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At least 289 records · Page 16
All sourcesNASA NTRSDOE OSTI
DOE OSTI2022

Synthesis of perovskite polyhedron nanocrystals with equivalent facets and the controlled growth of Pt nanoparticles with differing surface concentration of oxidized Pt 4+ /Pt 2+ species

Co-existence of different surfaces in traditional polycrystalline heterogeneous catalysts imposes a challenge to induce different kinds of catalytic species and average reactivity. Supported metal/oxide model catalyst designed with equivalent well-defined surfaces and active species provides an opportunity to control the uniformity, maintain efficient activity, and understand catalytic mechanisms at the atomic and molecular levels. Herein, sub-20 nm perovskite-structure BaTiO 3 polyhedron nanocuboids and Zr-substituted rhombic dodecahedron nanocrystals were synthesized and employed as the oxide support for the subsequent uniform growth of 1–2 nm Pt nanoparticles. These Pt nanoparticles were well dispersed on the 12 equivalent (110) facets of BaTi 0.75 Zr 0.25 O 3 rhombic dodecahedra and on the 6 equivalent (100) facets of BaTiO 3 nanocuboids. The main active centers on the Pt/BaTi 0.75 Zr 0.25 O 3 catalysts in the oxidized surface layer of Pt (111) facets are Pt 4+ versus Pt 2+ , which is in contrast to the oxidized surface layer of the Pt (100) facets on the Pt/BaTiO 3 cuboids where there are a greater number of Pt 2+ species. Compared with Pt/BaTiO 3 nanocuboids, the Pt/BaTi 0.75 Zr 0.25 O 3 catalysts demonstrated higher CO catalytic oxidation activity with a lower apparent Arrhenius activation energy. Finally, this work advances our ability to synthesize metal/oxide model catalyst that offer equivalent facets and highly uniform active centers with reasonable surface area in order to gain insight in reaction mechanisms.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on PuPt4 by Materials Project

PuPt4 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Pu4+ is bonded in a 6-coordinate geometry to fourteen Pt1- atoms. There are a spread of Pu–Pt bond distances ranging from 2.90–3.33 Å. There are two inequivalent Pt1- sites. In the first Pt1- site, Pt1- is bonded in a 3-coordinate geometry to three equivalent Pu4+ and five Pt1- atoms. There are four shorter (2.68 Å) and one longer (2.69 Å) Pt–Pt bond lengths. In the second Pt1- site, Pt1- is bonded in a q6 geometry to four equivalent Pu4+ and six Pt1- atoms. Both Pt–Pt bond lengths are 2.70 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na4H4PdPt by Materials Project

Na4PtPdH4 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five H1- atoms to form a mixture of edge and corner-sharing NaH5 square pyramids. There are one shorter (2.40 Å) and four longer (2.58 Å) Na–H bond lengths. In the second Na1+ site, Na1+ is bonded to five H1- atoms to form a mixture of distorted edge and corner-sharing NaH5 square pyramids. There are one shorter (2.42 Å) and four longer (2.58 Å) Na–H bond lengths. Pt2- is bonded in a linear geometry to two equivalent H1- atoms. Both Pt–H bond lengths are 1.67 Å. Pd2+ is bonded in a linear geometry to two equivalent H1- atoms. Both Pd–H bond lengths are 1.70 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to five Na1+ and one Pt2- atom to form a mixture of edge and corner-sharing HNa5Pt octahedra. The corner-sharing octahedra tilt angles range from 0–7°. In the second H1- site, H1- is bonded to five Na1+ and one Pd2+ atom to form HNa5Pd octahedra that share corners with five equivalent HNa5Pd octahedra and edges with eight HNa5Pt octahedra. The corner-sharing octahedra tilt angles range from 0–6°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3Sn3Pt2 by Materials Project

