K2CeAg3Te4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Ag(2), two equivalent Te(1), two equivalent Te(2), and three equivalent Te(3) atoms. In the second K site, K(2) is bonded in a 12-coordinate geometry to one Ag(3), two equivalent Ag(2), three equivalent Ag(1), two equivalent Te(1), two equivalent Te(2), and two equivalent Te(4) atoms. Ce(1) is bonded to two equivalent Ag(1), two equivalent Ag(2), one Te(3), one Te(4), two equivalent Te(1), and two equivalent Te(2) atoms to form distorted CeAg4Te6 octahedra that share corners with two equivalent Te(2)K4Ce2Ag pentagonal bipyramids and faces with two equivalent Ce(1)Ag4Te6 octahedra. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 12-coordinate geometry to three equivalent K(2), two equivalent Ce(1), one Ag(3), two equivalent Ag(1), one Te(2), and three equivalent Te(4) atoms. In the second Ag site, Ag(2) is bonded in a 11-coordinate geometry to one K(1), two equivalent K(2), two equivalent Ce(1), two equivalent Ag(3), one Te(1), one Te(4), and two equivalent Te(3) atoms. In the third Ag site, Ag(3) is bonded in a 5-coordinate geometry to one K(2), one Ag(1), two equivalent Ag(2), one Te(1), one Te(3), and two equivalent Te(4) atoms. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent K(2), two equivalent Ce(1), one Ag(2), and one Ag(3) atom. In the second Te site, Te(2) is bonded to two equivalent K(1), two equivalent K(2), two equivalent Ce(1), and one Ag(1) atom to form distorted TeK4Ce2Ag pentagonal bipyramids that share corners with two equivalent Ce(1)Ag4Te6 octahedra and faces with two equivalent Te(2)K4Ce2Ag pentagonal bipyramids. The corner-sharing octahedral tilt angles are 126°. In the third Te site, Te(3) is bonded in a 7-coordinate geometry to three equivalent K(1), one Ce(1), one Ag(3), and two equivalent Ag(2) atoms. In the fourth Te site, Te(4) is bonded in a 9-coordinate geometry to two equivalent K(2), one Ce(1), one Ag(2), two equivalent Ag(3), and three equivalent Ag(1) atoms.
K2CeAg3Te4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Ag(2), two equivalent Te(1), two equivalent Te(2), and three equivalent Te(3) atoms. The K(1)-Ag(2) bond length is 3.94 Å. Both K(1)-Te(1) bond lengths are 3.93 Å. Both K(1)-Te(2) bond lengths are 3.72 Å. There are two shorter (3.57 Å) and one longer (3.86 Å) K(1)-Te(3) bond length. In the second K site, K(2) is bonded in a 12-coordinate geometry to one Ag(3), two equivalent Ag(2), three equivalent Ag(1), two equivalent Te(1), two equivalent Te(2), and two equivalent Te(4) atoms. The K(2)-Ag(3) bond length is 3.69 Å. Both K(2)-Ag(2) bond lengths are 3.76 Å. There are two shorter (3.72 Å) and one longer (3.79 Å) K(2)-Ag(1) bond length. Both K(2)-Te(1) bond lengths are 3.57 Å. Both K(2)-Te(2) bond lengths are 3.61 Å. Both K(2)-Te(4) bond lengths are 3.55 Å. Ce(1) is bonded to two equivalent Ag(1), two equivalent Ag(2), one Te(3), one Te(4), two equivalent Te(1), and two equivalent Te(2) atoms to form distorted CeAg4Te6 octahedra that share corners with two equivalent Te(2)K4Ce2Ag pentagonal bipyramids and faces with two equivalent Ce(1)Ag4Te6 octahedra. Both Ce(1)-Ag(1) bond lengths are 3.90 Å. Both Ce(1)-Ag(2) bond lengths are 3.83 Å. The Ce(1)-Te(3) bond length is 3.27 Å. The Ce(1)-Te(4) bond length is 3.31 Å. Both Ce(1)-Te(1) bond lengths are 3.25 Å. Both Ce(1)-Te(2) bond lengths are 3.20 Å. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 12-coordinate geometry to three equivalent K(2), two equivalent Ce(1), one Ag(3), two equivalent Ag(1), one Te(2), and three equivalent Te(4) atoms. The Ag(1)-Ag(3) bond length is 3.40 Å. Both Ag(1)-Ag(1) bond lengths are 3.38 Å. The Ag(1)-Te(2) bond length is 2.80 Å. There are two shorter (2.95 Å) and one longer (3.02 Å) Ag(1)-Te(4) bond length. In the second Ag site, Ag(2) is bonded in a 11-coordinate geometry to one K(1), two equivalent K(2), two equivalent Ce(1), two equivalent Ag(3), one Te(1), one Te(4), and two equivalent Te(3) atoms. Both Ag(2)-Ag(3) bond lengths are 3.37 Å. The Ag(2)-Te(1) bond length is 2.91 Å. The Ag(2)-Te(4) bond length is 3.19 Å. Both Ag(2)-Te(3) bond lengths are 2.82 Å. In the third Ag site, Ag(3) is bonded in a 5-coordinate geometry to one K(2), one Ag(1), two equivalent Ag(2), one Te(1), one Te(3), and two equivalent Te(4) atoms. The Ag(3)-Te(1) bond length is 2.84 Å. The Ag(3)-Te(3) bond length is 2.88 Å. Both Ag(3)-Te(4) bond lengths are 2.98 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent K(2), two equivalent Ce(1), one Ag(2), and one Ag(3) atom. In the second Te site, Te(2) is bonded to two equivalent K(1), two equivalent K(2), two equivalent Ce(1), and one Ag(1) atom to form distorted TeK4Ce2Ag pentagonal bipyramids that share corners with two equivalent Ce(1)Ag4Te6 octahedra and faces with two equivalent Te(2)K4Ce2Ag pentagonal bipyramids. The corner-sharing octahedral tilt angles are 126°. In the third Te site, Te(3) is bonded in a 7-coordinate geometry to three equivalent K(1), one Ce(1), one Ag(3), and two equivalent Ag(2) atoms. In the fourth Te site, Te(4) is bonded in a 9-coordinate geometry to two equivalent K(2), one Ce(1), one Ag(2), two equivalent Ag(3), and three equivalent Ag(1) atoms.