Search NASA⌕ Search

DOE OSTI · 1310395

Materials Data on KMo6S7 by Materials Project

Abstract

KMo6S7 crystallizes in the monoclinic Pc space group. The structure is three-dimensional. there are four inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of K–S bond distances ranging from 3.05–3.40 Å. In the second K1+ site, K1+ is bonded in a 5-coordinate geometry to eight S2- atoms. There are a spread of K–S bond distances ranging from 3.13–3.81 Å. In the third K1+ site, K1+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of K–S bond distances ranging from 3.09–3.78 Å. In the fourth K1+ site, K1+ is bonded in a 7-coordinate geometry to seven S2- atoms. There are a spread of K–S bond distances ranging from 3.19–3.62 Å. There are twenty-four inequivalent Mo+2.17+ sites. In the first Mo+2.17+ site, Mo+2.17+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.38–2.79 Å. In the second Mo+2.17+ site, Mo+2.17+ is bonded to five S2- atoms to form distorted MoS5 trigonal bipyramids that share a cornercorner with one MoS4 trigonal pyramid and edges with two MoS5 trigonal bipyramids. There are a spread of Mo–S bond distances ranging from 2.25–2.55 Å. In the third Mo+2.17+ site, Mo+2.17+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of Mo–S bond distances ranging from 2.24–2.45 Å. In the fourth Mo+2.17+ site, Mo+2.17+ is bonded in a see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.39–2.55 Å. In the fifth Mo+2.17+ site, Mo+2.17+ is bonded in a see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.36–2.61 Å. In the sixth Mo+2.17+ site, Mo+2.17+ is bonded in a distorted see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.42–2.59 Å. In the seventh Mo+2.17+ site, Mo+2.17+ is bonded to four S2- atoms to form corner-sharing MoS4 trigonal pyramids. There are a spread of Mo–S bond distances ranging from 2.28–2.53 Å. In the eighth Mo+2.17+ site, Mo+2.17+ is bonded to four S2- atoms to form edge-sharing MoS4 trigonal pyramids. There are a spread of Mo–S bond distances ranging from 2.41–2.50 Å. In the ninth Mo+2.17+ site, Mo+2.17+ is bonded in a distorted see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.43–2.68 Å. In the tenth Mo+2.17+ site, Mo+2.17+ is bonded in a distorted rectangular see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.40–2.52 Å. In the eleventh Mo+2.17+ site, Mo+2.17+ is bonded to four S2- atoms to form distorted edge-sharing MoS4 tetrahedra. There are a spread of Mo–S bond distances ranging from 2.31–2.42 Å. In the twelfth Mo+2.17+ site, Mo+2.17+ is bonded in a 5-coordinate geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.37–2.99 Å. In the thirteenth Mo+2.17+ site, Mo+2.17+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.34–2.62 Å. In the fourteenth Mo+2.17+ site, Mo+2.17+ is bonded in a 5-coordinate geometry to five S2- atoms. There are a spread of Mo–S bond distances ranging from 2.34–2.70 Å. In the fifteenth Mo+2.17+ site, Mo+2.17+ is bonded in a distorted trigonal non-coplanar geometry to three S2- atoms. There are a spread of Mo–S bond distances ranging from 2.39–2.56 Å. In the sixteenth Mo+2.17+ site, Mo+2.17+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.39–2.93 Å. In the seventeenth Mo+2.17+ site, Mo+2.17+ is bonded in a see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.38–2.44 Å. In the eighteenth Mo+2.17+ site, Mo+2.17+ is bonded to four S2- atoms to form corner-sharing MoS4 trigonal pyramids. There are a spread of Mo–S bond distances ranging from 2.31–2.44 Å. In the nineteenth Mo+2.17+ site, Mo+2.17+ is bonded in a rectangular see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.35–2.55 Å. In the twentieth Mo+2.17+ site, Mo+2.17+ is bonded to five S2- atoms to form distorted MoS5 trigonal bipyramids that share a cornercorner with one MoS4 trigonal pyramid and edges with two MoS5 trigonal bipyramids. There are a spread of Mo–S bond distances ranging from 2.38–2.63 Å. In the twenty-first Mo+2.17+ site, Mo+2.17+ is bonded in a rectangular see-saw-like geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.37–2.45 Å. In the twenty-second Mo+2.17+ site, Mo+2.17+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are a spread of Mo–S bond distances ranging from 2.26–2.42 Å. In the twenty-third Mo+2.17+ site, Mo+2.17+ is bonded to five S2- atoms to form distorted MoS5 trigonal bipyramids that share a cornercorner with one MoS4 trigonal pyramid and edges with two MoS5 trigonal bipyramids. There are a spread of Mo–S bond distances ranging from 2.31–2.55 Å. In the twenty-fourth Mo+2.17+ site, Mo+2.17+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Mo–S bond distances ranging from 2.40–2.66 Å. There are twenty-eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the second S2- site, S2- is bonded in a 2-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the fourth S2- site, S2- is bonded in a 6-coordinate geometry to two K1+ and four Mo+2.17+ atoms. In the fifth S2- site, S2- is bonded in a 5-coordinate geometry to one K1+ and four Mo+2.17+ atoms. In the sixth S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the seventh S2- site, S2- is bonded in a 7-coordinate geometry to one K1+ and six Mo+2.17+ atoms. In the eighth S2- site, S2- is bonded in a 7-coordinate geometry to one K1+ and six Mo+2.17+ atoms. In the ninth S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the tenth S2- site, S2- is bonded in a 5-coordinate geometry to one K1+ and four Mo+2.17+ atoms. In the eleventh S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and four Mo+2.17+ atoms. In the twelfth S2- site, S2- is bonded in a 2-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the thirteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to one K1+ and three Mo+2.17+ atoms. In the fourteenth S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the fifteenth S2- site, S2- is bonded in a 4-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the sixteenth S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the seventeenth S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the eighteenth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+2.17+ atoms. In the nineteenth S2- site, S2- is bonded in a 5-coordinate geometry to one K1+ and four Mo+2.17+ atoms. In the twentieth S2- site, S2- is bonded in a 3-coordinate geometry to three Mo+2.17+ atoms. In the twenty-first S2- site, S2- is bonded in a 7-coordinate geometry to one K1+ and six Mo+2.17+ atoms. In the twenty-second S2- site, S2- is bonded in a 6-coordinate geometry to one K1+ and five Mo+2.17+ atoms. In the twenty-third S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the twenty-fourth S2- site, S2- is bonded in a 6-coordinate geometry to two K1+ and four Mo+2.17+ atoms. In the twenty-fifth S2- site, S2- is bonded in a 6-coordinate geometry to two K1+ and four Mo+2.17+ atoms. In the twenty-sixth S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and three Mo+2.17+ atoms. In the twenty-seventh S2- site, S2- is bonded in a 3-coordinate geometry to one K1+ and two Mo+2.17+ atoms. In the twenty-eighth S2- site, S2- is bonded in a 5-coordinate geometry to one K1+ and four Mo+2.17+ atoms.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on KMo6S7 by Materials Project. https://doi.org/10.17188/1310395

