Pb2TeO5 crystallizes in the monoclinic Cc space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. Te(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 43°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Pb(2), two equivalent Pb(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Pb(1), one Pb(2), and one Te(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pb(1), two equivalent Pb(2), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Pb(1), one Pb(2), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Te(1) atoms.
Pb2TeO5 crystallizes in the monoclinic Cc space group. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. The Pb(1)-O(2) bond length is 2.42 Å. The Pb(1)-O(3) bond length is 2.67 Å. The Pb(1)-O(4) bond length is 2.57 Å. There is one shorter (2.41 Å) and one longer (2.61 Å) Pb(1)-O(1) bond length. In the second Pb site, Pb(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. The Pb(2)-O(1) bond length is 2.70 Å. The Pb(2)-O(2) bond length is 2.56 Å. The Pb(2)-O(4) bond length is 2.39 Å. There is one shorter (2.41 Å) and one longer (2.63 Å) Pb(2)-O(3) bond length. Te(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 43°. The Te(1)-O(1) bond length is 1.94 Å. The Te(1)-O(2) bond length is 1.95 Å. The Te(1)-O(3) bond length is 1.93 Å. The Te(1)-O(4) bond length is 1.95 Å. There is one shorter (2.05 Å) and one longer (2.06 Å) Te(1)-O(5) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Pb(2), two equivalent Pb(1), and one Te(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Pb(1), one Pb(2), and one Te(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pb(1), two equivalent Pb(2), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Pb(1), one Pb(2), and one Te(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Te(1) atoms.