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At least 1,495 records · Page 83
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Understanding Type Ia Supernova Distance Biases by Simulating Spectral Variations

In the next decade, transient searches from the Vera C. Rubin Observatory and the Nancy Grace Roman Space Telescope will increase the sample of known Type Ia supernovae (SNe Ia) from ~10 3 to 10 5 . With this reduction of statistical uncertainties on cosmological measurements, new methods are needed to reduce systematic uncertainties. Here, characterizing the underlying spectroscopic evolution of SN Ia remains a major systematic uncertainty in current cosmological analyses, motivating a new simulation tool for the next era of SN Ia cosmology: Build Your Own Spectral Energy Distribution (byosed). byosed is used within the SNANA framework to simulate light curves by applying spectral variations to model SEDs, enabling flexible testing of possible systematic shifts in SN Ia distance measurements. We test the framework by comparing a nominal Roman SN Ia survey simulation using a baseline SED model to simulations using SEDs perturbed with byosed, and investigating the impact of ignoring specific SED features in the analysis. These features include semiempirical models of two possible, predicted relationships: between SN ejecta velocity and light-curve observables, and a redshift-dependent relationship between SN Hubble residuals and host-galaxy mass. We analyze each byosed simulation using the SALT2 and BEAMS with Bias Corrections framework, and estimate changes in the measured value of the dark-energy equation-of-state parameter, w. We find a difference of Δw = –0.023 for SN velocity and Δw = 0.021 for redshift-evolving host mass when compared to simulations without these features. By using byosed for SN Ia cosmology simulations, future analyses (e.g., the Rubin and Roman SN Ia samples) will have greater flexibility to constrain or reduce such SN Ia modeling uncertainties.

79 ASTRONOMY AND ASTROPHYSICS↗
DOE OSTI2020

Materials Data on Sn4As3 by Materials Project

Sn4As3 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Sn4As3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Sn+2.25+ sites. In the first Sn+2.25+ site, Sn+2.25+ is bonded in a distorted T-shaped geometry to three equivalent As3- atoms. All Sn–As bond lengths are 2.79 Å. In the second Sn+2.25+ site, Sn+2.25+ is bonded to six As3- atoms to form a mixture of edge and corner-sharing SnAs6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (2.89 Å) and three longer (3.08 Å) Sn–As bond lengths. There are two inequivalent As3- sites. In the first As3- site, As3- is bonded to six Sn+2.25+ atoms to form a mixture of edge and corner-sharing AsSn6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second As3- site, As3- is bonded to six equivalent Sn+2.25+ atoms to form a mixture of edge and corner-sharing AsSn6 octahedra. The corner-sharing octahedral tilt angles are 5°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ErAgSn by Materials Project

ErAgSn crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Er is bonded in a 11-coordinate geometry to six equivalent Ag and five Sn atoms. There are two shorter (3.27 Å) and four longer (3.56 Å) Er–Ag bond lengths. There are four shorter (3.14 Å) and one longer (3.18 Å) Er–Sn bond lengths. Ag is bonded to six equivalent Er, two equivalent Ag, and four Sn atoms to form a mixture of distorted face, edge, and corner-sharing AgEr6Ag2Sn4 cuboctahedra. Both Ag–Ag bond lengths are 3.15 Å. There are two shorter (2.84 Å) and two longer (2.89 Å) Ag–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to three equivalent Er and six equivalent Ag atoms. In the second Sn site, Sn is bonded in a 9-coordinate geometry to six equivalent Er and three equivalent Ag atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Co3(SnS)2 by Materials Project

Co3Sn2S2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Co is bonded in a distorted linear geometry to four Sn and two equivalent S atoms. There are two shorter (2.69 Å) and two longer (2.70 Å) Co–Sn bond lengths. Both Co–S bond lengths are 2.16 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to six equivalent Co and two equivalent S atoms to form SnCo6S2 hexagonal bipyramids that share corners with six equivalent SnCo6S2 hexagonal bipyramids and edges with six equivalent SnCo6 cuboctahedra. Both Sn–S bond lengths are 2.89 Å. In the second Sn site, Sn is bonded to six equivalent Co atoms to form distorted SnCo6 cuboctahedra that share corners with six equivalent SnCo6 cuboctahedra and edges with six equivalent SnCo6S2 hexagonal bipyramids. S is bonded in a 4-coordinate geometry to three equivalent Co and one Sn atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(Sn3Ru2)2 by Materials Project

Sm(Ru2Sn3)2 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Sm is bonded in a 12-coordinate geometry to four equivalent Ru and twelve Sn atoms. All Sm–Ru bond lengths are 3.30 Å. There are a spread of Sm–Sn bond distances ranging from 3.39–3.77 Å. Ru is bonded in a 7-coordinate geometry to one Sm, two equivalent Ru, and six Sn atoms. Both Ru–Ru bond lengths are 2.85 Å. There are a spread of Ru–Sn bond distances ranging from 2.60–2.80 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to two equivalent Sm and four equivalent Ru atoms. In the second Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Sm and four equivalent Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(Sn3Ru2)2 by Materials Project

