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9 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Production and discovery of neutron-rich isotopes by fragmentation of 198 Pt

Production cross sections were measured for fragments produced by an 85 MeV/u 198 Pt beam incident on a beryllium target. Event-by-event particle identification of A, Z, and q for the reaction products was performed by employing energy loss, time-of-flight, magnetic rigidity, and total kinetic energy measurements. Over 70 nuclei in the Hf-Pt region were identified, including three isotopes first observed in this work: 191,192 Hf and 189 Lu. Due to the existence of multiple charge states between H-like and C-like ions, a new analysis method was introduced, incorporating Monte Carlo calculations of charge state fractions for a given charge state of the projectile residue just after the reaction. For the first time, charge-state probability distribution functions after the reaction have been deduced from experimental data. Furthermore, this study provides insight into how to produce key nuclides near N = 126 and the ability of a fragmentation residue to retain electrons from the primary beam.

190 ≤ A ≤ 219↗
DOE OSTI2020

Materials Data on HfPt by Materials Project

PtHf is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to eight equivalent Pt atoms. All Hf–Pt bond lengths are 2.88 Å. Pt is bonded in a body-centered cubic geometry to eight equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfPt3 by Materials Project

HfPt3 is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded to twelve Pt atoms to form a mixture of face and corner-sharing HfPt12 cuboctahedra. There are six shorter (2.86 Å) and six longer (2.87 Å) Hf–Pt bond lengths. In the second Hf site, Hf is bonded to twelve Pt atoms to form a mixture of face and corner-sharing HfPt12 cuboctahedra. All Hf–Pt bond lengths are 2.86 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded in a distorted see-saw-like geometry to four Hf atoms. In the second Pt site, Pt is bonded in a distorted square co-planar geometry to four Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Pt by Materials Project

Hf3Pt is Uranium Silicide-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Hf is bonded in a distorted see-saw-like geometry to four equivalent Pt atoms. There are two shorter (2.99 Å) and two longer (3.07 Å) Hf–Pt bond lengths. Pt is bonded to twelve equivalent Hf atoms to form a mixture of face and corner-sharing PtHf12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfPt by Materials Project

PtHf crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Hf is bonded in a 7-coordinate geometry to seven equivalent Pt atoms. There are a spread of Hf–Pt bond distances ranging from 2.74–2.97 Å. Pt is bonded in a 7-coordinate geometry to seven equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfPt3 by Materials Project

HfPt3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded to twelve equivalent Pt atoms to form a mixture of face and corner-sharing HfPt12 cuboctahedra. All Hf–Pt bond lengths are 2.85 Å. Pt is bonded in a distorted square co-planar geometry to four equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2Pt3 by Materials Project

Hf2Pt3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Hf is bonded in a 9-coordinate geometry to nine Pt atoms. There are a spread of Hf–Pt bond distances ranging from 2.76–2.96 Å. There are two inequivalent Pt sites. In the first Pt site, Pt is bonded in a distorted body-centered cubic geometry to eight equivalent Hf atoms. In the second Pt site, Pt is bonded in a 10-coordinate geometry to five equivalent Hf atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf3Pt by Materials Project

Hf3Pt is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hf is bonded in a distorted square co-planar geometry to four equivalent Pt atoms. All Hf–Pt bond lengths are 3.04 Å. Pt is bonded to twelve equivalent Hf atoms to form a mixture of corner and face-sharing PtHf12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfPt4 by Materials Project

HfPt4 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. there are two inequivalent Hf4+ sites. In the first Hf4+ site, Hf4+ is bonded to twelve Pt1- atoms to form HfPt12 cuboctahedra that share corners with four equivalent PtPt12 cuboctahedra, corners with eight HfPt12 cuboctahedra, edges with four equivalent PtPt12 cuboctahedra, a faceface with one PtPt12 cuboctahedra, and faces with five HfPt12 cuboctahedra. There are a spread of Hf–Pt bond distances ranging from 2.78–2.90 Å. In the second Hf4+ site, Hf4+ is bonded to twelve Pt1- atoms to form a mixture of corner and face-sharing HfPt12 cuboctahedra. There are a spread of Hf–Pt bond distances ranging from 2.83–2.85 Å. There are seven inequivalent Pt1- sites. In the first Pt1- site, Pt1- is bonded to twelve Pt1- atoms to form PtPt12 cuboctahedra that share corners with four equivalent PtPt12 cuboctahedra, edges with eight equivalent HfPt12 cuboctahedra, and faces with eight PtPt12 cuboctahedra. There are four shorter (2.84 Å) and eight longer (2.87 Å) Pt–Pt bond lengths. In the second Pt1- site, Pt1- is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf4+ atoms. In the third Pt1- site, Pt1- is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf4+ atoms. In the fourth Pt1- site, Pt1- is bonded in a distorted L-shaped geometry to two equivalent Hf4+ and four Pt1- atoms. Both Pt–Pt bond lengths are 2.87 Å. In the fifth Pt1- site, Pt1- is bonded in a distorted rectangular see-saw-like geometry to four Hf4+ atoms. In the sixth Pt1- site, Pt1- is bonded in a distorted square co-planar geometry to four equivalent Hf4+ atoms. In the seventh Pt1- site, Pt1- is bonded to twelve Pt1- atoms to form PtPt12 cuboctahedra that share corners with four equivalent PtPt12 cuboctahedra, corners with eight equivalent HfPt12 cuboctahedra, faces with two equivalent HfPt12 cuboctahedra, and faces with eight PtPt12 cuboctahedra.

36 MATERIALS SCIENCE↗