Search NASA⌕ Search

DOE OSTI · 1475875

Materials Data on K5Na3Nb7WO20 by Materials Project

Abstract

K5Na3Nb7WO20 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twenty inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.72–3.15 Å. In the second K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.58–3.10 Å. In the third K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.63–2.88 Å. In the fourth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.76–3.17 Å. In the fifth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.64–3.28 Å. In the sixth K1+ site, K1+ is bonded in a 9-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.57–2.87 Å. In the seventh K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.68–3.17 Å. In the eighth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.71–3.00 Å. In the ninth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.67–3.03 Å. In the tenth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.70–3.40 Å. In the eleventh K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.71–3.25 Å. In the twelfth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.61–3.32 Å. In the thirteenth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.66–3.16 Å. In the fourteenth K1+ site, K1+ is bonded in a distorted q6 geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.71–2.97 Å. In the fifteenth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.74–3.42 Å. In the sixteenth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.65–3.09 Å. In the seventeenth K1+ site, K1+ is bonded in a 9-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.54–2.83 Å. In the eighteenth K1+ site, K1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of K–O bond distances ranging from 2.58–3.10 Å. In the nineteenth K1+ site, K1+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of K–O bond distances ranging from 2.71–3.19 Å. In the twentieth K1+ site, K1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of K–O bond distances ranging from 2.66–3.14 Å. There are twelve inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–3.00 Å. In the second Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.32–2.90 Å. In the third Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.34–3.04 Å. In the fourth Na1+ site, Na1+ is bonded in a 1-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.33–3.07 Å. In the fifth Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.45–2.98 Å. In the sixth Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.99 Å. In the seventh Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.45–2.72 Å. In the eighth Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.45–2.95 Å. In the ninth Na1+ site, Na1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Na–O bond distances ranging from 2.47–2.76 Å. In the tenth Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.44–2.97 Å. In the eleventh Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.98 Å. In the twelfth Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.40–2.99 Å. There are twenty-eight inequivalent Nb+4.29+ sites. In the first Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 2–10°. There are a spread of Nb–O bond distances ranging from 2.04–2.21 Å. In the second Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 1–11°. There are a spread of Nb–O bond distances ranging from 2.04–2.19 Å. In the third Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 3–10°. There are a spread of Nb–O bond distances ranging from 2.06–2.14 Å. In the fourth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share a cornercorner with one WO6 octahedra, corners with three NbO6 octahedra, and a cornercorner with one NbO4 tetrahedra. The corner-sharing octahedra tilt angles range from 2–3°. There are a spread of Nb–O bond distances ranging from 2.01–2.17 Å. In the fifth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 3–9°. There are a spread of Nb–O bond distances ranging from 2.05–2.12 Å. In the sixth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share a cornercorner with one NbO6 octahedra, corners with three WO6 octahedra, and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 2–4°. There are a spread of Nb–O bond distances ranging from 1.96–2.19 Å. In the seventh Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra, a cornercorner with one NbO4 tetrahedra, and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 3–4°. There are a spread of Nb–O bond distances ranging from 2.03–2.16 Å. In the eighth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 5–9°. There are a spread of Nb–O bond distances ranging from 2.06–2.15 Å. In the ninth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share a cornercorner with one NbO6 octahedra, corners with three WO6 octahedra, and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 2–7°. There are a spread of Nb–O bond distances ranging from 1.95–2.16 Å. In the tenth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and corners with two NbO4 tetrahedra. The corner-sharing octahedra tilt angles range from 3–11°. There are a spread of Nb–O bond distances ranging from 2.02–2.20 Å. In the eleventh Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share a cornercorner with one NbO6 octahedra, corners with three WO6 octahedra, and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 1–5°. There are a spread of Nb–O bond distances ranging from 1.97–2.24 Å. In the twelfth Nb+4.29+ site, Nb+4.29+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with four NbO6 octahedra and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 1–10°. There are a spread of Nb–O bond distances ranging from 2.03–2.22 Å. In the thirteenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 trigonal pyramids that share a cornercorner with one NbO6 octahedra, a cornercorner with one WO6 octahedra, and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 19–25°. There are a spread of Nb–O bond distances ranging from 1.93–2.02 Å. In the fourteenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 trigonal pyramids that share corners with two NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 22–30°. There are a spread of Nb–O bond distances ranging from 1.91–2.02 Å. In the fifteenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form NbO4 trigonal pyramids that share a cornercorner with one NbO6 octahedra, a cornercorner with one WO6 octahedra, and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 25–27°. There are a spread of Nb–O bond distances ranging from 1.92–2.03 Å. In the sixteenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form NbO4 trigonal pyramids that share a cornercorner with one NbO6 octahedra, a cornercorner with one WO6 octahedra, and corners with two NbO4 tetrahedra. The corner-sharing octahedra tilt angles range from 32–36°. There are a spread of Nb–O bond distances ranging from 1.88–2.04 Å. In the seventeenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 tetrahedra that share a cornercorner with one NbO6 octahedra, a cornercorner with one WO6 octahedra, and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 19–20°. There are a spread of Nb–O bond distances ranging from 1.91–1.98 Å. In the eighteenth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 trigonal pyramids that share corners with two NbO6 octahedra and corners with two NbO4 trigonal pyramids. The corner-sharing octahedra tilt angles range from 24–41°. There are a spread of Nb–O bond distances ranging from 1.90–2.02 Å. In the nineteenth Nb+4.29+ site, Nb+4.29+ is bonded in a see-saw-like geometry to four O2- atoms. There are a spread of Nb–O bond distances ranging from 1.92–2.00 Å. In the twentieth Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 trigonal pyramids that share corners with two NbO6 octahedra and corners with two NbO4 tetrahedra. The corner-sharing octahedra tilt angles range from 14–31°. There are a spread of Nb–O bond distances ranging from 1.91–2.01 Å. In the twenty-first Nb+4.29+ site, Nb+4.29+ is bonded to four O2- atoms to form distorted NbO4 trigonal pyramids that share corners with two NbO6 octahedra and a cornercorner with one NbO4 trigonal pyramid. The corner-sharing octahedra tilt angles range from 18–26°. There are a spread of Nb–O bond distances ranging from 1.95–2.00 Å. In the twenty-second Nb+4.29+ site, N

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-06-05. Materials Data on K5Na3Nb7WO20 by Materials Project. https://doi.org/10.17188/1475875

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↗