Li3Pt2Sn3 crystallizes in the cubic Ia-3 space group. The structure is three-dimensional. there are three inequivalent Li sites. In the first Li site, Li is bonded in a 4-coordinate geometry to four Li, four Pt, and six equivalent Sn atoms. There are one shorter (2.77 Å) and three longer (2.93 Å) Li–Li bond lengths. There are one shorter (2.91 Å) and three longer (3.02 Å) Li–Pt bond lengths. All Li–Sn bond lengths are 3.11 Å. In the second Li site, Li is bonded in a 7-coordinate geometry to two equivalent Li, one Pt, and six equivalent Sn atoms. The Li–Pt bond length is 2.84 Å. There are a spread of Li–Sn bond distances ranging from 2.73–3.02 Å. In the third Li site, Li is bonded in a 6-coordinate geometry to two equivalent Li and six equivalent Sn atoms. All Li–Sn bond lengths are 2.86 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded in a 9-coordinate geometry to three Li and six equivalent Sn atoms. There are a spread of Pt–Sn bond distances ranging from 2.77–2.83 Å. In the second Pt site, Pt is bonded in a distorted body-centered cubic geometry to two equivalent Li and six equivalent Sn atoms. All Pt–Sn bond lengths are 2.85 Å. Sn is bonded in a 10-coordinate geometry to six Li and four Pt atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Single-Photon-Induced Electron Spin Polarization of Two Exchange-Coupled Stable Radicals

Transient electron paramagnetic resonance spectroscopy has been used to probe photoinduced electron spin polarization of a stable exchange-coupled organic biradical in a Pt(II) complex comprising 4,4'-di-tert-butyl-2,2'-bipyridine (bpy) and 3,6-bis(ethynyl-para-phenyl-nitronyl nitroxide)-o-catecholate (CAT(o-C$\equiv$C-Ph-NN) 2 ). Photoexcitation results in four unpaired spins in excited states of this complex, with spins being localized on each of the two radicals, CAT •+ and bpy •– . The four spins are all exchange-coupled in these excited states, and an off-diagonal matrix element in the CAT •+ -NN exchange allows for exchange-enhanced intersystem crossing to the 3 T 1a state, which possesses (bpy •– )Pt(CAT •+ ) chromophoric triplet character. Further, fast mixing between this 3 T 1a state and other thermally accessible excited LL'CT state(s) followed by fast relaxation provides spin polarization of the exchange-coupled NN radicals in the 3 S 0 ground state of the complex. Our results demonstrate that well-defined quantum states of a ground-state biradical can be initialized with single-photon excitation and have the potential for further spin manipulation directed toward quantum information science applications.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2023

High-entropy halide perovskite single crystals stabilized by mild chemistry

High entropy materials are excellent candidates for a range of functional materials but traditionally require high-temperature synthetic procedures over 1000°C and complex processing techniques such as hot rolling to form. One route to address the extreme synthetic requirements for high entropy materials should involve designing crystal structures with ionic bonding networks and low cohesive energies. Here, we develop room-temperature (20°C) and low temperature (80°C) solution synthesis procedures for a new class of metal-halide perovskite high entropy semiconductor (HES) single crystals. Due to the soft, ionic lattice nature of the class of metal-halide perovskites, these HES single crystals are designed on the cubic Cs 2 MCl 6 (M = Zr 4+ , Sn 4+ , Te 4+ , Hf 4+ , Re 4+ , Os 4+ , Ir 4+ , or Pt 4+ ) vacancy-ordered double perovskite structure from the self-assembly of stabilized complexes in multielement inks, namely free Cs + cations and five or six different isolated [MCl6] 2- anionic octahedral molecules well-mixed in strong hydrochloric acid. The resulting single-phase single crystals span two HES families of five- and six-elements occupying the M-site as a random alloy in near-equimolar ratios, with the overall Cs 2 MCl 6 crystal structure and stoichiometry maintained. In conclusion, the incorporation of various [MCl 6 ] 2- octahedral molecular orbitals disordered across the high entropy five- and six-element Cs 2 MCl 6 single crystals produces complex vibrational and electronic structures with energy transfer interactions between the confined exciton states of the five or six different isolated octahedral molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Non-linear flow modes of identified particles in Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}} $ = 5.02 TeV

