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At least 127 records · Page 7
All sourcesNASA NTRSDOE OSTI
NASA NTRS1991

s-process Ba, Nd, and Sm in presolar SiC from the Murchison meteorite

Ion microprobe isotopic measurements of Ba, Nd, and Sm in the K-series SiC size separates on which noble gas measurements were made by Lewis et al. (1990) are reported. All elements show isotopic abundance patterns characteristic for the s-process. The Ba-134/Ba-136 ratios are distinct from solar, indicating that s-Ba in SiC is different from that in the solar system. Ba-138/Ba-136 ratios decrease with grain size; if interpreted as being due to different neutron exposures, this trend is opposite of that shown by the Kr-86/Kr-82 ratios. Although other isotropic ratios for Ba and those for Nd and Sm differ in detail from theoretical predictions, the disagreements probably being due to uncertainties in the n-capture cross sections and simplifications in the models, the general agreement of the data with models of s-process nucleosynthesis support an AGB star origin for the relatively fine-grain SiC under consideration. Ba-136 in SiC is up to 85 percent pure s-process.

Zinner, Ernst↗
DOE OSTI2020

Materials Data on Ba(RhPb2)3 by Materials Project

Ba(RhPb2)3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight Pb atoms. There are four shorter (3.61 Å) and four longer (3.64 Å) Ba–Pb bond lengths. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 10-coordinate geometry to three equivalent Rh and seven Pb atoms. There are two shorter (3.09 Å) and one longer (3.18 Å) Rh–Rh bond lengths. There are a spread of Rh–Pb bond distances ranging from 2.77–3.05 Å. In the second Rh site, Rh is bonded in a 7-coordinate geometry to seven Pb atoms. There are a spread of Rh–Pb bond distances ranging from 2.69–2.87 Å. There are four inequivalent Pb sites. In the first Pb site, Pb is bonded in a 5-coordinate geometry to two equivalent Ba and three equivalent Rh atoms. In the second Pb site, Pb is bonded in a 4-coordinate geometry to two equivalent Ba and three equivalent Rh atoms. In the third Pb site, Pb is bonded in a 6-coordinate geometry to six equivalent Rh atoms. In the fourth Pb site, Pb is bonded in a 3-coordinate geometry to three Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(Cu3As)2 by Materials Project

BaCu6As2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent As atoms. All Ba–Cu bond lengths are 3.61 Å. All Ba–As bond lengths are 3.43 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a distorted bent 120 degrees geometry to two equivalent Ba, four Cu, and two equivalent As atoms. All Cu–Cu bond lengths are 2.54 Å. Both Cu–As bond lengths are 2.44 Å. In the second Cu site, Cu is bonded in a 10-coordinate geometry to eight equivalent Cu and two equivalent As atoms. Both Cu–As bond lengths are 2.65 Å. In the third Cu site, Cu is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. As is bonded in a 9-coordinate geometry to four equivalent Ba and five Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(HO)2 by Materials Project

Ba(OH)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 4-coordinate geometry to five H1+ and eight O2- atoms. There are a spread of Ba–H bond distances ranging from 2.69–2.97 Å. There are a spread of Ba–O bond distances ranging from 2.65–3.06 Å. In the second Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to three H1+ and eight O2- atoms. There are a spread of Ba–H bond distances ranging from 2.85–3.01 Å. There are a spread of Ba–O bond distances ranging from 2.69–3.33 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to three Ba2+ and one O2- atom. The H–O bond length is 0.97 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(HO)2 by Materials Project

Ba(OH)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 12-coordinate geometry to four H1+ and eight O2- atoms. There are a spread of Ba–H bond distances ranging from 2.66–3.05 Å. There are a spread of Ba–O bond distances ranging from 2.74–3.05 Å. In the second Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to three H1+ and seven O2- atoms. There are a spread of Ba–H bond distances ranging from 2.84–2.98 Å. There are a spread of Ba–O bond distances ranging from 2.67–2.89 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(HO)2 by Materials Project

