Materials Data on YbP2H4NO7 by Materials Project

Abstract

NH4YbP2O7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of four ammonium molecules and one YbP2O7 framework. In the YbP2O7 framework, Yb3+ is bonded to six O2- atoms to form YbO6 octahedra that share corners with six PO4 tetrahedra. There are a spread of Yb–O bond distances ranging from 2.29–2.33 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent YbO6 octahedra and a cornercorner with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 23–51°. There is three shorter (1.53 Å) and one longer (1.63 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three equivalent YbO6 octahedra and a cornercorner with one PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 18–55°. There is three shorter (1.53 Å) and one longer (1.64 Å) P–O bond length. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Yb3+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Yb3+ and one P5+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Yb3+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Yb3+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted linear geometry to one Yb3+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Yb3+ and one P5+ atom.