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At least 37 records · Page 2
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Lu(Al2Cu)4 by Materials Project

Lu(CuAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 12-coordinate geometry to eight equivalent Cu and twelve Al atoms. All Lu–Cu bond lengths are 3.37 Å. There are four shorter (3.06 Å) and eight longer (3.19 Å) Lu–Al bond lengths. Cu is bonded in a 12-coordinate geometry to two equivalent Lu, two equivalent Cu, and eight Al atoms. Both Cu–Cu bond lengths are 2.55 Å. There are four shorter (2.57 Å) and four longer (2.69 Å) Cu–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Lu, four equivalent Cu, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.84 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Lu, four equivalent Cu, and four equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Measurements and computational analysis of the natural decay of 176 Lu

Background: Mainly because of its long half-life and despite its scientific relevance, spectroscopic measurements of 176 Lu forbidden β decays are very limited and lack formulation of shape factors. A direct precise measurement of its Q value is also presently unreported. In addition, the description of forbidden decays provides interesting challenges for nuclear theory. The comparison of precise experimental results with theoretical calculations for these decays can help to test underlying models and can aid the interpretation of data from other experiments. Purpose: Perform the first precision measurements of 176 Lu β-decay spectra and attempt the observation of its electron capture decays, as well as perform the first precision direct measurement of the 176 Lu β-decay Q value. Compare the shape of the precisely determined experimental β spectra to theoretical calculations, and compare the end point energy to that obtained from an independent Q value measurement. Method: Here, the 176 Lu β-decay spectra measurements and the search for electron capture decays were performed with an experimental setup that employed lutetium-containing scintillator crystals and a NaI(Tl) spectrometer for coincidence counting. The β decay Q value was determined via high-precision Penning trap mass spectrometry (PTMS) with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The β-spectrum calculations were performed within the Fermi theory formalism with nuclear structure effects calculated using a shell model approach. Results: Both β transitions of 176 Lu were experimentally observed and corresponding shape factors formulated in their entire energy ranges. The search for electron capture decay branches led to an experimental upper limit of 6.3×10 –6 relative to its β decays. The 176 Lu β-decay and electron capture Q values were measured using PTMS to be 1193.0(6) and 108.9(8) keV, respectively. This enabled precise β end point energies of 596.2(6) and 195.3(6) keV to be determined for the primary and secondary β decays, respectively. The conserved vector current hypothesis was applied to calculate the relativistic vector matrix elements. The β-spectrum shape was shown to significantly depend on the Coulomb displacement energy and on the value of the axial vector coupling constant gA, which was extracted according to different assumptions. Conclusion: The implemented self-scintillation method has provided unmatched observations of 176 Lu, independently validated by the first direct measurements of its β-decay Q value by Penning trap mass spectrometry. Theoretical study of the main β transition led to the extraction of very different effective gA and log10f values, showing that a high-precision description of this transition would require a realistic nuclear structure with nucleus deformation.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
DOE OSTI2020

Materials Data on Lu(BC)2 by Materials Project

Lu(BC)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent B and eight equivalent C atoms. All Lu–B bond lengths are 2.69 Å. All Lu–C bond lengths are 2.63 Å. B is bonded in a distorted trigonal planar geometry to four equivalent Lu and three equivalent C atoms. There is one shorter (1.52 Å) and two longer (1.59 Å) B–C bond length. C is bonded in a 3-coordinate geometry to four equivalent Lu and three equivalent B atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(Al2Fe)4 by Materials Project

LuFe4Al8 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 12-coordinate geometry to eight equivalent Fe and twelve Al atoms. All Lu–Fe bond lengths are 3.31 Å. There are four shorter (2.94 Å) and eight longer (3.14 Å) Lu–Al bond lengths. Fe is bonded in a 12-coordinate geometry to two equivalent Lu, two equivalent Fe, and eight Al atoms. Both Fe–Fe bond lengths are 2.51 Å. There are four shorter (2.51 Å) and four longer (2.62 Å) Fe–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Lu, four equivalent Fe, and five Al atoms. There are a spread of Al–Al bond distances ranging from 2.71–2.80 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Lu, four equivalent Fe, and six Al atoms. Both Al–Al bond lengths are 2.68 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(FeB)2 by Materials Project