The pT-differential non-linear flow modes, v 4,22 , v 5,32 , v 6,33 and v 6,222 for π ± , K ± , K$^0_S$ , $p + \bar{p}, Λ + \bar{Λ}$ and ϕ-meson have been measured for the first time at $\sqrt{s_{NN}}$ = 5.02 TeV in Pb-Pb collisions with the ALICE detector at the Large Hadron Collider. The results were obtained with a multi-particle technique, correlating the identified hadrons with reference charged particles from a different pseudorapidity region. These non-linear observables probe the contribution from the second and third order initial spatial anisotropy coefficients to higher flow harmonics. All the characteristic features observed in previous p T -differential anisotropic flow measurements for various particle species are also present in the non-linear flow modes, i.e. increase of magnitude with increasing centrality percentile, mass ordering at low p T and particle type grouping in the intermediate p T range. Hydrodynamical calculations (iEBE-VISHNU) that use different initial conditions and values of shear and bulk viscosity to entropy density ratios are confronted with the data at low transverse momenta. These calculations exhibit a better agreement with the anisotropic flow coefficients than the non-linear flow modes. These observations indicate that non-linear flow modes can provide additional discriminatory power in the study of initial conditions as well as new stringent constraints to hydrodynamical calculations.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2020

Materials Data on Na2PtC2 by Materials Project

Na2PtC2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to three equivalent Pt2- and three equivalent C atoms. All Na–Pt bond lengths are 2.99 Å. All Na–C bond lengths are 2.69 Å. Pt2- is bonded in a distorted body-centered cubic geometry to six equivalent Na1+ and two equivalent C atoms. Both Pt–C bond lengths are 1.98 Å. C is bonded in a linear geometry to three equivalent Na1+, one Pt2-, and one C atom. The C–C bond length is 1.27 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2PtC2 by Materials Project

K2PtC2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to three equivalent Pt2- and three equivalent C atoms. All K–Pt bond lengths are 3.32 Å. All K–C bond lengths are 3.04 Å. Pt2- is bonded in a distorted linear geometry to six equivalent K1+ and two equivalent C atoms. Both Pt–C bond lengths are 1.98 Å. C is bonded in a linear geometry to three equivalent K1+, one Pt2-, and one C atom. The C–C bond length is 1.28 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2Sb2Pt by Materials Project

Cs2PtSb2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Cs1+ sites. In the first Cs1+ site, Cs1+ is bonded in a distorted L-shaped geometry to two equivalent Sb atoms. Both Cs–Sb bond lengths are 3.84 Å. In the second Cs1+ site, Cs1+ is bonded in a 6-coordinate geometry to two equivalent Pt2- and two equivalent Sb atoms. Both Cs–Pt bond lengths are 3.47 Å. Both Cs–Sb bond lengths are 4.00 Å. Pt2- is bonded to two equivalent Cs1+ and four equivalent Sb atoms to form face-sharing PtCs2Sb4 octahedra. All Pt–Sb bond lengths are 2.69 Å. Sb is bonded in a 2-coordinate geometry to two Cs1+, two equivalent Pt2-, and one Sb atom. The Sb–Sb bond length is 2.84 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Fabrication of Large-Area Metal-on-Carbon Catalytic Condensers for Programmable Catalysis

Catalytic condensers stabilize charge on either side of a high-k dielectric film to modulate the electronic states of a catalytic layer for the electronic control of surface reactions. Here, carbon sputtering provided for fast, large-scale fabrication of metal–carbon catalytic condensers required for industrial application. Carbon films were sputtered on HfO 2 dielectric/p-type Si with different thicknesses (1, 3, 6, and 10 nm), and the enhancement of conductance and capacitance of carbon films was observed upon increasing the carbon thickness following thermal treatment at 400 °C. After Pt deposition on the carbon films, the Pt catalytic condenser exhibited a high capacitance of ∼210 nF/cm 2 that was maintained at a frequency ∼1000 Hz, satisfying the requirement for a dynamic catalyst to implement catalytic resonance. Temperature-programmed desorption of carbon monoxide yielded CO desorption peaks that shifted in temperature with the varying potential applied to the condenser (−6 or +6 V), indicating a shift in the binding energy of carbon monoxide on the Pt condenser surface. A substantial increase in capacitance (∼2000 nF/cm 2 ) of the Pt-on-carbon devices was observed at elevated temperatures of 400 °C that can modulate ∼10% of charge per metal atom when 10 V potential was applied. A large catalytic condenser of 42 cm 2 area Pt/C/HfO 2 /Si exhibited a high capacitance of 9393 nF with a low leakage current/capacitive current ratio (<0.1), demonstrating the practicality and versatility of the facile, large-scale fabrication method for metal–carbon catalytic condensers.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Ce(PPt2)2 by Materials Project

