DOE OSTI2020
K9(Mo6S7)8 is alpha Pu-derived structured and crystallizes in the trigonal P-3 space group. The structure is three-dimensional. there are five inequivalent K sites. In the first K site, K is bonded in a 6-coordinate geometry to nine S atoms. There are a spread of K–S bond distances ranging from 3.51–3.76 Å. In the second K site, K is bonded in a 4-coordinate geometry to four S atoms. There are one shorter (2.65 Å) and three longer (2.74 Å) K–S bond lengths. In the third K site, K is bonded in a distorted linear geometry to eight S atoms. There are a spread of K–S bond distances ranging from 2.88–3.77 Å. In the fourth K site, K is bonded in a 9-coordinate geometry to nine S atoms. There are six shorter (3.38 Å) and three longer (3.53 Å) K–S bond lengths. In the fifth K site, K is bonded in a hexagonal planar geometry to six equivalent S atoms. All K–S bond lengths are 3.54 Å. There are eight inequivalent Mo sites. In the first Mo site, Mo is bonded in a 3-coordinate geometry to three S atoms. There are a spread of Mo–S bond distances ranging from 2.34–2.55 Å. In the second Mo site, Mo is bonded in a 5-coordinate geometry to five S atoms. There are a spread of Mo–S bond distances ranging from 2.36–2.70 Å. In the third Mo site, Mo is bonded in a 5-coordinate geometry to four S atoms. There are a spread of Mo–S bond distances ranging from 2.39–2.92 Å. In the fourth Mo site, Mo is bonded in a 4-coordinate geometry to six S atoms. There are a spread of Mo–S bond distances ranging from 2.34–2.97 Å. In the fifth Mo site, Mo is bonded in a 4-coordinate geometry to four S atoms. There are a spread of Mo–S bond distances ranging from 2.42–2.56 Å. In the sixth Mo site, Mo is bonded in a 2-coordinate geometry to six S atoms. There are a spread of Mo–S bond distances ranging from 2.44–3.11 Å. In the seventh Mo site, Mo is bonded in a 4-coordinate geometry to four S atoms. There are a spread of Mo–S bond distances ranging from 2.34–2.47 Å. In the eighth Mo site, Mo is bonded to four S atoms to form distorted corner-sharing MoS4 trigonal pyramids. There are a spread of Mo–S bond distances ranging from 2.40–2.57 Å. There are twelve inequivalent S sites. In the first S site, S is bonded in a 5-coordinate geometry to one K and four Mo atoms. In the second S site, S is bonded in a 6-coordinate geometry to two K and four Mo atoms. In the third S site, S is bonded in a 4-coordinate geometry to one K and three Mo atoms. In the fourth S site, S is bonded in a 4-coordinate geometry to two equivalent K and three Mo atoms. In the fifth S site, S is bonded in a 4-coordinate geometry to one K and three Mo atoms. In the sixth S site, S is bonded in a distorted rectangular see-saw-like geometry to one K and three Mo atoms. In the seventh S site, S is bonded in a 5-coordinate geometry to one K and four Mo atoms. In the eighth S site, S is bonded in a 7-coordinate geometry to one K and six Mo atoms. In the ninth S site, S is bonded in a 6-coordinate geometry to six Mo atoms. In the tenth S site, S is bonded in a distorted rectangular see-saw-like geometry to one K and three equivalent Mo atoms. In the eleventh S site, S is bonded in a 4-coordinate geometry to one K and three equivalent Mo atoms. In the twelfth S site, S is bonded in a 7-coordinate geometry to one K and six Mo atoms.