Search NASA⌕ Search

DOE OSTI · 1262886

Materials Data on UCo5 by Materials Project

Abstract

UCo5 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded in a 12-coordinate geometry to fifteen Co atoms. There are a spread of U–Co bond distances ranging from 2.77–2.97 Å. In the second U site, U is bonded in a distorted hexagonal planar geometry to eighteen Co atoms. There are six shorter (2.74 Å) and twelve longer (3.12 Å) U–Co bond lengths. There are five inequivalent Co sites. In the first Co site, Co is bonded to four U and eight Co atoms to form a mixture of distorted corner, edge, and face-sharing CoU4Co8 cuboctahedra. There are a spread of Co–Co bond distances ranging from 2.32–2.97 Å. In the second Co site, Co is bonded to two equivalent U and ten Co atoms to form a mixture of corner, edge, and face-sharing CoU2Co10 cuboctahedra. There are six shorter (2.37 Å) and four longer (2.68 Å) Co–Co bond lengths. In the third Co site, Co is bonded to three equivalent U and nine Co atoms to form distorted CoU3Co9 cuboctahedra that share corners with eighteen CoU4Co8 cuboctahedra, edges with six equivalent CoU3Co9 cuboctahedra, and faces with nineteen CoU4Co8 cuboctahedra. All Co–Co bond lengths are 2.82 Å. In the fourth Co site, Co is bonded to three equivalent U and nine Co atoms to form distorted CoU3Co9 cuboctahedra that share corners with eighteen CoU4Co8 cuboctahedra, edges with six equivalent CoU3Co9 cuboctahedra, and faces with twenty-two CoU4Co8 cuboctahedra. All Co–Co bond lengths are 2.74 Å. In the fifth Co site, Co is bonded in a 4-coordinate geometry to three equivalent U and thirteen Co atoms. The Co–Co bond length is 2.52 Å.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-07-18. Materials Data on UCo5 by Materials Project. https://doi.org/10.17188/1262886

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↗