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At least 73 records · Page 4
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sm(Sn2Rh)2 by Materials Project

Sm(RhSn2)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to six Sn atoms. There are a spread of Sm–Sn bond distances ranging from 3.18–3.22 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Rh–Sn bond distances ranging from 2.71–2.89 Å. In the second Rh site, Rh is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Rh–Sn bond distances ranging from 2.72–2.82 Å. There are four inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to two equivalent Sm and four Rh atoms. In the second Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Sm and three equivalent Rh atoms. In the third Sn site, Sn is bonded in a 3-coordinate geometry to two equivalent Sm and three equivalent Rh atoms. In the fourth Sn site, Sn is bonded to four Rh atoms to form a mixture of distorted corner and edge-sharing SnRh4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Re2Si)2 by Materials Project

Sm(Re2Si)2 crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Sm is bonded in a 6-coordinate geometry to twelve equivalent Re and six equivalent Si atoms. There are four shorter (3.25 Å) and eight longer (3.37 Å) Sm–Re bond lengths. There are four shorter (3.03 Å) and two longer (3.07 Å) Sm–Si bond lengths. Re is bonded to three equivalent Sm, six equivalent Re, and three equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing ReSm3Re6Si3 cuboctahedra. There are a spread of Re–Re bond distances ranging from 2.63–2.83 Å. There are one shorter (2.46 Å) and two longer (2.58 Å) Re–Si bond lengths. Si is bonded in a 9-coordinate geometry to three equivalent Sm and six equivalent Re atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(ZnGa)2 by Materials Project

Sm(ZnGa)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Zn and eight equivalent Ga atoms. All Sm–Zn bond lengths are 3.42 Å. All Sm–Ga bond lengths are 3.20 Å. Zn is bonded to four equivalent Sm and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing ZnSm4Ga4 tetrahedra. All Zn–Ga bond lengths are 2.56 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Zn, and one Ga atom. The Ga–Ga bond length is 2.46 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Sm 2 Ru 3 Sn 5 : A Noncentrosymmetric Cubic Member of the Ln 2 M 3 X 5 Family

An optimized synthetic method is presented for Sm 2 Ru 3 Sn 5 and investigate its physical properties and electronic structure. Sm 2 Ru 3 Sn 5 is prepared by arc-melting stoichiometric ratios of the elements and is confirmed by single crystal and powder X-ray diffraction. An antiferromagnetic transition is observed at T N = 3.8 K. A modified Curie-Weiss fit to the data in the range 50–150 K yields a Curie-Weiss temperature: θ CW = −36.6 K and an effective magnetic moment: μ eff = 0.83 μ B , in agreement with a Sm 3+ oxidation state. Field-dependent magnetization up to H = 7 T at 2 K shows a maximum response of 0.06 μ B , which is significantly lower than the expected Sm 3+ saturation moment (0.71 μ B ). Resistivity measurements indicate metallic behavior, and analysis of the magnetic entropy from the heat capacity reveals a doublet ground state due to crystal electric field splitting. The electronic structure and density of states are calculated with density function theory and further supported by the local density approximation with dynamical mean-field theory. Finally, the experimental and computational results highlight localized Sm 3+ moments and suggest a possible interplay between Ruddelman–Kitel–Kasuya–Yosida and Kondo interactions, positioning Sm 2 Ru 3 Sn 5 as a promising material for studying topology and complex physical phenomena.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2025

Minimizing particle aggregation in Sm 2 Fe 17 N 3 powders: A CaO-assisted reduction-diffusion approach

We report a novel synthesis of Sm 2 Fe 17 N 3 powders using a CaO-assisted reduction-diffusion (RD) approach. CaO plays a crucial role during mechanochemical processing – acting both as a dispersant and a surface coating agent, which helps to prevent agglomeration due to sintering of Sm 2 Fe 17 particles during the RD step. Together with the added dispersant, the CaO by-product formed during RD can be easily removed in the washing step resulting in fewer aggregated Sm 2 Fe 17 N 3 particles and lower oxygen contamination in the final product. The impact of varying CaO amounts was examined, and synthesis conditions were optimized to achieve phase-pure Sm 2 Fe 17 N 3 powders with less aggregation of magnetic particles. The powders synthesized with addition of 1 wt% CaO as dispersant exhibited the highest hard-magnetic properties: a coercivity (H c ) of 10.7 kOe and a maximum energy product ((BH) max ) of 17.3 MGOe. By densifying the Sm 2 Fe 17 N 3 powders using high-pressure spark plasma sintering, a bulk magnet with a (BH) max of 21.1 MGOe with 88 % of theoretical density was produced. In conclusion, reducing aggregation of the Sm 2 Fe 17 N 3 increases coercivity and remanence of these magnets.

