K2NaTeO12 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(6), two equivalent O(1), and two equivalent O(8) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(7), and two equivalent O(8) atoms. Na(1) is bonded in a 6-coordinate geometry to one O(5), one O(9), two equivalent O(7), and two equivalent O(8) atoms. Te(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted edge-sharing TeO6 octahedra. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Na(1), and one O(6) atom. In the second O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1) and two equivalent O(2) atoms. In the third O site, O(1) is bonded to two equivalent K(1) and two equivalent Te(1) atoms to form edge-sharing OK2Te2 tetrahedra. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Te(1) and one O(9) atom. In the fifth O site, O(3) is bonded in a single-bond geometry to one Te(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one K(2) and one Te(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one Na(1) atom. In the eighth O site, O(6) is bonded in a trigonal non-coplanar geometry to one K(1) and two equivalent O(8) atoms. In the ninth O site, O(7) is bonded in a distorted T-shaped geometry to one K(2), one Na(1), and one O(7) atom.
K2NaTeO12 crystallizes in the monoclinic C2/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(6), two equivalent O(1), and two equivalent O(8) atoms. The K(1)-O(6) bond length is 2.85 Å. Both K(1)-O(1) bond lengths are 2.83 Å. Both K(1)-O(8) bond lengths are 3.28 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(7), and two equivalent O(8) atoms. The K(2)-O(4) bond length is 2.64 Å. The K(2)-O(5) bond length is 3.01 Å. Both K(2)-O(7) bond lengths are 2.98 Å. Both K(2)-O(8) bond lengths are 2.65 Å. Na(1) is bonded in a 6-coordinate geometry to one O(5), one O(9), two equivalent O(7), and two equivalent O(8) atoms. The Na(1)-O(5) bond length is 2.38 Å. The Na(1)-O(9) bond length is 2.54 Å. Both Na(1)-O(7) bond lengths are 2.71 Å. Both Na(1)-O(8) bond lengths are 2.59 Å. Te(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted edge-sharing TeO6 octahedra. The Te(1)-O(3) bond length is 1.82 Å. The Te(1)-O(4) bond length is 1.85 Å. Both Te(1)-O(1) bond lengths are 2.01 Å. Both Te(1)-O(2) bond lengths are 2.22 Å. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one K(2), one Na(1), and one O(6) atom. The O(8)-O(6) bond length is 1.36 Å. In the second O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1) and two equivalent O(2) atoms. Both O(9)-O(2) bond lengths are 1.41 Å. In the third O site, O(1) is bonded to two equivalent K(1) and two equivalent Te(1) atoms to form edge-sharing OK2Te2 tetrahedra. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Te(1) and one O(9) atom. In the fifth O site, O(3) is bonded in a single-bond geometry to one Te(1) atom. In the sixth O site, O(4) is bonded in a 2-coordinate geometry to one K(2) and one Te(1) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one Na(1) atom. In the eighth O site, O(6) is bonded in a trigonal non-coplanar geometry to one K(1) and two equivalent O(8) atoms. In the ninth O site, O(7) is bonded in a distorted T-shaped geometry to one K(2), one Na(1), and one O(7) atom. The O(7)-O(7) bond length is 1.26 Å.