DOI: 10.17188/1715728
title: Materials Data on Bi10Te2Br4O17 by Materials Project

description: Bi10Te2O17Br4 crystallizes in the orthorhombic Fmm2 space group. The structure is two-dimensional and consists of two Bi10Te2O17Br4 sheets oriented in the (0, 0, 1) direction. there are seven inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Bi–O bond distances ranging from 2.42–2.83 Å. In the second Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- atoms. All Bi–O bond lengths are 2.25 Å. In the third Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four equivalent Br1- atoms. All Bi–O bond lengths are 2.27 Å. All Bi–Br bond lengths are 3.40 Å. In the fourth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four equivalent Br1- atoms. All Bi–O bond lengths are 2.29 Å. All Bi–Br bond lengths are 3.50 Å. In the fifth Bi3+ site, Bi3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.44 Å) and four longer (2.53 Å) Bi–O bond lengths. In the sixth Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four equivalent Br1- atoms. All Bi–O bond lengths are 2.28 Å. All Bi–Br bond lengths are 3.40 Å. In the seventh Bi3+ site, Bi3+ is bonded in a 4-coordinate geometry to four O2- and four equivalent Br1- atoms. All Bi–O bond lengths are 2.29 Å. All Bi–Br bond lengths are 3.39 Å. There are two inequivalent Te4+ sites. In the first Te4+ site, Te4+ is bonded in a 4-coordinate geometry to four O2- and four equivalent Br1- atoms. There are two shorter (2.04 Å) and two longer (2.05 Å) Te–O bond lengths. All Te–Br bond lengths are 3.51 Å. In the second Te4+ site, Te4+ is bonded in a distorted square pyramidal geometry to five O2- atoms. There are a spread of Te–O bond distances ranging from 1.88–2.19 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the second O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Bi3+ and two Te4+ atoms. In the fourth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the fifth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Bi3+ and two Te4+ atoms. In the seventh O2- site, O2- is bonded in a single-bond geometry to four equivalent Bi3+ and one Te4+ atom. In the eighth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the ninth O2- site, O2- is bonded to four Bi3+ atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. There are two inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a 8-coordinate geometry to four Bi3+ atoms. In the second Br1- site, Br1- is bonded in a 6-coordinate geometry to four Bi3+ and two equivalent Te4+ atoms.