36 MATERIALS SCIENCE↗
DOE OSTI2024

LITE-SM: A Light Sheet Illuminator Compatible with Super Resolution and Single Molecule Imaging

The LITE-SM (hereinafter referred to as the Tilt-SM) is a light sheet illumination system purpose-built for single molecule (SM) imaging. SM imaging is a fluorescence imaging technique where individual molecules can be tracked in living cells/tissues in real time allowing for unprecedented insights into the intracellular dynamics of these molecules. The innovative all-mirror optical design greatly reduces/eliminates the aberrations that plague lens-based designs. This iteration of the Tilt-SM has significantly better optical performance then its predecessor with over 10x increase in optical power at the sample, allowing for the use of much smaller and more cost-effective lasers then the original Phase 1 system. Excellent STORM imaging as well as SM tracking has been achieved, satisfying the key objectives of this study.

59 BASIC BIOLOGICAL SCIENCES↗
DOE OSTI2020

Materials Data on Sm(CuGe)2 by Materials Project

SmCu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent Ge atoms. All Sm–Cu bond lengths are 3.30 Å. All Sm–Ge bond lengths are 3.16 Å. Cu is bonded to four equivalent Sm and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing CuSm4Ge4 tetrahedra. All Cu–Ge bond lengths are 2.45 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(GeRu)2 by Materials Project

SmRu2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Ru and eight equivalent Ge atoms. All Sm–Ru bond lengths are 3.30 Å. All Sm–Ge bond lengths are 3.31 Å. Ru is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Ge atoms. All Ru–Ge bond lengths are 2.45 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Ru, and one Ge atom. The Ge–Ge bond length is 2.64 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(FeGe)2 by Materials Project

SmFe2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Fe and eight equivalent Ge atoms. All Sm–Fe bond lengths are 3.35 Å. All Sm–Ge bond lengths are 3.11 Å. Fe is bonded to four equivalent Sm and four equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing FeSm4Ge4 tetrahedra. All Fe–Ge bond lengths are 2.44 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Fe, and one Ge atom. The Ge–Ge bond length is 2.58 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(CoGe)2 by Materials Project

SmCo2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Sm–Co bond lengths are 3.25 Å. All Sm–Ge bond lengths are 3.13 Å. Co is bonded to four equivalent Sm and four equivalent Ge atoms to form a mixture of distorted corner, edge, and face-sharing CoSm4Ge4 tetrahedra. All Co–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.67 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(AgGe)2 by Materials Project

SmAg2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Ag and eight equivalent Ge atoms. All Sm–Ag bond lengths are 3.52 Å. All Sm–Ge bond lengths are 3.27 Å. Ag is bonded to four equivalent Sm, four equivalent Ag, and four equivalent Ge atoms to form a mixture of distorted face, edge, and corner-sharing AgSm4Ag4Ge4 cuboctahedra. All Ag–Ag bond lengths are 3.04 Å. All Ag–Ge bond lengths are 2.66 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Ag, and one Ge atom. The Ge–Ge bond length is 2.44 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(ClO4)3 by Materials Project

Sm(O4Cl)3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Sm is bonded in a 9-coordinate geometry to nine O atoms. There are six shorter (2.46 Å) and three longer (2.49 Å) Sm–O bond lengths. There are three inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the second O site, O is bonded in a bent 150 degrees geometry to one Sm and one Cl atom. The O–Cl bond length is 1.47 Å. In the third O site, O is bonded in a bent 150 degrees geometry to one Sm and one Cl atom. The O–Cl bond length is 1.47 Å. Cl is bonded in a tetrahedral geometry to four O atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(BRh)4 by Materials Project

SmRh4B4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to twelve equivalent Rh and twelve equivalent B atoms. There are four shorter (2.99 Å) and eight longer (3.19 Å) Sm–Rh bond lengths. There are eight shorter (3.05 Å) and four longer (3.17 Å) Sm–B bond lengths. Rh is bonded in a 5-coordinate geometry to three equivalent Sm and five equivalent B atoms. There are a spread of Rh–B bond distances ranging from 2.22–2.26 Å. B is bonded in a 6-coordinate geometry to three equivalent Sm, five equivalent Rh, and one B atom. The B–B bond length is 1.81 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Cd10Pd)2 by Materials Project