Lu(FeB)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Fe and eight equivalent B atoms. All Lu–Fe bond lengths are 2.89 Å. All Lu–B bond lengths are 2.66 Å. Fe is bonded to four equivalent Lu and four equivalent B atoms to form a mixture of distorted face, edge, and corner-sharing FeLu4B4 tetrahedra. All Fe–B bond lengths are 2.16 Å. B is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Fe, and one B atom. The B–B bond length is 2.05 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(NiGe)2 by Materials Project

Lu(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Lu–Ni bond lengths are 3.16 Å. All Lu–Ge bond lengths are 3.10 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Lu and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.34 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(CoGe)2 by Materials Project

Lu(CoGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Co and eight equivalent Ge atoms. All Lu–Co bond lengths are 3.19 Å. All Lu–Ge bond lengths are 3.05 Å. Co is bonded to four equivalent Lu and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing CoLu4Ge4 tetrahedra. All Co–Ge bond lengths are 2.32 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Co, and one Ge atom. The Ge–Ge bond length is 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(BRh)4 by Materials Project

Lu(RhB)4 crystallizes in the tetragonal I4_1/acd space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to twelve equivalent Rh and twelve equivalent B atoms. There are a spread of Lu–Rh bond distances ranging from 2.90–3.25 Å. There are a spread of Lu–B bond distances ranging from 2.95–3.25 Å. Rh is bonded in a 5-coordinate geometry to three equivalent Lu and five equivalent B atoms. There are a spread of Rh–B bond distances ranging from 2.18–2.26 Å. B is bonded in a 6-coordinate geometry to three equivalent Lu, five equivalent Rh, and one B atom. The B–B bond length is 1.75 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(Mg4Al3)4 by Materials Project

Lu(Mg4Al3)4 crystallizes in the cubic I-43m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 10-coordinate geometry to three equivalent Mg, one Lu, and six equivalent Al atoms. All Mg–Mg bond lengths are 3.03 Å. The Mg–Lu bond length is 3.24 Å. All Mg–Al bond lengths are 3.14 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five equivalent Al atoms. There are two shorter (3.11 Å) and four longer (3.16 Å) Mg–Mg bond lengths. There are a spread of Mg–Al bond distances ranging from 2.87–3.17 Å. Lu is bonded in a 12-coordinate geometry to four equivalent Mg and twelve equivalent Al atoms. All Lu–Al bond lengths are 3.21 Å. Al is bonded in a 11-coordinate geometry to seven Mg, one Lu, and three equivalent Al atoms. There are one shorter (2.69 Å) and two longer (2.77 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(BC)2 by Materials Project

Lu(BC)2 crystallizes in the tetragonal P4_2/mmc space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent B and eight equivalent C atoms. All Lu–B bond lengths are 2.69 Å. All Lu–C bond lengths are 2.66 Å. B is bonded in a 2-coordinate geometry to four equivalent Lu and two equivalent C atoms. Both B–C bond lengths are 1.60 Å. C is bonded in a 2-coordinate geometry to four equivalent Lu, two equivalent B, and one C atom. The C–C bond length is 1.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(FeSn)6 by Materials Project

