Search NASA⌕ Search

DOE OSTI · 1748031

Materials Data on Zr9V9O2 by Materials Project

Abstract

Zr9V9O2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are twelve inequivalent Zr sites. In the first Zr site, Zr is bonded in a distorted bent 150 degrees geometry to six V and two equivalent O atoms. There are a spread of Zr–V bond distances ranging from 2.96–3.21 Å. Both Zr–O bond lengths are 2.34 Å. In the second Zr site, Zr is bonded in a distorted bent 150 degrees geometry to six V and two equivalent O atoms. There are a spread of Zr–V bond distances ranging from 2.95–3.24 Å. Both Zr–O bond lengths are 2.33 Å. In the third Zr site, Zr is bonded in a distorted bent 150 degrees geometry to six V and two equivalent O atoms. There are a spread of Zr–V bond distances ranging from 2.94–3.25 Å. Both Zr–O bond lengths are 2.33 Å. In the fourth Zr site, Zr is bonded in a single-bond geometry to six V and one O atom. There are a spread of Zr–V bond distances ranging from 2.94–3.19 Å. The Zr–O bond length is 2.34 Å. In the fifth Zr site, Zr is bonded in a single-bond geometry to six V and one O atom. There are a spread of Zr–V bond distances ranging from 2.94–3.22 Å. The Zr–O bond length is 2.34 Å. In the sixth Zr site, Zr is bonded in a 2-coordinate geometry to eight Zr and six V atoms. There are a spread of Zr–Zr bond distances ranging from 3.29–3.40 Å. There are a spread of Zr–V bond distances ranging from 2.92–3.18 Å. In the seventh Zr site, Zr is bonded in a distorted bent 150 degrees geometry to six V and two O atoms. There are a spread of Zr–V bond distances ranging from 2.95–3.22 Å. There are one shorter (2.33 Å) and one longer (2.35 Å) Zr–O bond lengths. In the eighth Zr site, Zr is bonded in a single-bond geometry to two equivalent Zr, six V, and one O atom. There are a spread of Zr–V bond distances ranging from 2.92–3.21 Å. The Zr–O bond length is 2.33 Å. In the ninth Zr site, Zr is bonded in a distorted bent 150 degrees geometry to six V and two O atoms. There are a spread of Zr–V bond distances ranging from 2.95–3.22 Å. Both Zr–O bond lengths are 2.34 Å. In the tenth Zr site, Zr is bonded in a single-bond geometry to six V and one O atom. There are a spread of Zr–V bond distances ranging from 2.93–3.18 Å. The Zr–O bond length is 2.35 Å. In the eleventh Zr site, Zr is bonded in a single-bond geometry to one Zr, six V, and one O atom. There are a spread of Zr–V bond distances ranging from 2.92–3.21 Å. The Zr–O bond length is 2.34 Å. In the twelfth Zr site, Zr is bonded in a single-bond geometry to one Zr, six V, and one O atom. There are a spread of Zr–V bond distances ranging from 2.94–3.20 Å. The Zr–O bond length is 2.34 Å. There are fifteen inequivalent V sites. In the first V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.69–2.95 Å. In the second V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.68–2.96 Å. In the third V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.69–2.97 Å. In the fourth V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.70–2.96 Å. In the fifth V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are three shorter (2.70 Å) and two longer (2.95 Å) V–V bond lengths. In the sixth V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.69–2.95 Å. In the seventh V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.70–2.96 Å. In the eighth V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.71–3.00 Å. In the ninth V site, V is bonded in a 12-coordinate geometry to six Zr and six V atoms. There are a spread of V–V bond distances ranging from 2.69–2.96 Å. In the tenth V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with six OZr6 octahedra and faces with six VZr6V6 cuboctahedra. In the eleventh V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with four equivalent OZr6 octahedra and faces with six VZr6V6 cuboctahedra. In the twelfth V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with four equivalent OZr6 octahedra and faces with six VZr6V6 cuboctahedra. In the thirteenth V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with four OZr6 octahedra and faces with six VZr6V6 cuboctahedra. In the fourteenth V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with four OZr6 octahedra and faces with six VZr6V6 cuboctahedra. In the fifteenth V site, V is bonded to six Zr and six V atoms to form VZr6V6 cuboctahedra that share edges with three OZr6 octahedra and faces with six VZr6V6 cuboctahedra. There are three inequivalent O sites. In the first O site, O is bonded to six Zr atoms to form OZr6 octahedra that share corners with four equivalent OZr6 octahedra and edges with six VZr6V6 cuboctahedra. The corner-sharing octahedra tilt angles range from 39–40°. In the second O site, O is bonded to six Zr atoms to form OZr6 octahedra that share corners with two equivalent OZr6 octahedra and edges with six VZr6V6 cuboctahedra. The corner-sharing octahedral tilt angles are 38°. In the third O site, O is bonded to six Zr atoms to form OZr6 octahedra that share corners with four OZr6 octahedra and edges with six VZr6V6 cuboctahedra. The corner-sharing octahedra tilt angles range from 39–40°.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on Zr9V9O2 by Materials Project. https://doi.org/10.17188/1748031

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↗