Search NASA⌕ Search

DOE OSTI · 1681697

Materials Data on La12Ge5S28 by Materials Project

Abstract

La12Ge5S28 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 2.88–3.10 Å. In the second 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 2.83–3.46 Å. In the third 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 2.83–3.46 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 2.90–3.10 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 2.90–3.08 Å. In the sixth 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 2.84–3.45 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 2.83–3.27 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 2.92–3.19 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 2.92–3.19 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 2.82–3.27 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 2.83–3.26 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 2.92–3.19 Å. There are five inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Ge–S bond distances ranging from 2.20–2.25 Å. In the second Ge4+ site, Ge4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Ge–S bond distances ranging from 2.21–2.25 Å. In the third Ge4+ site, Ge4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Ge–S bond distances ranging from 2.20–2.26 Å. In the fourth Ge4+ site, Ge4+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of Ge–S bond distances ranging from 2.20–2.25 Å. In the fifth Ge4+ site, Ge4+ is bonded in an octahedral geometry to six S2- atoms. There are a spread of Ge–S bond distances ranging from 2.45–2.50 Å. There are twenty-eight inequivalent S2- sites. In the first S2- site, S2- is bonded to three La3+ and one Ge4+ atom to form distorted corner-sharing SLa3Ge tetrahedra. In the second S2- site, S2- is bonded to three La3+ and one Ge4+ atom to form distorted corner-sharing SLa3Ge tetrahedra. In the third S2- site, S2- is bonded to three La3+ and one Ge4+ atom to form distorted corner-sharing SLa3Ge tetrahedra. In the fourth S2- site, S2- is bonded to three La3+ and one Ge4+ atom to form distorted corner-sharing SLa3Ge tetrahedra. In the fifth S2- site, S2- is bonded to four La3+ atoms to form distorted SLa4 trigonal pyramids that share corners with four SLa3Ge tetrahedra and corners with two SLa4 trigonal pyramids. In the sixth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ atom. In the seventh S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ atom. In the eighth S2- site, S2- is bonded to four La3+ atoms to form distorted SLa4 trigonal pyramids that share corners with four SLa3Ge tetrahedra and corners with two SLa4 trigonal pyramids. In the ninth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ atom. In the tenth S2- site, S2- is bonded to four La3+ atoms to form distorted SLa4 trigonal pyramids that share corners with four SLa3Ge tetrahedra and corners with two SLa4 trigonal pyramids. In the eleventh S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ 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 four La3+ atoms. In the fourteenth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ atom. In the fifteenth S2- site, S2- is bonded in a 4-coordinate geometry to four La3+ atoms. In the sixteenth S2- site, S2- is bonded in a 5-coordinate geometry to four La3+ and one Ge4+ atom. In the seventeenth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Ge4+ atom. In the eighteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the nineteenth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the twentieth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Ge4+ atom. In the twenty-first S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the twenty-second S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the twenty-third S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the twenty-fourth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Ge4+ atom. In the twenty-fifth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom. In the twenty-sixth S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Ge4+ atom. In the twenty-seventh S2- site, S2- is bonded in a 4-coordinate geometry to three La3+ and one Ge4+ atom. In the twenty-eighth S2- site, S2- is bonded in a distorted rectangular see-saw-like geometry to three La3+ and one Ge4+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on La12Ge5S28 by Materials Project. https://doi.org/10.17188/1681697

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↗