LuFe6Sn6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Lu is bonded to twelve equivalent Fe and eight Sn atoms to form distorted LuFe12Sn8 hexagonal bipyramids that share faces with twenty-four equivalent FeLu2Fe4Sn6 cuboctahedra and faces with six equivalent LuFe12Sn8 hexagonal bipyramids. All Lu–Fe bond lengths are 3.48 Å. There are two shorter (3.01 Å) and six longer (3.12 Å) Lu–Sn bond lengths. Fe is bonded to two equivalent Lu, four equivalent Fe, and six Sn atoms to form distorted FeLu2Fe4Sn6 cuboctahedra that share corners with fourteen equivalent FeLu2Fe4Sn6 cuboctahedra, edges with seven equivalent FeLu2Fe4Sn6 cuboctahedra, faces with nine equivalent FeLu2Fe4Sn6 cuboctahedra, and faces with four equivalent LuFe12Sn8 hexagonal bipyramids. All Fe–Fe bond lengths are 2.71 Å. There are a spread of Fe–Sn bond distances ranging from 2.69–2.83 Å. There are three inequivalent Sn sites. In the first Sn site, Sn is bonded in a 12-coordinate geometry to three equivalent Lu and six equivalent Fe atoms. In the second Sn site, Sn is bonded in a 6-coordinate geometry to six equivalent Fe atoms. In the third Sn site, Sn is bonded in a 8-coordinate geometry to one Lu, six equivalent Fe, and one Sn atom. The Sn–Sn bond length is 2.92 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(BRh)4 by Materials Project

Lu(RhB)4 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Lu is bonded in a 12-coordinate geometry to twelve equivalent Rh and twelve equivalent B atoms. There are four shorter (2.94 Å) and eight longer (3.17 Å) Lu–Rh bond lengths. There are eight shorter (3.02 Å) and four longer (3.14 Å) Lu–B bond lengths. Rh is bonded in a 5-coordinate geometry to three equivalent Lu and five equivalent B atoms. There are four shorter (2.21 Å) and one longer (2.24 Å) Rh–B bond lengths. B is bonded in a 6-coordinate geometry to three equivalent Lu, five equivalent Rh, and one B atom. The B–B bond length is 1.80 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(P2Rh3)2 by Materials Project

Lu(Rh3P2)2 crystallizes in the trigonal P3 space group. The structure is three-dimensional. Lu is bonded to six equivalent Rh and six equivalent P atoms to form face-sharing LuP6Rh6 cuboctahedra. There are three shorter (3.00 Å) and three longer (3.01 Å) Lu–Rh bond lengths. All Lu–P bond lengths are 2.95 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 5-coordinate geometry to five P atoms. There are a spread of Rh–P bond distances ranging from 2.42–2.52 Å. In the second Rh site, Rh is bonded in a 6-coordinate geometry to two equivalent Lu and four P atoms. There are a spread of Rh–P bond distances ranging from 2.32–2.51 Å. There are two inequivalent P sites. In the first P site, P is bonded in a 9-coordinate geometry to nine Rh atoms. In the second P site, P is bonded in a 8-coordinate geometry to two equivalent Lu and six Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(SiRh)2 by Materials Project

LuRh2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Rh and eight equivalent Si atoms. All Lu–Rh bond lengths are 3.19 Å. All Lu–Si bond lengths are 3.10 Å. Rh is bonded to four equivalent Lu and four equivalent Si atoms to form a mixture of distorted edge, face, and corner-sharing RhLu4Si4 tetrahedra. All Rh–Si bond lengths are 2.39 Å. Si is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Rh, and one Si atom. The Si–Si bond length is 2.38 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(SiPd)2 by Materials Project

LuPd2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Pd and eight equivalent Si atoms. All Lu–Pd bond lengths are 3.23 Å. All Lu–Si bond lengths are 3.13 Å. Pd is bonded to four equivalent Lu and four equivalent Si atoms to form a mixture of distorted face, edge, and corner-sharing PdLu4Si4 tetrahedra. All Pd–Si bond lengths are 2.46 Å. Si is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Pd, and one Si atom. The Si–Si bond length is 2.29 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(HO)3 by Materials Project

