Materials Data on NaSm9Si6(SO12)2 by Materials Project

Abstract

NaSm9Si6(SO12)2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. Na1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Na–O bond distances ranging from 2.46–2.94 Å. There are five inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sm–O bond distances ranging from 2.36–2.74 Å. In the second Sm3+ site, Sm3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sm–O bond distances ranging from 2.36–2.76 Å. In the third Sm3+ site, Sm3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sm–O bond distances ranging from 2.35–2.81 Å. In the fourth Sm3+ site, Sm3+ is bonded in a 5-coordinate geometry to two S2- and five O2- atoms. There are one shorter (2.94 Å) and one longer (2.97 Å) Sm–S bond lengths. There are a spread of Sm–O bond distances ranging from 2.33–2.53 Å. In the fifth Sm3+ site, Sm3+ is bonded in a 5-coordinate geometry to two S2- and five O2- atoms. Both Sm–S bond lengths are 2.98 Å. There are a spread of Sm–O bond distances ranging from 2.31–2.50 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There is three shorter (1.64 Å) and one longer (1.66 Å) Si–O bond length. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 6-coordinate geometry to six Sm3+ and six O2- atoms. There are three shorter (3.11 Å) and three longer (3.23 Å) S–O bond lengths. In the second S2- site, S2- is bonded in a distorted octahedral geometry to six Sm3+ atoms. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Sm3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, two Sm3+, one Si4+, and one S2- atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Sm3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Sm3+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, two Sm3+, and one Si4+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+, one Sm3+, and one Si4+ atom. In the seventh O2- site, O2- is bonded in a 1-coordinate geometry to two Sm3+ and one Si4+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to three Sm3+, one Si4+, and one S2- atom.