Search NASA⌕ Search
Home/Archive/DOE OSTI

DOE OSTI · 1656273

Materials Data on Ti3(TeSe)2 by Materials Project

View original source ↗Read source document ↗Export metadata ↓

Abstract

Ti3(TeSe)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ti+2.67+ sites. In the first Ti+2.67+ site, Ti+2.67+ is bonded to three equivalent Te2- and three equivalent Se2- atoms to form distorted TiTe3Se3 octahedra that share corners with six equivalent TiTe4Se2 octahedra, edges with six equivalent TiTe3Se3 octahedra, and a faceface with one TiTe4Se2 octahedra. The corner-sharing octahedra tilt angles range from 47–63°. There are two shorter (2.87 Å) and one longer (3.01 Å) Ti–Te bond lengths. There are one shorter (2.53 Å) and two longer (2.57 Å) Ti–Se bond lengths. In the second Ti+2.67+ site, Ti+2.67+ is bonded to four equivalent Te2- and two equivalent Se2- atoms to form TiTe4Se2 octahedra that share corners with twelve equivalent TiTe3Se3 octahedra, edges with two equivalent TiTe4Se2 octahedra, and faces with two equivalent TiTe3Se3 octahedra. The corner-sharing octahedra tilt angles range from 47–63°. All Ti–Te bond lengths are 2.80 Å. Both Ti–Se bond lengths are 2.58 Å. Te2- is bonded in a 5-coordinate geometry to five Ti+2.67+ atoms. Se2- is bonded in a 4-coordinate geometry to four Ti+2.67+ atoms.

Explore related subjects

36 MATERIALS SCIENCEcrystal structureSe-Te-TiTi3(TeSe)2

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-07-23. Materials Data on Ti3(TeSe)2 by Materials Project. https://doi.org/10.17188/1656273

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

DOE OSTI2026

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↗