Lu(OH)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Lu3+ sites. In the first Lu3+ site, Lu3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Lu–O bond distances ranging from 2.06–2.51 Å. In the second Lu3+ site, Lu3+ is bonded to six O2- atoms to form distorted corner-sharing LuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–47°. There are a spread of Lu–O bond distances ranging from 2.06–2.36 Å. In the third Lu3+ site, Lu3+ is bonded to six O2- atoms to form corner-sharing LuO6 octahedra. The corner-sharing octahedra tilt angles range from 45–47°. There are a spread of Lu–O bond distances ranging from 2.17–2.34 Å. In the fourth Lu3+ site, Lu3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Lu–O bond distances ranging from 2.05–2.53 Å. There are twelve 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 1.01 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to 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 one O2- atom. The H–O bond length is 1.00 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.01 Å. In the fifth H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.04 Å) and one longer (1.66 Å) H–O bond length. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the seventh H1+ site, H1+ is bonded in a distorted single-bond geometry to one O2- atom. The H–O bond length is 1.02 Å. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.02 Å. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the tenth H1+ site, H1+ is bonded in a distorted linear geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.56 Å) H–O bond length. In the eleventh 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 twelfth H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.20 Å) and one longer (1.23 Å) H–O bond length. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 150 degrees geometry to two Lu3+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to two Lu3+ and two H1+ atoms. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Lu3+ and one H1+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the ninth O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and one H1+ atom. In the tenth O2- site, O2- is bonded in a distorted single-bond geometry to two Lu3+ and two H1+ atoms. In the eleventh O2- site, O2- is bonded in a distorted water-like geometry to two Lu3+ and two H1+ atoms. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to two Lu3+ and two H1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(BO2)3 by Materials Project

Lu(BO2)3 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Lu3+ sites. In the first Lu3+ site, Lu3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Lu–O bond distances ranging from 2.27–2.65 Å. In the second Lu3+ site, Lu3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Lu–O bond distances ranging from 2.22–2.58 Å. In the third Lu3+ site, Lu3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Lu–O bond distances ranging from 2.22–2.80 Å. In the fourth Lu3+ site, Lu3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Lu–O bond distances ranging from 2.23–2.50 Å. There are six inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.46–1.53 Å. In the second B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.54 Å. In the third B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There is two shorter (1.47 Å) and two longer (1.48 Å) B–O bond length. In the fourth B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.52 Å. In the fifth B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There is two shorter (1.45 Å) and two longer (1.53 Å) B–O bond length. In the sixth B3+ site, B3+ is bonded to four O2- atoms to form corner-sharing BO4 tetrahedra. There are a spread of B–O bond distances ranging from 1.45–1.53 Å. There are fifteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to three Lu3+ and one B3+ atom. In the second O2- site, O2- is bonded in a trigonal planar geometry to three B3+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Lu3+ and two B3+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Lu3+ and two B3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Lu3+ and two B3+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Lu3+ and two B3+ atoms. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Lu3+ and two B3+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Lu3+ and two equivalent B3+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Lu3+ and two B3+ atoms. In the tenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Lu3+ and two equivalent B3+ atoms. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to one Lu3+ and two equivalent B3+ atoms. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to one Lu3+ and two equivalent B3+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Lu3+ and two equivalent B3+ atoms. In the fourteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Lu3+ and two B3+ atoms. In the fifteenth O2- site, O2- is bonded in a 2-coordinate geometry to two Lu3+ and two equivalent B3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(SiPt)2 by Materials Project

LuPt2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Pt and eight equivalent Si atoms. All Lu–Pt bond lengths are 3.21 Å. All Lu–Si bond lengths are 3.17 Å. Pt is bonded in a 4-coordinate geometry to four equivalent Lu and four equivalent Si atoms. All Pt–Si bond lengths are 2.46 Å. Si is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Pt, and one Si atom. The Si–Si bond length is 2.29 Å.

36 MATERIALS SCIENCE↗