Materials Data on Ag2Te2O7 by Materials Project
Ag2Te2O7 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. there are two inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded to eight O2- atoms to form distorted AgO8 hexagonal bipyramids that share corners with two equivalent AgO8 hexagonal bipyramids, corners with two equivalent TeO6 octahedra, edges with four equivalent AgO8 hexagonal bipyramids, and edges with six TeO6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are a spread of Ag–O bond distances ranging from 2.33–2.87 Å. In the second Ag1+ site, Ag1+ is bonded to eight O2- atoms to form distorted AgO8 hexagonal bipyramids that share edges with six AgO8 hexagonal bipyramids and edges with six TeO6 octahedra. There are four shorter (2.53 Å) and four longer (2.84 Å) Ag–O bond lengths. There are two inequivalent Te6+ sites. In the first Te6+ site, Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with two equivalent AgO8 hexagonal bipyramids, corners with four equivalent TeO6 octahedra, and edges with six AgO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 42°. There is two shorter (1.91 Å) and four longer (2.03 Å) Te–O bond length. In the second Te6+ site, Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with six TeO6 octahedra and edges with six AgO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 41–42°. There is four shorter (1.96 Å) and two longer (1.98 Å) Te–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Ag1+ and two Te6+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ag1+ and two equivalent Te6+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ag1+ and one Te6+ atom.