DOE OSTI2020
La12Sn5S28 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.92–3.21 Å. In the second La3+ site, La3+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of La–S bond distances ranging from 2.84–3.14 Å. In the third La3+ site, La3+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of La–S bond distances ranging from 2.82–3.13 Å. In the fourth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.92–3.20 Å. In the fifth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.90–3.21 Å. In the sixth La3+ site, La3+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of La–S bond distances ranging from 2.82–3.12 Å. In the seventh La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.82–3.23 Å. In the eighth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.93–3.37 Å. In the ninth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.94–3.37 Å. In the tenth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.81–3.23 Å. In the eleventh La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.82–3.22 Å. In the twelfth La3+ site, La3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of La–S bond distances ranging from 2.93–3.37 Å. There are five inequivalent Sn4+ sites. In the first Sn4+ site, Sn4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.38–2.43 Å. In the second Sn4+ site, Sn4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.37–2.44 Å. In the third Sn4+ site, Sn4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.37–2.43 Å. In the fourth Sn4+ site, Sn4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Sn–S bond distances ranging from 2.36–2.44 Å. In the fifth Sn4+ site, Sn4+ is bonded in an octahedral geometry to six S2- atoms. There are a spread of Sn–S bond distances ranging from 2.58–2.62 Å. There are twenty-eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Sn4+ atom. In the second S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the fourth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Sn4+ atom. In the fifth S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the sixth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Sn4+ atom. In the seventh S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the eighth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the ninth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the tenth S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the eleventh S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the twelfth S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the thirteenth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the fourteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the fifteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the sixteenth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the seventeenth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the eighteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the nineteenth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Sn4+ atom. In the twentieth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the twenty-first S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the twenty-second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the twenty-third S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the twenty-fourth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Sn4+ atom. In the twenty-fifth S2- site, S2- is bonded in a distorted tetrahedral geometry to three La3+ and one Sn4+ atom. In the twenty-sixth S2- site, S2- is bonded in a tetrahedral geometry to three La3+ and one Sn4+ atom. In the twenty-seventh S2- site, S2- is bonded in a tetrahedral geometry to three La3+ and one Sn4+ atom. In the twenty-eighth S2- site, S2- is bonded in a tetrahedral geometry to three La3+ and one Sn4+ atom.