Ba(OH)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 2-coordinate geometry to six H1+ and eight O2- atoms. There are a spread of Ba–H bond distances ranging from 2.60–3.19 Å. There are a spread of Ba–O bond distances ranging from 2.76–2.94 Å. In the second Ba2+ site, Ba2+ is bonded in a 4-coordinate geometry to three H1+ and seven O2- atoms. There are a spread of Ba–H bond distances ranging from 2.64–2.99 Å. There are a spread of Ba–O bond distances ranging from 2.72–2.93 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to three Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 1.00 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to two equivalent Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to four Ba2+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(HO)2 by Materials Project

Ba(OH)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to four H1+ and four O2- atoms. There are a spread of Ba–H bond distances ranging from 2.71–2.84 Å. There are a spread of Ba–O bond distances ranging from 2.75–2.89 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to three H1+ and six O2- atoms. There are a spread of Ba–H bond distances ranging from 2.61–2.83 Å. There are a spread of Ba–O bond distances ranging from 2.65–2.99 Å. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to three Ba2+ and one O2- atom. The H–O bond length is 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to two Ba2+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to two Ba2+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(HO)2 by Materials Project

Ba(OH)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are three inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Ba–O bond distances ranging from 2.63–2.81 Å. In the second Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to two H1+ and seven O2- atoms. There are one shorter (2.86 Å) and one longer (3.01 Å) Ba–H bond lengths. There are a spread of Ba–O bond distances ranging from 2.61–2.88 Å. In the third Ba2+ site, Ba2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Ba–O bond distances ranging from 2.66–3.01 Å. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.98 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one Ba2+ and one O2- atom. The H–O bond length is 0.97 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to three Ba2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to two Ba2+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one H1+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to three Ba2+ and one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(MgSi)2 by Materials Project

BaMg2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight equivalent Mg and eight equivalent Si atoms. All Ba–Mg bond lengths are 3.62 Å. All Ba–Si bond lengths are 3.53 Å. Mg is bonded to four equivalent Ba and four equivalent Si atoms to form a mixture of distorted edge, face, and corner-sharing MgBa4Si4 tetrahedra. All Mg–Si bond lengths are 2.79 Å. Si is bonded in a 9-coordinate geometry to four equivalent Ba, four equivalent Mg, and one Si atom. The Si–Si bond length is 2.48 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(Sn2Ru)3 by Materials Project

Ba(RuSn2)3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight Sn atoms. There are four shorter (3.56 Å) and four longer (3.60 Å) Ba–Sn bond lengths. There are two inequivalent Ru sites. In the first Ru site, Ru is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Ru–Sn bond distances ranging from 2.57–2.76 Å. In the second Ru site, Ru is bonded in a 7-coordinate geometry to seven Sn atoms. There are a spread of Ru–Sn bond distances ranging from 2.63–2.88 Å. There are four inequivalent Sn sites. In the first Sn site, Sn is bonded in a 3-coordinate geometry to three Ru atoms. In the second Sn site, Sn is bonded in a 5-coordinate geometry to two equivalent Ba and three equivalent Ru atoms. In the third Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Ru atoms. In the fourth Sn site, Sn is bonded in a 2-coordinate geometry to two equivalent Ba and three equivalent Ru atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(ClO4)2 by Materials Project

Ba(ClO4)2 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Ba is bonded to twelve O atoms to form distorted BaO12 cuboctahedra that share corners with eight equivalent ClO4 tetrahedra, edges with four equivalent BaO12 cuboctahedra, and edges with two equivalent ClO4 tetrahedra. There are a spread of Ba–O bond distances ranging from 2.94–3.02 Å. There are two inequivalent O sites. In the first O site, O is bonded in a distorted single-bond geometry to one Ba and one Cl atom. The O–Cl bond length is 1.44 Å. In the second O site, O is bonded in a distorted single-bond geometry to two equivalent Ba and one Cl atom. The O–Cl bond length is 1.48 Å. Cl is bonded to four O atoms to form ClO4 tetrahedra that share corners with four equivalent BaO12 cuboctahedra and an edgeedge with one BaO12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(GaH)2 by Materials Project

