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At least 325 records · Page 18
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on V(CrS2)2 by Materials Project

V(CrS2)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. V2+ is bonded to six S2- atoms to form VS6 octahedra that share corners with six equivalent CrS6 octahedra, edges with two equivalent VS6 octahedra, edges with four equivalent CrS6 octahedra, and a faceface with one CrS6 octahedra. The corner-sharing octahedra tilt angles range from 52–54°. There are a spread of V–S bond distances ranging from 2.34–2.56 Å. There are two inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded to six S2- atoms to form CrS6 octahedra that share corners with six equivalent CrS6 octahedra, edges with two equivalent CrS6 octahedra, edges with four equivalent VS6 octahedra, and a faceface with one CrS6 octahedra. The corner-sharing octahedra tilt angles range from 50–56°. There are a spread of Cr–S bond distances ranging from 2.30–2.52 Å. In the second Cr3+ site, Cr3+ is bonded to six S2- atoms to form CrS6 octahedra that share corners with six equivalent VS6 octahedra, corners with six equivalent CrS6 octahedra, edges with two equivalent CrS6 octahedra, a faceface with one VS6 octahedra, and a faceface with one CrS6 octahedra. The corner-sharing octahedra tilt angles range from 50–56°. There are a spread of Cr–S bond distances ranging from 2.39–2.47 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to one V2+ and four Cr3+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to two equivalent V2+ and three Cr3+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to one V2+ and three Cr3+ atoms. In the fourth S2- site, S2- is bonded in a 4-coordinate geometry to two equivalent V2+ and two Cr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(Mo3Se4)2 by Materials Project

V(Mo3Se4)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. V4+ is bonded in a body-centered cubic geometry to eight Se2- atoms. There are a spread of V–Se bond distances ranging from 2.56–3.12 Å. There are three inequivalent Mo2+ sites. In the first Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.72 Å. In the second Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.69 Å. In the third Mo2+ site, Mo2+ is bonded to five Se2- atoms to form a mixture of edge and corner-sharing MoSe5 square pyramids. There are a spread of Mo–Se bond distances ranging from 2.54–2.69 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms. In the second Se2- site, Se2- is bonded in a 1-coordinate geometry to one V4+ and three Mo2+ atoms. In the third Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms. In the fourth Se2- site, Se2- is bonded in a 5-coordinate geometry to one V4+ and four Mo2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(FeSe2)2 by Materials Project

V(FeSe2)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. V2+ is bonded to six Se2- atoms to form distorted VSe6 octahedra that share corners with six equivalent FeSe6 octahedra, edges with two equivalent VSe6 octahedra, edges with four equivalent FeSe6 octahedra, and a faceface with one FeSe6 octahedra. The corner-sharing octahedra tilt angles range from 52–57°. There are a spread of V–Se bond distances ranging from 2.39–2.75 Å. There are two inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded to six Se2- atoms to form FeSe6 octahedra that share corners with six equivalent VSe6 octahedra, corners with six equivalent FeSe6 octahedra, edges with two equivalent FeSe6 octahedra, a faceface with one VSe6 octahedra, and a faceface with one FeSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–57°. There are a spread of Fe–Se bond distances ranging from 2.43–2.53 Å. In the second Fe3+ site, Fe3+ is bonded to six Se2- atoms to form distorted FeSe6 octahedra that share corners with six equivalent FeSe6 octahedra, edges with two equivalent FeSe6 octahedra, edges with four equivalent VSe6 octahedra, and a faceface with one FeSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are a spread of Fe–Se bond distances ranging from 2.38–2.70 Å. There are four inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 5-coordinate geometry to one V2+ and four Fe3+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to two equivalent V2+ and three Fe3+ atoms. In the third Se2- site, Se2- is bonded in a 4-coordinate geometry to two equivalent V2+ and two Fe3+ atoms. In the fourth Se2- site, Se2- is bonded in a 4-coordinate geometry to one V2+ and three Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(BiO3)2 by Materials Project

