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At least 595 records · Page 33
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Cross-section measurements and production of 72 Se with medium to high energy protons using arsenic containing targets

Here, experiments were performed to evaluate production of 72 Se, parent radionuclide of the positron emitter 72 As, at high energy at the Brookhaven Linac Isotope Producer (BLIP). Excitation functions for 75 As(p, xn) 72/75 Se in the 52-105 MeV energy range were measured by irradiating thin gallium arsenide (GaAs) wafers. Maximum cross section value for the nat As(p, 4n) 72 Se reaction in the energy range was 103 ± 9 mb at 52 ± 1 MeV. Production size GaAs and arsenic metal (As°) targets were irradiated with 136 μA and 165 μA beam current possessing an initial Linac energy of 117 MeV. A total of 3.77 ± 0.1 GBq (102 ± 3 mCi) of 72 Se was produced from a GaAs target at a calculated target entrance energy of 105.4 MeV, and 13.8 ± 0.3 GBq (373 ± 8 mCi) of 72 Se from an As° target at a calculated incident energy of 49.5 MeV irradiated for 116.5 h and 68.9 h, respectively.

43 PARTICLE ACCELERATORS↗
DOE OSTI2020

Materials Data on Na3As by Materials Project

Na3As is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 4-coordinate geometry to four equivalent As3- atoms. There are one shorter (2.99 Å) and three longer (3.32 Å) Na–As bond lengths. In the second Na1+ site, Na1+ is bonded in a trigonal planar geometry to three equivalent As3- atoms. All Na–As bond lengths are 2.94 Å. As3- is bonded in a 5-coordinate geometry to eleven Na1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3Sb by Materials Project

K3Sb is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 1-coordinate geometry to four equivalent Sb3- atoms. There are one shorter (3.60 Å) and three longer (3.99 Å) K–Sb bond lengths. In the second K1+ site, K1+ is bonded in a trigonal planar geometry to three equivalent Sb3- atoms. All K–Sb bond lengths are 3.54 Å. Sb3- is bonded in a 5-coordinate geometry to eleven K1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3As by Materials Project

K3As is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a distorted single-bond geometry to four equivalent As3- atoms. There are one shorter (3.42 Å) and three longer (3.82 Å) K–As bond lengths. In the second K1+ site, K1+ is bonded in a trigonal planar geometry to three equivalent As3- atoms. All K–As bond lengths are 3.38 Å. As3- is bonded to eleven K1+ atoms to form a mixture of distorted edge and face-sharing AsK11 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NpF3 by Materials Project

NpF3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Np3+ is bonded in a 5-coordinate geometry to eleven F1- atoms. There are five shorter (2.40 Å) and six longer (2.70 Å) Np–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent Np3+ atoms. In the second F1- site, F1- is bonded in a trigonal planar geometry to three equivalent Np3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3P by Materials Project

Na3P is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a trigonal planar geometry to three equivalent P3- atoms. All Na–P bond lengths are 2.87 Å. In the second Na1+ site, Na1+ is bonded in a 1-coordinate geometry to four equivalent P3- atoms. There are one shorter (2.92 Å) and three longer (3.24 Å) Na–P bond lengths. P3- is bonded in a 5-coordinate geometry to eleven Na1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb3Sb by Materials Project

Rb3Sb is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a trigonal planar geometry to three equivalent Sb3- atoms. All Rb–Sb bond lengths are 3.71 Å. In the second Rb1+ site, Rb1+ is bonded in a 1-coordinate geometry to four equivalent Sb3- atoms. There are one shorter (3.77 Å) and three longer (4.18 Å) Rb–Sb bond lengths. Sb3- is bonded to eleven Rb1+ atoms to form a mixture of distorted edge and face-sharing SbRb11 trigonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LiCu2P by Materials Project

LiCu2P is Sodium arsenide-derived structured and crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Li1+ is bonded in a 4-coordinate geometry to four equivalent P3- atoms. There are one shorter (2.57 Å) and three longer (2.61 Å) Li–P bond lengths. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded in a distorted single-bond geometry to four equivalent P3- atoms. There are one shorter (2.35 Å) and three longer (2.70 Å) Cu–P bond lengths. In the second Cu1+ site, Cu1+ is bonded in a trigonal planar geometry to three equivalent P3- atoms. All Cu–P bond lengths are 2.33 Å. P3- is bonded in a 8-coordinate geometry to four equivalent Li1+ and seven Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Al3Ir by Materials Project