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

Cyclic moisture reactivation of calcium sorbents for long duration thermochemical energy storage

The transition to a flexible and reliable energy infrastructure, using electro-thermal energy generation technologies such as geothermal, concentrated solar power, and nuclear, usually demands simultaneous advancement of thermal energy storage (TES) to support on-demand electricity generation and industrial applications while mitigating the inherent intermittency of renewable energy sources and power outages from direct energy generation. Among TES technologies, thermochemical energy storage (TCES) based on calcium looping emerges as a compelling high-power energy storage candidate due to its high reaction enthalpy, compatibility with elevated operating temperatures, and abundance of low-cost materials. However, the long-term durability of calcium-based sorbents for TCES is hindered by surface sintering and particle aggregation, leading to performance degradation over repeated thermal cycles. This study explores a moisture hydration-based strategy to regenerate a degraded calcium sorbent and mitigate performance degradation for long duration TCES. The addition of moisture transforms calcium oxide into calcium hydroxide and produces intercalation water layers, associated with a regenerated surface area and reduced calcium oxide crystallite size. Both these effects are beneficial in restoring the sorbents' reactivity for carbonization. Additionally, an optimized hydration-assisted reactivation protocol balances the recovered energy storage capacity with heating penalty required for moisture removal from hydrated samples, resulting in an enhanced energy storage capacity up to 176% compared to benchmark sorbents that undergo cycling without reactivation after 60 cycles. In conclusion, these results highlight the potential of hydration-assisted reactivation to enhance the long-term performance of TCES, providing an effective pathway to advancing electro-thermal storage technologies.

36 MATERIALS SCIENCE↗