Search NASA⌕ Search

DOE OSTI · 1730391

Materials Data on Ag9P14(OF)28 by Materials Project

Abstract

Ag9P14(OF)28 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are five inequivalent Ag+1.56+ sites. In the first Ag+1.56+ site, Ag+1.56+ is bonded to six O2- atoms to form distorted AgO6 octahedra that share corners with six PO2F2 tetrahedra, edges with two equivalent AgO6 octahedra, and an edgeedge with one AgO5 square pyramid. There are a spread of Ag–O bond distances ranging from 2.39–2.73 Å. In the second Ag+1.56+ site, Ag+1.56+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ag–O bond distances ranging from 2.34–2.73 Å. In the third Ag+1.56+ site, Ag+1.56+ is bonded to six O2- atoms to form distorted AgO6 octahedra that share corners with six PO2F2 tetrahedra. There are a spread of Ag–O bond distances ranging from 2.13–2.80 Å. In the fourth Ag+1.56+ site, Ag+1.56+ is bonded to six O2- atoms to form AgO6 octahedra that share corners with six PO2F2 tetrahedra and edges with two equivalent AgO6 octahedra. There are a spread of Ag–O bond distances ranging from 2.23–2.62 Å. In the fifth Ag+1.56+ site, Ag+1.56+ is bonded to five O2- atoms to form distorted AgO5 square pyramids that share corners with five PO2F2 tetrahedra and an edgeedge with one AgO6 octahedra. There are a spread of Ag–O bond distances ranging from 2.17–2.65 Å. There are seven inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share corners with two AgO6 octahedra and a cornercorner with one AgO5 square pyramid. The corner-sharing octahedra tilt angles range from 49–60°. Both P–O bond lengths are 1.50 Å. There is one shorter (1.56 Å) and one longer (1.57 Å) P–F bond length. In the second P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share a cornercorner with one AgO6 octahedra and a cornercorner with one AgO5 square pyramid. The corner-sharing octahedral tilt angles are 56°. There is one shorter (1.50 Å) and one longer (1.51 Å) P–O bond length. Both P–F bond lengths are 1.56 Å. In the third P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share corners with three AgO6 octahedra. The corner-sharing octahedra tilt angles range from 51–53°. There is one shorter (1.50 Å) and one longer (1.51 Å) P–O bond length. Both P–F bond lengths are 1.56 Å. In the fourth P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share corners with four AgO6 octahedra. The corner-sharing octahedra tilt angles range from 45–59°. There is one shorter (1.50 Å) and one longer (1.51 Å) P–O bond length. Both P–F bond lengths are 1.56 Å. In the fifth P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share corners with two AgO6 octahedra and a cornercorner with one AgO5 square pyramid. The corner-sharing octahedra tilt angles range from 49–51°. There is one shorter (1.50 Å) and one longer (1.51 Å) P–O bond length. There is one shorter (1.56 Å) and one longer (1.57 Å) P–F bond length. In the sixth P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share a cornercorner with one AgO6 octahedra and a cornercorner with one AgO5 square pyramid. The corner-sharing octahedral tilt angles are 40°. There is one shorter (1.49 Å) and one longer (1.52 Å) P–O bond length. Both P–F bond lengths are 1.57 Å. In the seventh P5+ site, P5+ is bonded to two O2- and two F1- atoms to form PO2F2 tetrahedra that share corners with two AgO6 octahedra and a cornercorner with one AgO5 square pyramid. The corner-sharing octahedra tilt angles range from 46–52°. There is one shorter (1.50 Å) and one longer (1.51 Å) P–O bond length. Both P–F bond lengths are 1.57 Å. There are fourteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Ag+1.56+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two Ag+1.56+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ag+1.56+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two Ag+1.56+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Ag+1.56+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted single-bond geometry to two Ag+1.56+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a 1-coordinate geometry to two Ag+1.56+ and one P5+ atom. There are fourteen inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the sixth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the seventh F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the eighth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the ninth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the tenth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the eleventh F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the twelfth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the thirteenth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom. In the fourteenth F1- site, F1- is bonded in a single-bond geometry to one P5+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-06-04. Materials Data on Ag9P14(OF)28 by Materials Project. https://doi.org/10.17188/1730391

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↗