Search NASA⌕ Search

DOE OSTI · 1291307

Materials Data on B8O by Materials Project

Abstract

B8O crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are fourteen inequivalent B sites. In the first B site, B is bonded in a single-bond geometry to three B and one O atom. There is two shorter (1.77 Å) and one longer (1.81 Å) B–B bond length. The B–O bond length is 1.48 Å. In the second B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.69 Å) and four longer (1.77 Å) B–B bond length. In the third B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.83 Å. In the fourth B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.83 Å. In the fifth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is two shorter (1.77 Å) and one longer (1.81 Å) B–B bond length. In the sixth B site, B is bonded in a single-bond geometry to four B and one O atom. There is one shorter (1.76 Å) and one longer (1.77 Å) B–B bond length. The B–O bond length is 1.48 Å. In the seventh B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.69–1.83 Å. In the eighth B site, B is bonded in a single-bond geometry to four B and one O atom. The B–B bond length is 1.78 Å. The B–O bond length is 1.48 Å. In the ninth B site, B is bonded in a single-bond geometry to three B and one O atom. The B–O bond length is 1.48 Å. In the tenth B site, B is bonded in a 7-coordinate geometry to seven B atoms. Both B–B bond lengths are 2.31 Å. In the eleventh B site, B is bonded in a 6-coordinate geometry to six B atoms. There are a spread of B–B bond distances ranging from 1.76–1.83 Å. In the twelfth B site, B is bonded in a single-bond geometry to four B and one O atom. There is one shorter (1.76 Å) and one longer (1.77 Å) B–B bond length. The B–O bond length is 1.48 Å. In the thirteenth B site, B is bonded in a 6-coordinate geometry to six B atoms. There is one shorter (1.69 Å) and one longer (1.83 Å) B–B bond length. In the fourteenth B site, B is bonded in a 7-coordinate geometry to seven B atoms. There are two inequivalent O sites. In the first O site, O is bonded in a trigonal planar geometry to three B atoms. In the second O site, O is bonded in a trigonal planar geometry to three B atoms.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-07-15. Materials Data on B8O by Materials Project. https://doi.org/10.17188/1291307

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↗