DOI: 10.17188/1720612
title: Materials Data on Ca4Bi6O13 by Materials Project

description: Ca4Bi6O13 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted CaO7 pentagonal bipyramids that share corners with four equivalent CaO7 pentagonal bipyramids, a cornercorner with one BiO5 square pyramid, edges with two equivalent CaO7 pentagonal bipyramids, edges with two BiO5 square pyramids, and faces with two equivalent CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.39–2.55 Å. In the second Ca2+ site, Ca2+ is bonded to seven O2- atoms to form distorted CaO7 pentagonal bipyramids that share corners with four equivalent CaO7 pentagonal bipyramids, a cornercorner with one BiO5 square pyramid, edges with two equivalent CaO7 pentagonal bipyramids, edges with two BiO5 square pyramids, and faces with two equivalent CaO7 pentagonal bipyramids. There are a spread of Ca–O bond distances ranging from 2.39–2.55 Å. There are five inequivalent Bi3+ sites. In the first Bi3+ site, Bi3+ is bonded to five O2- atoms to form BiO5 square pyramids that share corners with two equivalent CaO7 pentagonal bipyramids and edges with four CaO7 pentagonal bipyramids. There are a spread of Bi–O bond distances ranging from 2.11–2.41 Å. In the second Bi3+ site, Bi3+ is bonded to five O2- atoms to form BiO5 square pyramids that share corners with two equivalent CaO7 pentagonal bipyramids and edges with four CaO7 pentagonal bipyramids. There are a spread of Bi–O bond distances ranging from 2.10–2.45 Å. In the third Bi3+ site, Bi3+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Bi–O bond distances ranging from 2.13–3.10 Å. In the fourth Bi3+ site, Bi3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Bi–O bond distances ranging from 2.14–2.84 Å. In the fifth Bi3+ site, Bi3+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of Bi–O bond distances ranging from 2.10–2.12 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded to four Ca2+ and one Bi3+ atom to form distorted OCa4Bi trigonal bipyramids that share corners with four equivalent OCa4Bi square pyramids, corners with two equivalent OCa2Bi2 trigonal pyramids, edges with two equivalent OCa4Bi trigonal bipyramids, and edges with four OCa2Bi2 trigonal pyramids. In the second O2- site, O2- is bonded to four Ca2+ and one Bi3+ atom to form distorted OCa4Bi trigonal bipyramids that share corners with two equivalent OCa2Bi2 trigonal pyramids, edges with two equivalent OCa4Bi square pyramids, edges with two equivalent OCa4Bi trigonal bipyramids, and edges with four OCa2Bi2 trigonal pyramids. In the third O2- site, O2- is bonded to four Ca2+ and one Bi3+ atom to form distorted OCa4Bi square pyramids that share corners with four equivalent OCa4Bi trigonal bipyramids, corners with two equivalent OCa2Bi2 trigonal pyramids, edges with two equivalent OCa4Bi trigonal bipyramids, and edges with four OCa2Bi2 trigonal pyramids. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to four Ca2+ and one Bi3+ atom. In the fifth O2- site, O2- is bonded to two Ca2+ and two Bi3+ atoms to form OCa2Bi2 trigonal pyramids that share a cornercorner with one OCa4Bi trigonal bipyramid, corners with four OCa2Bi2 trigonal pyramids, an edgeedge with one OCa4Bi square pyramid, and edges with two OCa4Bi trigonal bipyramids. In the sixth O2- site, O2- is bonded to two Ca2+ and two Bi3+ atoms to form OCa2Bi2 trigonal pyramids that share a cornercorner with one OCa4Bi square pyramid, a cornercorner with one OCa4Bi trigonal bipyramid, corners with four OCa2Bi2 trigonal pyramids, an edgeedge with one OCa4Bi square pyramid, and edges with two OCa4Bi trigonal bipyramids. In the seventh O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Bi3+ atoms. In the eighth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Ca2+ and three Bi3+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to four Bi3+ atoms.