Search NASA⌕ Search

DOE OSTI · 1313232

Materials Data on Eu(GaSb)2 by Materials Project

Abstract

EuGa2Sb2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Eu2+ sites. In the first Eu2+ site, Eu2+ is bonded in a 6-coordinate geometry to six Sb3- atoms. There are a spread of Eu–Sb bond distances ranging from 3.39–3.47 Å. In the second Eu2+ site, Eu2+ is bonded in a 6-coordinate geometry to six Sb3- atoms. There are a spread of Eu–Sb bond distances ranging from 3.41–3.48 Å. In the third Eu2+ site, Eu2+ is bonded in a 6-coordinate geometry to six Sb3- atoms. There are a spread of Eu–Sb bond distances ranging from 3.39–3.47 Å. In the fourth Eu2+ site, Eu2+ is bonded in a 6-coordinate geometry to six Sb3- atoms. There are a spread of Eu–Sb bond distances ranging from 3.40–3.47 Å. There are eight inequivalent Ga2+ sites. In the first Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. All Ga–Sb bond lengths are 2.72 Å. In the second Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. All Ga–Sb bond lengths are 2.72 Å. In the third Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. All Ga–Sb bond lengths are 2.72 Å. In the fourth Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. All Ga–Sb bond lengths are 2.72 Å. In the fifth Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. There are two shorter (2.73 Å) and one longer (2.86 Å) Ga–Sb bond lengths. In the sixth Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. There are a spread of Ga–Sb bond distances ranging from 2.72–2.86 Å. In the seventh Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. There are two shorter (2.73 Å) and one longer (2.87 Å) Ga–Sb bond lengths. In the eighth Ga2+ site, Ga2+ is bonded in a trigonal non-coplanar geometry to three Sb3- atoms. There are a spread of Ga–Sb bond distances ranging from 2.72–2.87 Å. There are eight inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the second Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the third Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the fourth Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the fifth Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the sixth Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the seventh Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms. In the eighth Sb3- site, Sb3- is bonded in a 6-coordinate geometry to three Eu2+ and three Ga2+ atoms.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-08-03. Materials Data on Eu(GaSb)2 by Materials Project. https://doi.org/10.17188/1313232

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↗