Materials Data on MgTe(PbO3)2 by Materials Project

Abstract

Pb2MgTeO6 is (Cubic) Perovskite-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with six equivalent TeO6 octahedra and faces with eight PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–6°. There are a spread of Mg–O bond distances ranging from 2.07–2.13 Å. There are two inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded to twelve O2- atoms to form PbO12 cuboctahedra that share corners with twelve equivalent PbO12 cuboctahedra, faces with six equivalent PbO12 cuboctahedra, faces with four equivalent MgO6 octahedra, and faces with four equivalent TeO6 octahedra. There are a spread of Pb–O bond distances ranging from 2.70–3.03 Å. In the second Pb2+ site, Pb2+ is bonded to twelve O2- atoms to form PbO12 cuboctahedra that share corners with twelve equivalent PbO12 cuboctahedra, faces with six equivalent PbO12 cuboctahedra, faces with four equivalent MgO6 octahedra, and faces with four equivalent TeO6 octahedra. There are a spread of Pb–O bond distances ranging from 2.70–3.01 Å. Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with six equivalent MgO6 octahedra and faces with eight PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–6°. There is three shorter (1.94 Å) and three longer (1.95 Å) Te–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom. In the second O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom. In the third O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom. In the fourth O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom. In the fifth O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom. In the sixth O2- site, O2- is bonded in a distorted linear geometry to one Mg2+, four Pb2+, and one Te6+ atom.