Ce(Pt2P)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ce4+ is bonded in a 9-coordinate geometry to nine Pt2- atoms. There are a spread of Ce–Pt bond distances ranging from 3.10–3.25 Å. There are four inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 3-coordinate geometry to four equivalent Ce4+ and three P2+ atoms. There are a spread of Pt–P bond distances ranging from 2.34–2.45 Å. In the second Pt2- site, Pt2- is bonded in a 2-coordinate geometry to one Ce4+ and three equivalent P2+ atoms. There are two shorter (2.35 Å) and one longer (2.69 Å) Pt–P bond lengths. In the third Pt2- site, Pt2- is bonded in a 12-coordinate geometry to two equivalent Ce4+ and three P2+ atoms. There are two shorter (2.41 Å) and one longer (2.81 Å) Pt–P bond lengths. In the fourth Pt2- site, Pt2- is bonded in a 2-coordinate geometry to two equivalent Ce4+ and two P2+ atoms. There are one shorter (2.33 Å) and one longer (2.40 Å) Pt–P bond lengths. There are two inequivalent P2+ sites. In the first P2+ site, P2+ is bonded in a 5-coordinate geometry to five Pt2- atoms. In the second P2+ site, P2+ is bonded in a 6-coordinate geometry to six Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ti11Ni9Pt4 by Materials Project

Ti11Pt4Ni9 is Magnesium tetraboride-derived structured and crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are seven inequivalent Ti sites. In the first Ti site, Ti is bonded in a distorted hexagonal bipyramidal geometry to four Pt and four Ni atoms. There are two shorter (2.65 Å) and two longer (2.66 Å) Ti–Pt bond lengths. All Ti–Ni bond lengths are 2.52 Å. In the second Ti site, Ti is bonded in a 8-coordinate geometry to two equivalent Pt and six Ni atoms. Both Ti–Pt bond lengths are 2.63 Å. There are a spread of Ti–Ni bond distances ranging from 2.52–2.54 Å. In the third Ti site, Ti is bonded in a 8-coordinate geometry to two equivalent Pt and six Ni atoms. Both Ti–Pt bond lengths are 2.64 Å. There are a spread of Ti–Ni bond distances ranging from 2.50–2.57 Å. In the fourth Ti site, Ti is bonded in a 8-coordinate geometry to four Pt and four Ni atoms. There are a spread of Ti–Pt bond distances ranging from 2.65–2.68 Å. There are a spread of Ti–Ni bond distances ranging from 2.48–2.52 Å. In the fifth Ti site, Ti is bonded in a 9-coordinate geometry to three Pt and six Ni atoms. There are a spread of Ti–Pt bond distances ranging from 3.01–3.07 Å. There are a spread of Ti–Ni bond distances ranging from 2.48–2.69 Å. In the sixth Ti site, Ti is bonded in a 9-coordinate geometry to three Pt and six Ni atoms. There are a spread of Ti–Pt bond distances ranging from 2.84–2.91 Å. There are a spread of Ti–Ni bond distances ranging from 2.37–2.73 Å. In the seventh Ti site, Ti is bonded in a 7-coordinate geometry to one Pt and seven Ni atoms. The Ti–Pt bond length is 3.19 Å. There are a spread of Ti–Ni bond distances ranging from 2.57–2.69 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded in a 4-coordinate geometry to eight Ti, two Pt, and four Ni atoms. There are one shorter (3.02 Å) and one longer (3.03 Å) Pt–Pt bond lengths. There are a spread of Pt–Ni bond distances ranging from 2.77–2.82 Å. In the second Pt site, Pt is bonded in a 4-coordinate geometry to seven Ti, one Pt, and four Ni atoms. There are a spread of Pt–Ni bond distances ranging from 2.77–2.84 Å. There are five inequivalent Ni sites. In the first Ni site, Ni is bonded in a 6-coordinate geometry to six Ti and two equivalent Ni atoms. Both Ni–Ni bond lengths are 2.77 Å. In the second Ni site, Ni is bonded in a 11-coordinate geometry to seven Ti, two Pt, and two Ni atoms. The Ni–Ni bond length is 2.61 Å. In the third Ni site, Ni is bonded in a 10-coordinate geometry to seven Ti, two Pt, and one Ni atom. In the fourth Ni site, Ni is bonded in a 10-coordinate geometry to seven Ti, two Pt, and one Ni atom. The Ni–Ni bond length is 2.58 Å. In the fifth Ni site, Ni is bonded in a 10-coordinate geometry to seven Ti, two Pt, and one Ni atom. The Ni–Ni bond length is 2.60 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on H2Os4Pt(CO)15 by Materials Project

