DOI: 10.17188/1278097
title: Materials Data on U2(P2O7)3 by Materials Project

description: U2(P2O7)3 crystallizes in the monoclinic Cc space group. The structure is two-dimensional and consists of two U2(P2O7)3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent U6+ sites. In the first U6+ site, U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share corners with two equivalent PO4 tetrahedra. There are a spread of U–O bond distances ranging from 2.10–2.34 Å. In the second U6+ site, U6+ is bonded to seven O2- atoms to form distorted UO7 pentagonal bipyramids that share a cornercorner with one PO4 tetrahedra. There are a spread of U–O bond distances ranging from 1.80–2.49 Å. There are six inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent UO7 pentagonal bipyramids. There are a spread of P–O bond distances ranging from 1.49–1.72 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one UO7 pentagonal bipyramid. There are a spread of P–O bond distances ranging from 1.48–1.63 Å. In the third P5+ site, P5+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.46–1.56 Å. In the fourth P5+ site, P5+ is bonded in a water-like geometry to two O2- atoms. There is one shorter (1.54 Å) and one longer (1.86 Å) P–O bond length. In the fifth P5+ site, P5+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.51–1.69 Å. In the sixth P5+ site, P5+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.46 Å) and two longer (1.51 Å) P–O bond length. There are twenty-one inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one P5+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one U6+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one U6+ and one O2- atom. The O–O bond length is 1.43 Å. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one U6+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the seventh O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to one U6+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to one U6+ and one O2- atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to one U6+ and one O2- atom. The O–O bond length is 1.45 Å. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to one U6+ and one O2- atom. In the twelfth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two P5+ atoms. In the thirteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one U6+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the fifteenth O2- site, O2- is bonded in a distorted linear geometry to one U6+ and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one P5+ atom. In the seventeenth O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the eighteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the twentieth O2- site, O2- is bonded in a bent 150 degrees geometry to one U6+ and one P5+ atom. In the twenty-first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one U6+ and one P5+ atom.