Sm(PdCd10)2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Sm is bonded in a 4-coordinate geometry to sixteen Cd atoms. There are four shorter (3.45 Å) and twelve longer (3.47 Å) Sm–Cd bond lengths. Pd is bonded to twelve Cd atoms to form PdCd12 cuboctahedra that share corners with six equivalent PdCd12 cuboctahedra, edges with eighteen equivalent CdSmCd10Pd cuboctahedra, and faces with six equivalent CdSmCd10Pd cuboctahedra. There are six shorter (2.83 Å) and six longer (3.14 Å) Pd–Cd bond lengths. There are three inequivalent Cd sites. In the first Cd site, Cd is bonded in a distorted linear geometry to two equivalent Pd and six equivalent Cd atoms. There are two shorter (3.00 Å) and four longer (3.16 Å) Cd–Cd bond lengths. In the second Cd site, Cd is bonded to one Sm, one Pd, and ten Cd atoms to form distorted CdSmCd10Pd cuboctahedra that share corners with fifteen equivalent CdSmCd10Pd cuboctahedra, edges with two equivalent CdSmCd10Pd cuboctahedra, edges with three equivalent PdCd12 cuboctahedra, a faceface with one PdCd12 cuboctahedra, and faces with fifteen equivalent CdSmCd10Pd cuboctahedra. There are a spread of Cd–Cd bond distances ranging from 2.91–3.37 Å. In the third Cd site, Cd is bonded in a distorted linear geometry to two equivalent Sm and twelve equivalent Cd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Cd10Ni)2 by Materials Project

Sm(NiCd10)2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Sm is bonded in a 4-coordinate geometry to sixteen Cd atoms. There are four shorter (3.41 Å) and twelve longer (3.45 Å) Sm–Cd bond lengths. Ni is bonded to twelve Cd atoms to form NiCd12 cuboctahedra that share corners with six equivalent NiCd12 cuboctahedra, edges with eighteen equivalent CdSmCd10Ni cuboctahedra, and faces with six equivalent CdSmCd10Ni cuboctahedra. There are six shorter (2.79 Å) and six longer (3.08 Å) Ni–Cd bond lengths. There are three inequivalent Cd sites. In the first Cd site, Cd is bonded in a distorted linear geometry to two equivalent Ni and ten Cd atoms. There are a spread of Cd–Cd bond distances ranging from 2.97–3.12 Å. In the second Cd site, Cd is bonded to one Sm, one Ni, and ten Cd atoms to form distorted CdSmCd10Ni cuboctahedra that share corners with fifteen equivalent CdSmCd10Ni cuboctahedra, edges with two equivalent CdSmCd10Ni cuboctahedra, edges with three equivalent NiCd12 cuboctahedra, a faceface with one NiCd12 cuboctahedra, and faces with fifteen equivalent CdSmCd10Ni cuboctahedra. There are a spread of Cd–Cd bond distances ranging from 2.90–3.35 Å. In the third Cd site, Cd is bonded in a distorted linear geometry to two equivalent Sm and twelve equivalent Cd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm by Materials Project

Sm is Copper structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sm is bonded to twelve equivalent Sm atoms to form a mixture of corner, edge, and face-sharing SmSm12 cuboctahedra. All Sm–Sm bond lengths are 3.65 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm by Materials Project

Sm is Magnesium structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sm is bonded to twelve equivalent Sm atoms to form a mixture of face, edge, and corner-sharing SmSm12 cuboctahedra. There are six shorter (3.62 Å) and six longer (3.68 Å) Sm–Sm bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

The formation and evolution of the Moon’s crust inferred from the Sm-Nd isotopic systematics of highlands rocks

Ages determined for magnesian and ferroan anorthosite crustal rock suites overlap, suggesting they formed contemporaneously about 4.3–4.5 Ga. A notable exception is the Sm-Nd age previously determined on Mg-suite gabbronorite 67667 which is at least 100 Ma younger than the youngest ferroan anorthosite. New chronologic measurements of 67667 presented here yield concordant Sm-Nd and Rb-Sr mineral isochron ages of 4349 ± 31 Ma and 4368 ± 67 Ma, suggesting the sample is older than previous estimates. Furthermore, a whole rock Sm-Nd isochron of Mg-suite rocks from the Apollo 14, 15, 16, and 17 landing sites yields an age of 4348 ± 25 Ma, indicating that Mg-suite magmatism was widespread and roughly contemporaneous on the lunar nearside. Here, analysis of Sm-Nd internal isochron ages confirms that Mg-suite magmatism was restricted to a period between about 4.33 and 4.35 Ga at the Apollo 14, 15, 16, and 17 landing sites and was synchronous with magmatism at the Apollo 16 site associated with the ferroan anorthosite suite between 4.35 and 4.37 Ga. Magnesian- and ferroan anorthosite suite rocks with ages younger than ~4.33 Ga appear to have experienced slow cooling in the deep lunar interior, so that the ages record when the samples cooled below the closure temperature of the Sm-Nd isotopic system and not the time they crystallized.

79 ASTRONOMY AND ASTROPHYSICS↗