Os3PtH2(CO)11Os(CO)4 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four Os(CO)4 clusters and four Os3PtH2(CO)11 clusters. In each Os(CO)4 cluster, Os+1.50- is bonded in a rectangular see-saw-like geometry to four C+2.40+ atoms. There are a spread of Os–C bond distances ranging from 1.90–1.95 Å. There are four inequivalent C+2.40+ sites. In the first C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the second C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the third C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the fourth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In each Os3PtH2(CO)11 cluster, there are three inequivalent Os+1.50- sites. In the first Os+1.50- site, Os+1.50- is bonded in a 4-coordinate geometry to three C+2.40+ and one H1+ atom. There are a spread of Os–C bond distances ranging from 1.90–1.92 Å. The Os–H bond length is 1.86 Å. In the second Os+1.50- site, Os+1.50- is bonded in a 4-coordinate geometry to three C+2.40+ and one H1+ atom. There is one shorter (1.90 Å) and two longer (1.91 Å) Os–C bond length. The Os–H bond length is 1.86 Å. In the third Os+1.50- site, Os+1.50- is bonded in a 6-coordinate geometry to one Pt2-, three C+2.40+, and two H1+ atoms. The Os–Pt bond length is 2.76 Å. There is two shorter (1.91 Å) and one longer (1.92 Å) Os–C bond length. There is one shorter (1.81 Å) and one longer (1.82 Å) Os–H bond length. Pt2- is bonded in a distorted water-like geometry to one Os+1.50- and two C+2.40+ atoms. There is one shorter (1.91 Å) and one longer (1.92 Å) Pt–C bond length. There are eleven inequivalent C+2.40+ sites. In the first C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Pt2- and one O2- atom. The C–O bond length is 1.16 Å. In the second C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Pt2- and one O2- atom. The C–O bond length is 1.16 Å. In the third C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the fourth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the fifth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the sixth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the seventh C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the eighth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the ninth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the tenth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the eleventh C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a bent 120 degrees geometry to two Os+1.50- atoms. In the second H1+ site, H1+ is bonded in a water-like geometry to two Os+1.50- atoms. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Si3Pt2 by Materials Project

Pt2Si3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pt2- is bonded in a 8-coordinate geometry to seven Si+1.33+ atoms. There are a spread of Pt–Si bond distances ranging from 2.44–2.65 Å. There are two inequivalent Si+1.33+ sites. In the first Si+1.33+ site, Si+1.33+ is bonded to four equivalent Pt2- atoms to form a mixture of corner and edge-sharing SiPt4 tetrahedra. In the second Si+1.33+ site, Si+1.33+ is bonded in a 6-coordinate geometry to six equivalent Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm3Sb4Pt7 by Materials Project

