Rb6Te2O9 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to two equivalent O(4), three equivalent O(1), and three equivalent O(3) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(2), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a trigonal bipyramidal geometry to one O(5), two equivalent O(3), and two equivalent O(4) atoms. In the second Te site, Te(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Rb(2), one Rb(3), three equivalent Rb(1), and one Te(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Te(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), three equivalent Rb(1), and one Te(1) atom. In the fourth O site, O(4) is bonded to one Rb(3), two equivalent Rb(1), two equivalent Rb(2), and one Te(1) atom to form a mixture of distorted edge and corner-sharing ORb5Te octahedra. The corner-sharing octahedral tilt angles are 2°. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Te(1) atom.
Rb6Te2O9 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to two equivalent O(4), three equivalent O(1), and three equivalent O(3) atoms. There is one shorter (2.91 Å) and one longer (2.98 Å) Rb(1)-O(4) bond length. There are a spread of Rb(1)-O(1) bond distances ranging from 3.21-3.47 Å. There are a spread of Rb(1)-O(3) bond distances ranging from 2.89-3.28 Å. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(2), and two equivalent O(4) atoms. The Rb(2)-O(1) bond length is 3.08 Å. The Rb(2)-O(3) bond length is 2.83 Å. The Rb(2)-O(5) bond length is 2.76 Å. There is one shorter (2.93 Å) and one longer (3.03 Å) Rb(2)-O(2) bond length. There is one shorter (2.88 Å) and one longer (2.91 Å) Rb(2)-O(4) bond length. In the third Rb site, Rb(3) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and two equivalent O(2) atoms. The Rb(3)-O(1) bond length is 2.84 Å. The Rb(3)-O(3) bond length is 2.73 Å. The Rb(3)-O(4) bond length is 2.84 Å. The Rb(3)-O(5) bond length is 2.96 Å. There is one shorter (3.10 Å) and one longer (3.44 Å) Rb(3)-O(2) bond length. There are two inequivalent Te sites. In the first Te site, Te(1) is bonded in a trigonal bipyramidal geometry to one O(5), two equivalent O(3), and two equivalent O(4) atoms. The Te(1)-O(5) bond length is 1.89 Å. Both Te(1)-O(3) bond lengths are 1.88 Å. Both Te(1)-O(4) bond lengths are 1.93 Å. In the second Te site, Te(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Te(2)-O(1) bond lengths are 1.83 Å. Both Te(2)-O(2) bond lengths are 1.83 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Rb(2), one Rb(3), three equivalent Rb(1), and one Te(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Te(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(2), one Rb(3), three equivalent Rb(1), and one Te(1) atom. In the fourth O site, O(4) is bonded to one Rb(3), two equivalent Rb(1), two equivalent Rb(2), and one Te(1) atom to form a mixture of distorted edge and corner-sharing ORb5Te octahedra. The corner-sharing octahedral tilt angles are 2°. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Te(1) atom.