Search NASA⌕ Search

DOE OSTI · 1284286

Materials Data on Nb8P15O56 by Materials Project

Abstract

(Nb8(P5O17)3)2(O2)5 crystallizes in the triclinic P1 space group. The structure is three-dimensional and consists of five water molecules and one Nb8(P5O17)3 framework. In the Nb8(P5O17)3 framework, there are eight inequivalent Nb+4.62+ sites. In the first Nb+4.62+ site, Nb+4.62+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.48–1.99 Å. In the second Nb+4.62+ site, Nb+4.62+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.97–2.17 Å. In the third Nb+4.62+ site, Nb+4.62+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.65–1.90 Å. In the fourth Nb+4.62+ site, Nb+4.62+ is bonded in a linear geometry to two O2- atoms. Both Nb–O bond lengths are 1.20 Å. In the fifth Nb+4.62+ site, Nb+4.62+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of Nb–O bond distances ranging from 1.72–2.03 Å. In the sixth Nb+4.62+ site, Nb+4.62+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.72–2.22 Å. In the seventh Nb+4.62+ site, Nb+4.62+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.20 Å) and one longer (1.22 Å) Nb–O bond length. In the eighth Nb+4.62+ site, Nb+4.62+ is bonded in a 2-coordinate geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.78–2.49 Å. There are fifteen inequivalent P5+ sites. In the first P5+ site, P5+ is bonded in a 2-coordinate geometry to five O2- atoms. There are a spread of P–O bond distances ranging from 1.54–2.43 Å. In the second P5+ site, P5+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.05–2.29 Å. In the third P5+ site, P5+ is bonded in a 1-coordinate geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.13–1.99 Å. In the fourth P5+ site, P5+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 0.88–2.53 Å. In the fifth P5+ site, P5+ is bonded in a distorted single-bond geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 0.88–2.02 Å. In the sixth P5+ site, P5+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.12–1.98 Å. In the seventh P5+ site, P5+ is bonded in a distorted bent 120 degrees geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.55–2.16 Å. In the eighth P5+ site, P5+ is bonded in a 3-coordinate geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.13–1.93 Å. In the ninth P5+ site, P5+ is bonded in a distorted bent 120 degrees geometry to five O2- atoms. There are a spread of P–O bond distances ranging from 1.55–2.42 Å. In the tenth P5+ site, P5+ is bonded in a 1-coordinate geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.08–1.99 Å. In the eleventh P5+ site, P5+ is bonded in a distorted single-bond geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 0.88–2.47 Å. In the twelfth P5+ site, P5+ is bonded in a distorted single-bond geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 0.88–2.56 Å. In the thirteenth P5+ site, P5+ is bonded in a 1-coordinate geometry to three O2- atoms. There are a spread of P–O bond distances ranging from 1.17–2.01 Å. In the fourteenth P5+ site, P5+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of P–O bond distances ranging from 1.08–2.45 Å. In the fifteenth P5+ site, P5+ is bonded in a distorted bent 120 degrees geometry to five O2- atoms. There are a spread of P–O bond distances ranging from 1.53–2.43 Å. There are fifty-one inequivalent O2- sites. In the first O2- site, O2- is bonded in a linear geometry to two P5+ atoms. In the second O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the third O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+, one P5+, and two O2- atoms. There is one shorter (1.91 Å) and one longer (1.96 Å) O–O bond length. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to two P5+ and two O2- atoms. The O–O bond length is 1.89 Å. In the ninth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the tenth O2- site, O2- is bonded in a 5-coordinate geometry to two P5+ and three O2- atoms. There are a spread of O–O bond distances ranging from 1.95–2.72 Å. In the eleventh O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ atom. In the twelfth O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. In the thirteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the fifteenth O2- site, O2- is bonded in a linear geometry to two P5+ atoms. In the sixteenth O2- site, O2- is bonded in a linear geometry to two P5+ atoms. In the seventeenth O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+ and one P5+ atom. In the eighteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ atom. In the twentieth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the twenty-first O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the twenty-second O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. The O–O bond length is 2.70 Å. In the twenty-third O2- site, O2- is bonded in a 1-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the twenty-fourth O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+ and one P5+ atom. In the twenty-fifth O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+ and one P5+ atom. In the twenty-sixth O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+, one P5+, and one O2- atom. The O–O bond length is 1.86 Å. In the twenty-seventh O2- site, O2- is bonded in a 4-coordinate geometry to two P5+ and two O2- atoms. The O–O bond length is 1.92 Å. In the twenty-eighth O2- site, O2- is bonded in a 1-coordinate geometry to one P5+ atom. In the twenty-ninth O2- site, O2- is bonded in a single-bond geometry to one Nb+4.62+ atom. In the thirtieth O2- site, O2- is bonded in a 2-coordinate geometry to one Nb+4.62+, one P5+, and two O2- atoms. The O–O bond length is 2.04 Å. In the thirty-first O2- site, O2- is bonded in a single-bond geometry to one Nb+4.62+ atom. In the thirty-second O2- site, O2- is bonded in a 2-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the thirty-third O2- site, O2- is bonded in a 1-coordinate geometry to two P5+ and three O2- atoms. There are one shorter (2.68 Å) and one longer (2.74 Å) O–O bond lengths. In the thirty-fourth O2- site, O2- is bonded in a single-bond geometry to one Nb+4.62+ atom. In the thirty-fifth O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. In the thirty-sixth O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. In the thirty-seventh O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ atom. In the thirty-eighth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the thirty-ninth O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the fortieth O2- site, O2- is bonded in a linear geometry to two P5+ atoms. In the forty-first O2- site, O2- is bonded in a bent 150 degrees geometry to one Nb+4.62+ and one P5+ atom. In the forty-second O2- site, O2- is bonded in a 2-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the forty-third O2- site, O2- is bonded in a distorted single-bond geometry to one P5+ atom. In the forty-fourth O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. The O–O bond length is 2.62 Å. In the forty-fifth O2- site, O2- is bonded in a 5-coordinate geometry to two P5+ and three O2- atoms. In the forty-sixth O2- site, O2- is bonded in a 2-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the forty-seventh O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+, one P5+, and two O2- atoms. In the forty-eighth O2- site, O2- is bonded in a distorted linear geometry to one Nb+4.62+ and one P5+ atom. In the forty-ninth O2- site, O2- is bonded in a 1-coordinate geometry to one Nb+4.62+ and one P5+ atom. In the fiftieth O2- site, O2- is bonded in a single-bond geometry to one P5+ and one O2- atom. In the fifty-first O2- site, O2- is bonded in a 1-coordinate geometry to one Nb+4.62+ and one P5+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on Nb8P15O56 by Materials Project. https://doi.org/10.17188/1284286

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↗