Search NASA⌕ Search

DOE OSTI · 1663626

Materials Data on Dy4Ga21Ni10 by Materials Project

Abstract

Dy4Ni10Ga21 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Dy sites. In the first Dy site, Dy is bonded in a 7-coordinate geometry to four Ni and eleven Ga atoms. There are two shorter (3.11 Å) and two longer (3.18 Å) Dy–Ni bond lengths. There are a spread of Dy–Ga bond distances ranging from 2.88–3.42 Å. In the second Dy site, Dy is bonded in a 2-coordinate geometry to four Ni and eleven Ga atoms. There are two shorter (3.01 Å) and two longer (3.11 Å) Dy–Ni bond lengths. There are a spread of Dy–Ga bond distances ranging from 2.89–3.47 Å. There are five inequivalent Ni sites. In the first Ni site, Ni is bonded in a 10-coordinate geometry to two equivalent Dy, one Ni, and seven Ga atoms. The Ni–Ni bond length is 2.77 Å. There are a spread of Ni–Ga bond distances ranging from 2.39–2.59 Å. In the second Ni site, Ni is bonded in a 9-coordinate geometry to nine Ga atoms. There are a spread of Ni–Ga bond distances ranging from 2.48–2.60 Å. In the third Ni site, Ni is bonded in a 10-coordinate geometry to two equivalent Dy, one Ni, and seven Ga atoms. There are a spread of Ni–Ga bond distances ranging from 2.46–2.58 Å. In the fourth Ni site, Ni is bonded in a 9-coordinate geometry to two equivalent Dy and seven Ga atoms. There are a spread of Ni–Ga bond distances ranging from 2.37–2.57 Å. In the fifth Ni site, Ni is bonded in a 10-coordinate geometry to two equivalent Dy and eight Ga atoms. There are a spread of Ni–Ga bond distances ranging from 2.46–2.73 Å. There are eleven inequivalent Ga sites. In the first Ga site, Ga is bonded in a 4-coordinate geometry to one Dy, four Ni, and five Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.76–2.88 Å. In the second Ga site, Ga is bonded in a 5-coordinate geometry to two equivalent Dy, three Ni, and one Ga atom. The Ga–Ga bond length is 2.66 Å. In the third Ga site, Ga is bonded in a 10-coordinate geometry to three Dy, three Ni, and three Ga atoms. There are one shorter (2.69 Å) and two longer (2.91 Å) Ga–Ga bond lengths. In the fourth Ga site, Ga is bonded in a 3-coordinate geometry to one Dy, four Ni, and six Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.67–2.91 Å. In the fifth Ga site, Ga is bonded in a 12-coordinate geometry to three Dy, four Ni, and five Ga atoms. In the sixth Ga site, Ga is bonded in a 5-coordinate geometry to two Dy, five Ni, and two Ga atoms. The Ga–Ga bond length is 2.81 Å. In the seventh Ga site, Ga is bonded in a 5-coordinate geometry to two equivalent Dy, three Ni, and two Ga atoms. There are one shorter (2.62 Å) and one longer (2.79 Å) Ga–Ga bond lengths. In the eighth Ga site, Ga is bonded in a 1-coordinate geometry to two Dy, three Ni, and four Ga atoms. There are two shorter (2.93 Å) and two longer (3.10 Å) Ga–Ga bond lengths. In the ninth Ga site, Ga is bonded in a 12-coordinate geometry to four equivalent Ni and eight Ga atoms. In the tenth Ga site, Ga is bonded in a 12-coordinate geometry to three equivalent Dy, three equivalent Ni, and six Ga atoms. Both Ga–Ga bond lengths are 2.89 Å. In the eleventh Ga site, Ga is bonded in a 12-coordinate geometry to three equivalent Dy, four Ni, and five Ga atoms. Both Ga–Ga bond lengths are 2.95 Å.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-30. Materials Data on Dy4Ga21Ni10 by Materials Project. https://doi.org/10.17188/1663626

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↗