Search NASA⌕ Search

DOE OSTI · 1738663

Materials Data on Yb4Y by Materials Project

Abstract

Yb4Y crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are seven inequivalent Yb sites. In the first Yb site, Yb is bonded to nine Yb and three equivalent Y atoms to form YbYb9Y3 cuboctahedra that share corners with twelve YbYb9Y3 cuboctahedra, edges with six equivalent YYb6Y6 cuboctahedra, edges with eighteen YbYb9Y3 cuboctahedra, faces with six equivalent YYb6Y6 cuboctahedra, and faces with twelve YbYb9Y3 cuboctahedra. There are six shorter (3.75 Å) and three longer (3.88 Å) Yb–Yb bond lengths. All Yb–Y bond lengths are 3.70 Å. In the second Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are six shorter (3.75 Å) and three longer (3.84 Å) Yb–Yb bond lengths. In the third Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are six shorter (3.75 Å) and three longer (3.88 Å) Yb–Yb bond lengths. In the fourth Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are a spread of Yb–Yb bond distances ranging from 3.75–3.88 Å. In the fifth Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are six shorter (3.75 Å) and three longer (3.88 Å) Yb–Yb bond lengths. In the sixth Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are a spread of Yb–Yb bond distances ranging from 3.75–3.88 Å. In the seventh Yb site, Yb is bonded to twelve Yb atoms to form YbYb12 cuboctahedra that share corners with three equivalent YYb6Y6 cuboctahedra, corners with nine YbYb9Y3 cuboctahedra, edges with three equivalent YYb6Y6 cuboctahedra, edges with twenty-one YbYb9Y3 cuboctahedra, and faces with eighteen YbYb9Y3 cuboctahedra. There are six shorter (3.75 Å) and three longer (3.88 Å) Yb–Yb bond lengths. Y is bonded to six equivalent Yb and six equivalent Y atoms to form YYb6Y6 cuboctahedra that share corners with six YbYb12 cuboctahedra, corners with six equivalent YYb6Y6 cuboctahedra, edges with six equivalent YYb6Y6 cuboctahedra, edges with eighteen YbYb9Y3 cuboctahedra, faces with six equivalent YYb6Y6 cuboctahedra, and faces with twelve equivalent YbYb9Y3 cuboctahedra. All Y–Y bond lengths are 3.75 Å.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-05-05. Materials Data on Yb4Y by Materials Project. https://doi.org/10.17188/1738663

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↗