Search NASA⌕ Search

DOE OSTI · 1286118

Materials Data on La4TiMn5(PbO9)2 by Materials Project

Abstract

La4TiMn5(PbO9)2 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 3-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.47–2.80 Å. In the second La3+ site, La3+ is bonded in a 3-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.45–2.83 Å. In the third La3+ site, La3+ is bonded in a 3-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.45–2.82 Å. In the fourth La3+ site, La3+ is bonded in a 3-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.44–2.79 Å. Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with six MnO6 octahedra and faces with four PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 14–20°. There are a spread of Ti–O bond distances ranging from 1.96–2.00 Å. There are five inequivalent Mn+3.20+ sites. In the first Mn+3.20+ site, Mn+3.20+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six MnO6 octahedra and faces with two equivalent PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 12–21°. There are a spread of Mn–O bond distances ranging from 1.99–2.03 Å. In the second Mn+3.20+ site, Mn+3.20+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with six MnO6 octahedra and faces with two equivalent PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 12–21°. There are a spread of Mn–O bond distances ranging from 2.00–2.02 Å. In the third Mn+3.20+ site, Mn+3.20+ is bonded to six O2- atoms to form MnO6 octahedra that share a cornercorner with one TiO6 octahedra, corners with five MnO6 octahedra, and faces with two equivalent PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 12–21°. There are a spread of Mn–O bond distances ranging from 1.96–2.02 Å. In the fourth Mn+3.20+ site, Mn+3.20+ is bonded to six O2- atoms to form MnO6 octahedra that share corners with two MnO6 octahedra, corners with four equivalent TiO6 octahedra, and faces with four PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 14–21°. There are a spread of Mn–O bond distances ranging from 1.96–2.02 Å. In the fifth Mn+3.20+ site, Mn+3.20+ is bonded to six O2- atoms to form MnO6 octahedra that share a cornercorner with one TiO6 octahedra, corners with five MnO6 octahedra, and faces with two equivalent PbO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 12–21°. There are a spread of Mn–O bond distances ranging from 1.98–2.05 Å. There are two inequivalent Pb2+ sites. In the first Pb2+ site, Pb2+ is bonded to twelve O2- atoms to form distorted PbO12 cuboctahedra that share corners with eight PbO12 cuboctahedra, faces with two equivalent TiO6 octahedra, and faces with six MnO6 octahedra. There are a spread of Pb–O bond distances ranging from 2.56–3.12 Å. In the second Pb2+ site, Pb2+ is bonded to twelve O2- atoms to form distorted PbO12 cuboctahedra that share corners with eight PbO12 cuboctahedra, faces with two equivalent TiO6 octahedra, and faces with six MnO6 octahedra. There are a spread of Pb–O bond distances ranging from 2.55–3.11 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to three La3+, two Mn+3.20+, and one Pb2+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent La3+, one Ti4+, one Mn+3.20+, and two equivalent Pb2+ atoms. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Mn+3.20+ atoms. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to one La3+, one Ti4+, one Mn+3.20+, and two Pb2+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one La3+, one Ti4+, one Mn+3.20+, and two Pb2+ atoms. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent La3+, two Mn+3.20+, and two equivalent Pb2+ atoms. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to one La3+, two Mn+3.20+, and two equivalent Pb2+ atoms. In the eleventh O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, one Ti4+, one Mn+3.20+, and two Pb2+ atoms. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the thirteenth O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, one Ti4+, one Mn+3.20+, and two Pb2+ atoms. In the fourteenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Mn+3.20+ atoms. In the fifteenth O2- site, O2- is bonded in a 3-coordinate geometry to one La3+, one Ti4+, one Mn+3.20+, and two equivalent Pb2+ atoms. In the sixteenth O2- site, O2- is bonded in a 3-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the seventeenth O2- site, O2- is bonded in a 2-coordinate geometry to two La3+, two Mn+3.20+, and one Pb2+ atom. In the eighteenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+, two Mn+3.20+, and one Pb2+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-05-02. Materials Data on La4TiMn5(PbO9)2 by Materials Project. https://doi.org/10.17188/1286118

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↗