CeRu4Sn6 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Ce is bonded in a 12-coordinate geometry to four equivalent Ru and twelve Sn atoms. All Ce–Ru bond lengths are 3.27 Å. There are a spread of Ce–Sn bond distances ranging from 3.38–3.78 Å. Ru is bonded in a 7-coordinate geometry to one Ce and six Sn atoms. There are a spread of Ru–Sn bond distances ranging from 2.61–2.78 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to two equivalent Ce and four equivalent Ru atoms. In the second Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Ce and four equivalent Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiCeSn2 by Materials Project

LiCeSn2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Li is bonded in a 5-coordinate geometry to four equivalent Ce and five Sn atoms. All Li–Ce bond lengths are 3.49 Å. There are a spread of Li–Sn bond distances ranging from 2.52–2.68 Å. Ce is bonded in a 4-coordinate geometry to four equivalent Li and ten Sn atoms. There are a spread of Ce–Sn bond distances ranging from 3.43–3.65 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to four equivalent Li and four equivalent Ce atoms to form a mixture of distorted face and edge-sharing SnLi4Ce4 tetrahedra. In the second Sn site, Sn is bonded in a distorted single-bond geometry to one Li and six equivalent Ce atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd(Sn3Ru2)2 by Materials Project

Gd(Ru2Sn3)2 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Gd is bonded in a 12-coordinate geometry to four equivalent Ru and twelve Sn atoms. All Gd–Ru bond lengths are 3.29 Å. There are a spread of Gd–Sn bond distances ranging from 3.38–3.78 Å. Ru is bonded in a 7-coordinate geometry to one Gd and six Sn atoms. There are a spread of Ru–Sn bond distances ranging from 2.60–2.81 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to two equivalent Gd and four equivalent Ru atoms. In the second Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Gd and four equivalent Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn4P3 by Materials Project

Sn4P3 crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Sn4P3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Sn+2.25+ sites. In the first Sn+2.25+ site, Sn+2.25+ is bonded to six P3- atoms to form a mixture of corner and edge-sharing SnP6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (2.79 Å) and three longer (2.99 Å) Sn–P bond lengths. In the second Sn+2.25+ site, Sn+2.25+ is bonded in a distorted T-shaped geometry to three equivalent P3- atoms. All Sn–P bond lengths are 2.68 Å. There are two inequivalent P3- sites. In the first P3- site, P3- is bonded to six equivalent Sn+2.25+ atoms to form a mixture of corner and edge-sharing PSn6 octahedra. The corner-sharing octahedral tilt angles are 5°. In the second P3- site, P3- is bonded to six Sn+2.25+ atoms to form a mixture of corner and edge-sharing PSn6 octahedra. The corner-sharing octahedral tilt angles are 5°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn5(BIr3)2 by Materials Project

Sn5(Ir3B)2 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Ir is bonded in a 7-coordinate geometry to two B and five Sn atoms. There are one shorter (2.19 Å) and one longer (2.22 Å) Ir–B bond lengths. There are a spread of Ir–Sn bond distances ranging from 2.72–2.91 Å. There are two inequivalent B sites. In the first B site, B is bonded in a distorted pentagonal pyramidal geometry to six equivalent Ir atoms. In the second B site, B is bonded in a 6-coordinate geometry to six equivalent Ir and three equivalent Sn atoms. All B–Sn bond lengths are 2.71 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Ir atoms. In the second Sn site, Sn is bonded in a 7-coordinate geometry to six equivalent Ir and one B atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K5SnBi3 by Materials Project

K5SnBi3 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are five inequivalent K sites. In the first K site, K is bonded to four Bi atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. There are a spread of K–Bi bond distances ranging from 3.61–3.83 Å. In the second K site, K is bonded in a distorted see-saw-like geometry to four Bi atoms. There are a spread of K–Bi bond distances ranging from 3.62–3.86 Å. In the third K site, K is bonded in a 4-coordinate geometry to one Sn and three Bi atoms. The K–Sn bond length is 3.91 Å. There are a spread of K–Bi bond distances ranging from 3.66–3.79 Å. In the fourth K site, K is bonded to four Bi atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. There are a spread of K–Bi bond distances ranging from 3.60–3.63 Å. In the fifth K site, K is bonded in a 6-coordinate geometry to two equivalent Sn and four Bi atoms. There are one shorter (3.89 Å) and one longer (3.94 Å) K–Sn bond lengths. There are a spread of K–Bi bond distances ranging from 3.71–4.07 Å. Sn is bonded in a 7-coordinate geometry to three K and four Bi atoms. There are a spread of Sn–Bi bond distances ranging from 2.96–3.05 Å. There are three inequivalent Bi sites. In the first Bi site, Bi is bonded in a 8-coordinate geometry to seven K and one Sn atom. In the second Bi site, Bi is bonded in a 7-coordinate geometry to five K and two equivalent Sn atoms. In the third Bi site, Bi is bonded in a 8-coordinate geometry to seven K and one Sn atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ni20(SnB2)3 by Materials Project

