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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on ScAlCO by Materials Project

ScAlOC crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Sc3+ sites. In the first Sc3+ site, Sc3+ is bonded to six equivalent C4- atoms to form ScC6 octahedra that share corners with six equivalent AlC3O tetrahedra, edges with six equivalent ScC6 octahedra, and edges with six equivalent AlC3O tetrahedra. All Sc–C bond lengths are 2.40 Å. In the second Sc3+ site, Sc3+ is bonded to six equivalent O2- atoms to form ScO6 octahedra that share corners with six equivalent AlC3O tetrahedra and edges with six equivalent ScO6 octahedra. All Sc–O bond lengths are 2.15 Å. Al3+ is bonded to three equivalent C4- and one O2- atom to form AlC3O tetrahedra that share corners with six ScC6 octahedra, corners with six equivalent AlC3O tetrahedra, and edges with three equivalent ScC6 octahedra. The corner-sharing octahedra tilt angles range from 17–62°. All Al–C bond lengths are 2.03 Å. The Al–O bond length is 1.86 Å. C4- is bonded to three equivalent Sc3+ and three equivalent Al3+ atoms to form distorted CSc3Al3 octahedra that share corners with three equivalent CSc3Al3 octahedra, corners with three equivalent OSc3Al tetrahedra, and edges with nine equivalent CSc3Al3 octahedra. The corner-sharing octahedral tilt angles are 0°. O2- is bonded to three equivalent Sc3+ and one Al3+ atom to form distorted OSc3Al tetrahedra that share corners with three equivalent CSc3Al3 octahedra, corners with nine equivalent OSc3Al tetrahedra, and edges with three equivalent OSc3Al tetrahedra. The corner-sharing octahedral tilt angles are 69°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScAlCo by Materials Project

ScCoAl crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are two inequivalent Sc sites. In the first Sc site, Sc is bonded in a 12-coordinate geometry to three equivalent Sc, five Co, and seven Al atoms. There are two shorter (3.13 Å) and one longer (3.14 Å) Sc–Sc bond lengths. There are a spread of Sc–Co bond distances ranging from 2.77–3.09 Å. There are a spread of Sc–Al bond distances ranging from 3.00–3.08 Å. In the second Sc site, Sc is bonded in a 8-coordinate geometry to four Sc, seven Co, and five Al atoms. The Sc–Sc bond length is 2.82 Å. There are a spread of Sc–Co bond distances ranging from 2.89–3.03 Å. There are a spread of Sc–Al bond distances ranging from 2.89–3.07 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded to six Sc and six Al atoms to form distorted CoSc6Al6 cuboctahedra that share corners with four equivalent CoSc6Al6 cuboctahedra, corners with four equivalent AlSc6Al2Co4 cuboctahedra, edges with two equivalent CoSc6Al6 cuboctahedra, and faces with fourteen AlSc6Al2Co4 cuboctahedra. There are a spread of Co–Al bond distances ranging from 2.51–2.61 Å. In the second Co site, Co is bonded in a 12-coordinate geometry to six Sc, four Co, and two equivalent Al atoms. There are a spread of Co–Co bond distances ranging from 2.40–2.78 Å. Both Co–Al bond lengths are 2.45 Å. In the third Co site, Co is bonded in a 12-coordinate geometry to six Sc, four equivalent Co, and two equivalent Al atoms. Both Co–Al bond lengths are 2.46 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six Sc, four Co, and two equivalent Al atoms to form distorted AlSc6Al2Co4 cuboctahedra that share corners with two equivalent CoSc6Al6 cuboctahedra, corners with four equivalent AlSc6Al4Co2 cuboctahedra, edges with six equivalent AlSc6Al2Co4 cuboctahedra, faces with three equivalent CoSc6Al6 cuboctahedra, and faces with eight AlSc6Al2Co4 cuboctahedra. Both Al–Al bond lengths are 2.70 Å. In the second Al site, Al is bonded to six Sc, two equivalent Co, and four Al atoms to form distorted AlSc6Al4Co2 cuboctahedra that share corners with eight AlSc6Al2Co4 cuboctahedra, edges with two equivalent AlSc6Al4Co2 cuboctahedra, faces with four equivalent CoSc6Al6 cuboctahedra, and faces with ten AlSc6Al2Co4 cuboctahedra. There are one shorter (2.55 Å) and one longer (2.65 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScAlCO by Materials Project

