Search NASA⌕ Search

DOE OSTI · 1710493

Materials Data on RbCu3P3(O4F3)2 by Materials Project

Abstract

RbCu3P3(O4F3)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Rb1+ is bonded in a 2-coordinate geometry to eight O2- and two equivalent F1- atoms. There are a spread of Rb–O bond distances ranging from 2.84–3.27 Å. Both Rb–F bond lengths are 3.24 Å. There are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded to three O2- and one F1- atom to form distorted CuO3F tetrahedra that share corners with three PO2F2 tetrahedra. There are a spread of Cu–O bond distances ranging from 1.87–2.15 Å. The Cu–F bond length is 2.03 Å. In the second Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to two equivalent O2- and four F1- atoms. Both Cu–O bond lengths are 2.07 Å. There are two shorter (1.90 Å) and two longer (2.62 Å) Cu–F bond lengths. There are two 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 equivalent CuO3F tetrahedra. There is one shorter (1.48 Å) and one longer (1.51 Å) P–O bond length. There is one shorter (1.56 Å) and one longer (1.58 Å) P–F bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent CuO3F tetrahedra. There is two shorter (1.52 Å) and two longer (1.57 Å) P–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Rb1+ and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one P5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to one Rb1+, one Cu2+, and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Rb1+, one Cu2+, and one P5+ atom. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted bent 150 degrees geometry to two Cu2+ atoms. In the second F1- site, F1- is bonded in a single-bond geometry to one Cu2+ and one P5+ atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Rb1+ and one P5+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-05-02. Materials Data on RbCu3P3(O4F3)2 by Materials Project. https://doi.org/10.17188/1710493

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↗