Rb2LiNb2(TeO6)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to one O(5) and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one Li(1), one O(2), one O(6), two equivalent O(3), and two equivalent O(7) atoms. Li(1) is bonded in a 3-coordinate geometry to one Rb(2), one O(6), two equivalent O(4), and two equivalent O(7) atoms. Nb(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with two equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(1), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form TeO6 octahedra that share corners with two equivalent Te(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. In the second Te site, Te(2) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(7) atoms to form TeO6 octahedra that share corners with two equivalent Te(1)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-45°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Te(1) and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(2), one Nb(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Nb(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Te(1), and one Te(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Rb(2), one Li(1), and two equivalent Nb(1) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Rb(2), one Li(1), one Nb(1), and one Te(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Te(1) atom.
Rb2LiNb2(TeO6)2 crystallizes in the monoclinic Cm space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 3-coordinate geometry to one O(5) and two equivalent O(8) atoms. The Rb(1)-O(5) bond length is 2.99 Å. Both Rb(1)-O(8) bond lengths are 3.14 Å. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one Li(1), one O(2), one O(6), two equivalent O(3), and two equivalent O(7) atoms. The Rb(2)-Li(1) bond length is 3.16 Å. The Rb(2)-O(2) bond length is 2.83 Å. The Rb(2)-O(6) bond length is 3.18 Å. Both Rb(2)-O(3) bond lengths are 2.84 Å. Both Rb(2)-O(7) bond lengths are 3.27 Å. Li(1) is bonded in a 3-coordinate geometry to one Rb(2), one O(6), two equivalent O(4), and two equivalent O(7) atoms. The Li(1)-O(6) bond length is 1.97 Å. Both Li(1)-O(4) bond lengths are 2.56 Å. Both Li(1)-O(7) bond lengths are 2.05 Å. Nb(1) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with two equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. The Nb(1)-O(2) bond length is 1.97 Å. The Nb(1)-O(3) bond length is 1.99 Å. The Nb(1)-O(4) bond length is 2.06 Å. The Nb(1)-O(6) bond length is 2.02 Å. The Nb(1)-O(7) bond length is 2.09 Å. The Nb(1)-O(8) bond length is 1.95 Å. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(1), one O(5), two equivalent O(4), and two equivalent O(8) atoms to form TeO6 octahedra that share corners with two equivalent Te(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 38-46°. The Te(1)-O(1) bond length is 2.07 Å. The Te(1)-O(5) bond length is 2.07 Å. Both Te(1)-O(4) bond lengths are 2.01 Å. Both Te(1)-O(8) bond lengths are 2.06 Å. In the second Te site, Te(2) is bonded to one O(1), one O(5), two equivalent O(3), and two equivalent O(7) atoms to form TeO6 octahedra that share corners with two equivalent Te(1)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-45°. The Te(2)-O(1) bond length is 1.98 Å. The Te(2)-O(5) bond length is 1.96 Å. Both Te(2)-O(3) bond lengths are 1.95 Å. Both Te(2)-O(7) bond lengths are 1.96 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Te(1) and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(2) and two equivalent Nb(1) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(2), one Nb(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Nb(1), and one Te(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Te(1), and one Te(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Rb(2), one Li(1), and two equivalent Nb(1) atoms. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Rb(2), one Li(1), one Nb(1), and one Te(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Te(1) atom.