Search NASA⌕ Search

DOE OSTI · 1305749

Materials Data on In2WO6 by Materials Project

Abstract

WIn2O6 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. W6+ is bonded to six O2- atoms to form WO6 octahedra that share corners with two equivalent WO6 octahedra, corners with three equivalent InO7 pentagonal bipyramids, and an edgeedge with one InO7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 51°. There are a spread of W–O bond distances ranging from 1.82–2.17 Å. There are two inequivalent In3+ sites. In the first In3+ site, In3+ is bonded to seven O2- atoms to form distorted InO7 pentagonal bipyramids that share corners with three equivalent WO6 octahedra, an edgeedge with one WO6 octahedra, and edges with three equivalent InO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 13–36°. There are a spread of In–O bond distances ranging from 2.19–2.37 Å. In the second In3+ site, In3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of In–O bond distances ranging from 2.17–2.58 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent W6+ and two equivalent In3+ atoms to form distorted OIn2W2 trigonal pyramids that share corners with two equivalent OIn4 tetrahedra, an edgeedge with one OIn4 tetrahedra, and edges with two equivalent OIn2W2 trigonal pyramids. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one W6+ and two equivalent In3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one W6+ and two equivalent In3+ atoms. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one W6+ and two equivalent In3+ atoms. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one W6+ and two In3+ atoms. In the sixth O2- site, O2- is bonded to four In3+ atoms to form OIn4 tetrahedra that share corners with two equivalent OIn2W2 trigonal pyramids, edges with two equivalent OIn4 tetrahedra, and an edgeedge with one OIn2W2 trigonal pyramid.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on In2WO6 by Materials Project. https://doi.org/10.17188/1305749

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↗