Ni20(B2Sn)3 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a distorted bent 150 degrees geometry to two equivalent B and one Sn atom. Both Ni–B bond lengths are 2.14 Å. The Ni–Sn bond length is 2.58 Å. In the second Ni site, Ni is bonded in a 4-coordinate geometry to three equivalent B and one Sn atom. All Ni–B bond lengths are 2.09 Å. The Ni–Sn bond length is 2.51 Å. B is bonded in a 8-coordinate geometry to eight Ni atoms. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a distorted tetrahedral geometry to four equivalent Ni atoms. In the second Sn site, Sn is bonded in a cuboctahedral geometry to twelve equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmAgSn by Materials Project

TmAgSn crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Tm is bonded in a 11-coordinate geometry to six equivalent Ag and five Sn atoms. There are two shorter (3.26 Å) and four longer (3.55 Å) Tm–Ag bond lengths. There are four shorter (3.13 Å) and one longer (3.17 Å) Tm–Sn bond lengths. Ag is bonded to six equivalent Tm, two equivalent Ag, and four Sn atoms to form a mixture of distorted edge, face, and corner-sharing AgTm6Ag2Sn4 cuboctahedra. Both Ag–Ag bond lengths are 3.15 Å. There are two shorter (2.83 Å) and two longer (2.88 Å) Ag–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to six equivalent Tm and three equivalent Ag atoms. In the second Sn site, Sn is bonded in a 9-coordinate geometry to three equivalent Tm and six equivalent Ag atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn5(BRh3)2 by Materials Project

Sn5(Rh3B)2 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Rh is bonded in a 7-coordinate geometry to two B and five Sn atoms. There are one shorter (2.18 Å) and one longer (2.20 Å) Rh–B bond lengths. There are a spread of Rh–Sn bond distances ranging from 2.71–2.90 Å. There are two inequivalent B sites. In the first B site, B is bonded in a distorted pentagonal pyramidal geometry to six equivalent Rh atoms. In the second B site, B is bonded in a 6-coordinate geometry to six equivalent Rh and three equivalent Sn atoms. All B–Sn bond lengths are 2.70 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 7-coordinate geometry to six equivalent Rh and one B atom. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn4BRh6 by Materials Project

Rh6BSn4 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Rh is bonded in a 1-coordinate geometry to one B and five Sn atoms. The Rh–B bond length is 2.10 Å. There are a spread of Rh–Sn bond distances ranging from 2.72–2.87 Å. B is bonded in an octahedral geometry to six equivalent Rh atoms. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Rh atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Rh atoms. In the third Sn site, Sn is bonded in a distorted q6 geometry to nine equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th5Sn4 by Materials Project

Th5Sn4 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Th sites. In the first Th site, Th is bonded to seven Sn atoms to form a mixture of distorted corner, edge, and face-sharing ThSn7 pentagonal bipyramids. There are a spread of Th–Sn bond distances ranging from 3.17–3.44 Å. In the second Th site, Th is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Th–Sn bond lengths are 3.45 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to nine Th atoms. In the second Sn site, Sn is bonded to six equivalent Th atoms to form distorted face-sharing SnTh6 octahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LuAgSn by Materials Project

LuAgSn crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. Lu is bonded in a 11-coordinate geometry to six equivalent Ag and five Sn atoms. There are two shorter (3.24 Å) and four longer (3.54 Å) Lu–Ag bond lengths. There are four shorter (3.11 Å) and one longer (3.17 Å) Lu–Sn bond lengths. Ag is bonded to six equivalent Lu, two equivalent Ag, and four Sn atoms to form a mixture of distorted corner, edge, and face-sharing AgLu6Ag2Sn4 cuboctahedra. Both Ag–Ag bond lengths are 3.13 Å. There are two shorter (2.81 Å) and two longer (2.87 Å) Ag–Sn bond lengths. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded in a 9-coordinate geometry to six equivalent Lu and three equivalent Ag atoms. In the second Sn site, Sn is bonded in a 9-coordinate geometry to three equivalent Lu and six equivalent Ag atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf5Sn4 by Materials Project

Hf5Sn4 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 6-coordinate geometry to six equivalent Sn atoms. All Hf–Sn bond lengths are 3.10 Å. In the second Hf site, Hf is bonded to seven Sn atoms to form a mixture of distorted face, edge, and corner-sharing HfSn7 pentagonal bipyramids. There are a spread of Hf–Sn bond distances ranging from 2.88–3.09 Å. There are two inequivalent Sn sites. In the first Sn site, Sn is bonded to six equivalent Hf atoms to form distorted face-sharing SnHf6 octahedra. In the second Sn site, Sn is bonded in a 9-coordinate geometry to nine Hf atoms.

36 MATERIALS SCIENCE↗