IrAl3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ir is bonded in a 5-coordinate geometry to eleven Al atoms. There are a spread of Ir–Al bond distances ranging from 2.48–2.82 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded in a trigonal planar geometry to three equivalent Ir and six equivalent Al atoms. All Al–Al bond lengths are 2.82 Å. In the second Al site, Al is bonded in a 1-coordinate geometry to four equivalent Ir and seven Al atoms. There are one shorter (2.66 Å) and three longer (2.77 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li3N by Materials Project

Li3N is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a trigonal planar geometry to three equivalent N3- atoms. All Li–N bond lengths are 2.06 Å. In the second Li1+ site, Li1+ is bonded in a 1-coordinate geometry to four equivalent N3- atoms. There are one shorter (2.07 Å) and three longer (2.33 Å) Li–N bond lengths. N3- is bonded in a 5-coordinate geometry to eleven Li1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PuH3 by Materials Project

PuH3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pu3+ is bonded in a 11-coordinate geometry to eleven H1- atoms. There are a spread of Pu–H bond distances ranging from 2.15–2.39 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to four equivalent Pu3+ atoms to form a mixture of corner, edge, and face-sharing HPu4 tetrahedra. In the second H1- site, H1- is bonded in a trigonal planar geometry to three equivalent Pu3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdH3 by Materials Project

GdH3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Gd3+ is bonded in a 11-coordinate geometry to eleven H1- atoms. There are a spread of Gd–H bond distances ranging from 2.15–2.39 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to four equivalent Gd3+ atoms to form a mixture of corner, edge, and face-sharing HGd4 tetrahedra. In the second H1- site, H1- is bonded in a trigonal planar geometry to three equivalent Gd3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3Bi by Materials Project

Na3Bi is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded in a 1-coordinate geometry to four equivalent Bi atoms. There are one shorter (3.25 Å) and three longer (3.56 Å) Na–Bi bond lengths. In the second Na site, Na is bonded in a trigonal planar geometry to three equivalent Bi atoms. All Na–Bi bond lengths are 3.17 Å. Bi is bonded in a 5-coordinate geometry to eleven Na atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Si3Ir by Materials Project

IrSi3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ir4+ is bonded in a 5-coordinate geometry to eleven Si+1.33- atoms. There are a spread of Ir–Si bond distances ranging from 2.49–2.80 Å. There are two inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 1-coordinate geometry to four equivalent Ir4+ atoms. In the second Si+1.33- site, Si+1.33- is bonded in a trigonal planar geometry to three equivalent Ir4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Ir by Materials Project

Mg3Ir is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a trigonal planar geometry to three equivalent Ir atoms. All Mg–Ir bond lengths are 2.64 Å. In the second Mg site, Mg is bonded in a 1-coordinate geometry to four equivalent Ir atoms. There are one shorter (2.72 Å) and three longer (3.00 Å) Mg–Ir bond lengths. Ir is bonded in a 5-coordinate geometry to eleven Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeF3 by Materials Project

CeF3 is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. Ce3+ is bonded in a 5-coordinate geometry to eleven F1- atoms. There are a spread of Ce–F bond distances ranging from 2.40–2.71 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a trigonal planar geometry to three equivalent Ce3+ atoms. In the second F1- site, F1- is bonded in a trigonal planar geometry to three equivalent Ce3+ atoms. In the third F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent Ce3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Rb3Bi by Materials Project

Rb3Bi is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Rb sites. In the first Rb site, Rb is bonded in a 1-coordinate geometry to four equivalent Bi atoms. There are one shorter (3.84 Å) and three longer (4.25 Å) Rb–Bi bond lengths. In the second Rb site, Rb is bonded in a trigonal planar geometry to three equivalent Bi atoms. All Rb–Bi bond lengths are 3.78 Å. Bi is bonded in a 5-coordinate geometry to eleven Rb atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3Pt by Materials Project

Mg3Pt is Sodium arsenide structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 1-coordinate geometry to four equivalent Pt atoms. There are one shorter (2.73 Å) and three longer (3.04 Å) Mg–Pt bond lengths. In the second Mg site, Mg is bonded in a trigonal planar geometry to three equivalent Pt atoms. All Mg–Pt bond lengths are 2.67 Å. Pt is bonded in a 5-coordinate geometry to eleven Mg atoms.

36 MATERIALS SCIENCE↗