Sm3Pt7Sb4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Sm+2.67+ sites. In the first Sm+2.67+ site, Sm+2.67+ is bonded to six Pt2- atoms to form SmPt6 octahedra that share corners with two equivalent PtSm4Sb2Pt6 cuboctahedra and edges with two equivalent SmPt6 octahedra. There are four shorter (3.25 Å) and two longer (3.34 Å) Sm–Pt bond lengths. In the second Sm+2.67+ site, Sm+2.67+ is bonded in a 8-coordinate geometry to eight Pt2- atoms. There are a spread of Sm–Pt bond distances ranging from 2.94–3.21 Å. There are four inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 9-coordinate geometry to four Sm+2.67+, one Pt2-, and four Sb+1.50+ atoms. The Pt–Pt bond length is 2.97 Å. There are a spread of Pt–Sb bond distances ranging from 2.60–2.83 Å. In the second Pt2- site, Pt2- is bonded in a 9-coordinate geometry to three Sm+2.67+, three Pt2-, and three equivalent Sb+1.50+ atoms. All Pt–Pt bond lengths are 2.83 Å. There are two shorter (2.64 Å) and one longer (2.78 Å) Pt–Sb bond lengths. In the third Pt2- site, Pt2- is bonded to four equivalent Sm+2.67+, six Pt2-, and two equivalent Sb+1.50+ atoms to form distorted PtSm4Sb2Pt6 cuboctahedra that share corners with two equivalent SmPt6 octahedra and faces with two equivalent PtSm4Sb2Pt6 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. All Pt–Pt bond lengths are 2.95 Å. Both Pt–Sb bond lengths are 3.04 Å. In the fourth Pt2- site, Pt2- is bonded in a 10-coordinate geometry to two equivalent Sm+2.67+, five Pt2-, and three Sb+1.50+ atoms. There are two shorter (2.72 Å) and one longer (3.00 Å) Pt–Sb bond lengths. There are two inequivalent Sb+1.50+ sites. In the first Sb+1.50+ site, Sb+1.50+ is bonded in a 6-coordinate geometry to six Pt2- atoms. In the second Sb+1.50+ site, Sb+1.50+ is bonded in a 5-coordinate geometry to five Pt2- atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2026

ENDF/B-VIII.1: Updated Nuclear Reaction Data Library for Science and Applications

The ENDF/B-VIII.1 library is the newest recommended evaluated nuclear data file by the Cross Section Evaluation Working Group (CSEWG) for use in nuclear science and technology applications, and incorporates advances made in the six years since the release of ENDF/B-VIII.0. Among key advances made are that the 239 Pu file was reevaluated by a joint international effort and that updated 16,18 O, 19 F, 28–30 Si, 50–54 Cr, 55 Mn, 54,56,57 Fe, 63,65 Cu, 139 La, 233,235,238 U, and 240,241 Pu neutron nuclear data from the IAEA coordinated INDEN collaboration were adopted. Over 60 neutron dosimetry cross sections were adopted from the IAEA's IRDFF-II library. In addition, the new library includes significant changes for 3 He, 6 Li, 9 Be, 51 V, 88 Sr, 103 Rh, 140,142 Ce, Dy, 181 Ta, Pt, 206–208 Pb, and 234,236 U neutron data, and new nuclear data for the photonuclear, charged-particle and atomic sublibraries. Numerous thermal neutron scattering kernels were reevaluated or provided for the very first time. On the covariance side, work was undertaken to introduce better uncertainty quantification standards and testing for nuclear data covariances. The significant effort to reevaluate important nuclides has reduced bias in the simulations of many integral experiments with particular progress noted for fluorine, copper, and stainless steel containing benchmarks. Data issues hindered the successful deployment of the previous ENDF/B-VIII.0 for commercial nuclear power applications in high burnup situations. These issues were addressed by improving the 238 U and 239,240,241 Pu evaluated data in the resonance region. The new library performance as a function of burnup is similar to the reference ENDF/B-VII.1 library.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