ScAlOC crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Sc3+ is bonded to three equivalent C4- and three equivalent O2- atoms to form ScC3O3 octahedra that share corners with six equivalent AlC3O tetrahedra, edges with six equivalent ScC3O3 octahedra, and edges with three equivalent AlC3O tetrahedra. All Sc–C bond lengths are 2.35 Å. All Sc–O bond lengths are 2.18 Å. Al3+ is bonded to three equivalent C4- and one O2- atom to form AlC3O tetrahedra that share corners with six equivalent ScC3O3 octahedra, corners with six equivalent AlC3O tetrahedra, and edges with three equivalent ScC3O3 octahedra. The corner-sharing octahedra tilt angles range from 14–60°. All Al–C bond lengths are 2.05 Å. The Al–O bond length is 1.81 Å. C4- is bonded to three equivalent Sc3+ and three equivalent Al3+ atoms to form CSc3Al3 octahedra that share corners with six equivalent OSc3Al tetrahedra, edges with six equivalent CSc3Al3 octahedra, and edges with three equivalent OSc3Al tetrahedra. O2- is bonded to three equivalent Sc3+ and one Al3+ atom to form distorted OSc3Al tetrahedra that share corners with six equivalent CSc3Al3 octahedra, corners with six equivalent OSc3Al tetrahedra, and edges with three equivalent CSc3Al3 octahedra. The corner-sharing octahedra tilt angles range from 7–67°.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Free-standing ultrathin lithium metal–graphene oxide host foils with controllable thickness for lithium batteries

Thin (≤20 μm) and free-standing Li metal foils would enable precise prelithiation of anode materials and high-energy-density Li batteries. Existing Li metal foils are too thick (typically 50 to 750 μm) or too mechanically fragile for these applications. Here, we developed a facile and scalable process for the synthesis of an ultrathin (0.5 to 20 μm), free-standing and mechanically robust Li metal foil within a graphene oxide host. In addition to low areal capacities of ~0.1 to 3.7 mAh cm –2 , this Li foil also has a much-improved mechanical strength over conventional pure Li metal foil. Our Li foil can improve the initial Coulombic efficiency of graphite (93%) and silicon (79.4%) anodes to around 100% without generating excessive Li residue, and increases the capacity of Li-ion full cells by 8%. In conclusion, the cycle life of Li metal full cells is prolonged by nine times using this thin Li composite anode.

25 ENERGY STORAGE↗
DOE OSTI2023

Photometry and astrometry with JWST – III. A NIRCam-Gaia DR3 analysis of the open cluster NGC 2506

ABSTRACT In the third paper of this series aimed at developing the tools for analysing resolved stellar populations using the cameras on board of the James Webb Space Telescope (JWST), we present a detailed multiband study of the 2 Gyr Galactic open cluster NGC 2506. We employ public calibration data sets collected in multiple filters to: (i) derive improved effective Point Spread Functions (ePSFs) for 10 NIRCam filters; (ii) extract high-precision photometry and astrometry for stars in the cluster, approaching the main sequence (MS) lower mass of ∼0.1 M⊙; and (iii) take advantage of the synergy between JWST and Gaia DR3 to perform a comprehensive analysis of the cluster’s global and local properties. We derived a MS binary fraction of ∼57.5 per cent, extending the Gaia limit (∼0.8 M⊙) to lower masses (∼0.4 M⊙) with JWST. We conducted a study on the mass functions (MFs) of NGC 2506, mapping the mass segregation with Gaia data, and extending MFs to lower masses with the JWST field. We also combined information on the derived MFs to infer an estimate of the cluster present-day total mass. Lastly, we investigated the presence of white dwarfs (WDs) and identified a strong candidate. However, to firmly establish its cluster membership, as well as that of four other WD candidates and of the majority of faint low-mass MS stars, further JWST equally deep observations will be required. We make publicly available catalogues, atlases, and the improved ePSFs.

Nardiello, D. (ORCID:0000000311493659)↗