Ba(GaH)2 crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one Ba(GaH)2 sheet oriented in the (0, 0, 1) direction. Ba is bonded in a distorted hexagonal planar geometry to six equivalent H atoms. All Ba–H bond lengths are 2.71 Å. Ga is bonded in a single-bond geometry to one H atom. The Ga–H bond length is 1.69 Å. H is bonded to three equivalent Ba and one Ga atom to form a mixture of distorted corner and edge-sharing HBa3Ga tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2025

U-Pu and Ba-Cs isotopic measurements on Trinitite by laser ablation sampling on the Neoma MC-ICP-MS

In this study we present the results of combined U-Pu and Ba-Cs isotope measurements obtained by laser ablation (LA) sampling of two glassy debris fragments (‘Trinitite’) from the world's first atomic bomb detonation conducted in New Mexico on July 16, 1945. Our primary goal in conducting these measurements was to understand whether examination of the U-Pu and Ba-Cs systematics by direct sampling (e.g. without any chemical separation or purification prior to isotope ratio measurement) could yield meaningful information that would differentiate the Trinitite fragments from glassy material lacking a nuclear fission signature. These measurements were conducted on a ThermoFisher Scientific Neoma multi collector – inductively coupled plasma – mass spectrometer (MC-ICP-MS), which is a relatively new MC-ICP-MS platform, so we also examine the behavior of these isotope systems in standards sampled in solution and via LA. Unsurprisingly, the measurements made on purified solutions of the U, Pu, and Ba isotopic standards produce high precision isotope ratios. Furthermore, this extends to the U-Pu measurements made by LA sampling, with the expected degradation in precision and accuracy related to matrix effects and signal intensity fluctuation. However, the Ba-Cs data acquired by LA is of low precision across all of the matrices examined and bears evidence of complex mass fractionation that will require further investigation to resolve. In total, our results indicate that the observed U-Pu isotope data are of sufficient quality to accurately constrain the U and Pu isotopic composition of glass containing sub-ppm levels of these elements which in turn could be used to differentiate glass containing anthropogenic fission products from natural glass whereas the Ba-Cs LA data cannot be used for this purpose until further methodological refinement is performed.

Ba-Cs↗
DOE OSTI2020

Materials Data on Ba by Materials Project

Ba is Tungsten structured and crystallizes in the cubic Im-3m space group. The structure is three-dimensional. Ba is bonded in a body-centered cubic geometry to eight equivalent Ba atoms. All Ba–Ba bond lengths are 4.36 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba by Materials Project

Ba is Magnesium structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ba is bonded to twelve equivalent Ba atoms to form a mixture of edge, face, and corner-sharing BaBa12 cuboctahedra. There are six shorter (4.48 Å) and six longer (4.49 Å) Ba–Ba bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba by Materials Project

Ba crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Ba is bonded in a 11-coordinate geometry to eleven equivalent Ba atoms. There are a spread of Ba–Ba bond distances ranging from 4.13–4.77 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba by Materials Project

Ba is Hg_xSn structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ba is bonded to eight equivalent Ba atoms to form a mixture of edge and corner-sharing BaBa8 hexagonal bipyramids. There are two shorter (3.98 Å) and six longer (4.29 Å) Ba–Ba bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba by Materials Project

Ba is alpha Po structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba is bonded to six equivalent Ba atoms to form a mixture of corner and edge-sharing BaBa6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are four shorter (3.94 Å) and two longer (3.98 Å) Ba–Ba bond lengths.

36 MATERIALS SCIENCE↗