DOI: 10.17188/1701668
title: Materials Data on U2B9O22 by Materials Project

description: (UO2)2(BO2)9 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of two pitchblend, uranium(iv) oxide, uranium(iv) dioxide, uranium dioxide molecules and one BO2 sheet oriented in the (0, 0, 1) direction. In the BO2 sheet, there are nine inequivalent B sites. In the first B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.41–1.50 Å. In the second B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.49 Å. In the third B site, B is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.37 Å) and two longer (1.38 Å) B–O bond length. In the fourth B site, B is bonded in a trigonal planar geometry to three O atoms. There is one shorter (1.37 Å) and two longer (1.38 Å) B–O bond length. In the fifth B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.49 Å. In the sixth B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.44–1.53 Å. In the seventh B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.48 Å. In the eighth B site, B is bonded to four O atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.47 Å. In the ninth B site, B is bonded in a trigonal planar geometry to three O atoms. There are a spread of B–O bond distances ranging from 1.34–1.39 Å. There are eighteen inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to two B atoms. In the second O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the third O site, O is bonded in a linear geometry to two B atoms. In the fourth O site, O is bonded in a bent 120 degrees geometry to two B atoms. In the fifth O site, O is bonded in a single-bond geometry to one B atom. In the sixth O site, O is bonded in a single-bond geometry to one B atom. In the seventh O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the eighth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the ninth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the tenth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the eleventh O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the twelfth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the thirteenth O site, O is bonded in a single-bond geometry to one B atom. In the fourteenth O site, O is bonded in a bent 120 degrees geometry to two B atoms. In the fifteenth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the sixteenth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the seventeenth O site, O is bonded in a distorted bent 120 degrees geometry to two B atoms. In the eighteenth O site, O is bonded in a distorted water-like geometry to two B atoms.