DOI: 10.17188/1653055
title: Materials Data on RbNa8(GaAs2)3 by Materials Project

description: RbNa8(GaAs2)3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Rb1+ is bonded to six As3- atoms to form distorted RbAs6 pentagonal pyramids that share corners with two equivalent NaAs4 tetrahedra, edges with five NaAs4 tetrahedra, and faces with two equivalent RbAs6 pentagonal pyramids. There are a spread of Rb–As bond distances ranging from 3.61–3.75 Å. There are eight inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five As3- atoms. There are a spread of Na–As bond distances ranging from 3.01–3.37 Å. In the second Na1+ site, Na1+ is bonded to four As3- atoms to form NaAs4 tetrahedra that share corners with two equivalent RbAs6 pentagonal pyramids, corners with three NaAs4 tetrahedra, edges with three equivalent RbAs6 pentagonal pyramids, and edges with two equivalent NaAs4 tetrahedra. There are a spread of Na–As bond distances ranging from 3.02–3.17 Å. In the third Na1+ site, Na1+ is bonded to four As3- atoms to form NaAs4 tetrahedra that share corners with three NaAs4 tetrahedra and edges with two equivalent RbAs6 pentagonal pyramids. There are a spread of Na–As bond distances ranging from 3.00–3.11 Å. In the fourth Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five As3- atoms. There are a spread of Na–As bond distances ranging from 3.04–3.30 Å. In the fifth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six As3- atoms. There are a spread of Na–As bond distances ranging from 3.43–3.56 Å. In the sixth Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five As3- atoms. There are a spread of Na–As bond distances ranging from 3.00–3.38 Å. In the seventh Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five As3- atoms. There are a spread of Na–As bond distances ranging from 3.01–3.43 Å. In the eighth Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five As3- atoms. There are a spread of Na–As bond distances ranging from 3.05–3.38 Å. There are three inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded in a trigonal planar geometry to three As3- atoms. There are a spread of Ga–As bond distances ranging from 2.37–2.43 Å. In the second Ga3+ site, Ga3+ is bonded in a trigonal planar geometry to three As3- atoms. There are a spread of Ga–As bond distances ranging from 2.39–2.42 Å. In the third Ga3+ site, Ga3+ is bonded in a trigonal planar geometry to three As3- atoms. There are a spread of Ga–As bond distances ranging from 2.39–2.45 Å. There are six inequivalent As3- sites. In the first As3- site, As3- is bonded in a 9-coordinate geometry to two equivalent Rb1+, six Na1+, and one Ga3+ atom. In the second As3- site, As3- is bonded in a 3-coordinate geometry to two equivalent Rb1+, five Na1+, and two Ga3+ atoms. In the third As3- site, As3- is bonded in a 9-coordinate geometry to eight Na1+ and one Ga3+ atom. In the fourth As3- site, As3- is bonded in a 9-coordinate geometry to two equivalent Rb1+, six Na1+, and one Ga3+ atom. In the fifth As3- site, As3- is bonded in a 3-coordinate geometry to seven Na1+ and two Ga3+ atoms. In the sixth As3- site, As3- is bonded in a 3-coordinate geometry to seven Na1+ and two Ga3+ atoms.