equivalent Tb(1)Ag3As6 octahedra, and  a faceface with one As(2)Tb3ZnAg3 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 9-15°. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Tb(1), one Ag(1), and three equivalent Zn(1) atoms to form distorted AsTb3Zn3Ag pentagonal bipyramids that share corners with three equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, corners with three equivalent Zn(1)Ag3As4 tetrahedra, edges with six equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, and edges with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. In the second As site, As(2) is bonded to three equivalent Tb(1), three equivalent Ag(1), and one Zn(1) atom to form distorted AsTb3ZnAg3 pentagonal bipyramids that share corners with three equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with six equivalent Zn(1)Ag3As4 tetrahedra, edges with three equivalent Tb(1)Ag3As6 octahedra, edges with six equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, edges with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, and  a faceface with one Zn(1)Ag3As4 tetrahedra. The corner-sharing octahedral tilt angles are 65°.
TbAgZnAs2 crystallizes in the trigonal P3m1 space group. Tb(1) is bonded to three equivalent Ag(1), three equivalent As(1), and three equivalent As(2) atoms to form TbAg3As6 octahedra that share corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, corners with six equivalent Zn(1)Ag3As4 tetrahedra, edges with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, edges with three equivalent Zn(1)Ag3As4 tetrahedra, faces with six equivalent Tb(1)Ag3As6 octahedra, and faces with three equivalent Zn(1)Ag3As4 tetrahedra. All Tb(1)-Ag(1) bond lengths are 3.45 Å. All Tb(1)-As(1) bond lengths are 3.03 Å. All Tb(1)-As(2) bond lengths are 2.89 Å. Ag(1) is bonded in a 10-coordinate geometry to three equivalent Tb(1), three equivalent Zn(1), one As(1), and three equivalent As(2) atoms. All Ag(1)-Zn(1) bond lengths are 3.03 Å. The Ag(1)-As(1) bond length is 2.71 Å. All Ag(1)-As(2) bond lengths are 2.62 Å. Zn(1) is bonded to three equivalent Ag(1), one As(2), and three equivalent As(1) atoms to form distorted ZnAg3As4 tetrahedra that share corners with six equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, edges with three equivalent Tb(1)Ag3As6 octahedra, edges with six equivalent Zn(1)Ag3As4 tetrahedra, faces with three equivalent Tb(1)Ag3As6 octahedra, and  a faceface with one As(2)Tb3ZnAg3 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 9-15°. The Zn(1)-As(2) bond length is 2.68 Å. All Zn(1)-As(1) bond lengths are 2.64 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Tb(1), one Ag(1), and three equivalent Zn(1) atoms to form distorted AsTb3Zn3Ag pentagonal bipyramids that share corners with three equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, corners with three equivalent Zn(1)Ag3As4 tetrahedra, edges with six equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, and edges with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 46°. In the second As site, As(2) is bonded to three equivalent Tb(1), three equivalent Ag(1), and one Zn(1) atom to form distorted AsTb3ZnAg3 pentagonal bipyramids that share corners with three equivalent Tb(1)Ag3As6 octahedra, corners with three equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, corners with six equivalent Zn(1)Ag3As4 tetrahedra, edges with three equivalent Tb(1)Ag3As6 octahedra, edges with six equivalent As(1)Tb3Zn3Ag pentagonal bipyramids, edges with six equivalent As(2)Tb3ZnAg3 pentagonal bipyramids, and  a faceface with one Zn(1)Ag3As4 tetrahedra. The corner-sharing octahedral tilt angles are 65°.