V(BiO3)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. V4+ is bonded to four O2- atoms to form VO4 tetrahedra that share corners with four equivalent BiO6 pentagonal pyramids. There are a spread of V–O bond distances ranging from 1.73–1.76 Å. There are two inequivalent Bi4+ sites. In the first Bi4+ site, Bi4+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Bi–O bond distances ranging from 2.15–2.86 Å. In the second Bi4+ site, Bi4+ is bonded to six O2- atoms to form distorted BiO6 pentagonal pyramids that share corners with four equivalent VO4 tetrahedra. There are a spread of Bi–O bond distances ranging from 2.17–2.66 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to one V4+ and two Bi4+ atoms. In the second O2- site, O2- is bonded in a trigonal planar geometry to three Bi4+ atoms. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to two Bi4+ atoms. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one V4+ and one Bi4+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one V4+ and one Bi4+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to one V4+ and two Bi4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(MoS2)2 by Materials Project

VMo2S4 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are two inequivalent V4+ sites. In the first V4+ site, V4+ is bonded to six S2- atoms to form VS6 octahedra that share corners with twelve MoS6 octahedra, edges with two equivalent VS6 octahedra, and faces with two MoS6 octahedra. The corner-sharing octahedra tilt angles range from 48–57°. There are a spread of V–S bond distances ranging from 2.41–2.46 Å. In the second V4+ site, V4+ is bonded to six S2- atoms to form VS6 octahedra that share corners with twelve MoS6 octahedra, edges with two equivalent VS6 octahedra, and faces with two MoS6 octahedra. The corner-sharing octahedra tilt angles range from 49–57°. There are a spread of V–S bond distances ranging from 2.40–2.47 Å. There are four inequivalent Mo2+ sites. In the first Mo2+ site, Mo2+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with six VS6 octahedra, edges with six MoS6 octahedra, and a faceface with one VS6 octahedra. The corner-sharing octahedra tilt angles range from 48–57°. There are a spread of Mo–S bond distances ranging from 2.38–2.60 Å. In the second Mo2+ site, Mo2+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with six VS6 octahedra, edges with six MoS6 octahedra, and a faceface with one VS6 octahedra. The corner-sharing octahedra tilt angles range from 49–57°. There are a spread of Mo–S bond distances ranging from 2.38–2.61 Å. In the third Mo2+ site, Mo2+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with six VS6 octahedra, edges with six MoS6 octahedra, and a faceface with one VS6 octahedra. The corner-sharing octahedra tilt angles range from 50–57°. There are a spread of Mo–S bond distances ranging from 2.37–2.62 Å. In the fourth Mo2+ site, Mo2+ is bonded to six S2- atoms to form distorted MoS6 octahedra that share corners with six VS6 octahedra, edges with six MoS6 octahedra, and a faceface with one VS6 octahedra. The corner-sharing octahedra tilt angles range from 51–57°. There are a spread of Mo–S bond distances ranging from 2.37–2.62 Å. There are eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to two V4+ and three Mo2+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to two V4+ and three Mo2+ atoms. In the third S2- site, S2- is bonded in a 4-coordinate geometry to one V4+ and three Mo2+ atoms. In the fourth S2- site, S2- is bonded in a 4-coordinate geometry to one V4+ and three Mo2+ atoms. In the fifth S2- site, S2- is bonded in a 4-coordinate geometry to one V4+ and three Mo2+ atoms. In the sixth S2- site, S2- is bonded in a 4-coordinate geometry to one V4+ and three Mo2+ atoms. In the seventh S2- site, S2- is bonded in a 5-coordinate geometry to two V4+ and three Mo2+ atoms. In the eighth S2- site, S2- is bonded in a 5-coordinate geometry to two V4+ and three Mo2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(CrTe2)2 by Materials Project

V(CrTe2)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. V2+ is bonded to six Te2- atoms to form VTe6 octahedra that share corners with six equivalent CrTe6 octahedra, edges with two equivalent VTe6 octahedra, edges with four equivalent CrTe6 octahedra, and a faceface with one CrTe6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are a spread of V–Te bond distances ranging from 2.71–2.85 Å. There are two inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded to six Te2- atoms to form CrTe6 octahedra that share corners with six equivalent CrTe6 octahedra, edges with two equivalent CrTe6 octahedra, edges with four equivalent VTe6 octahedra, and a faceface with one CrTe6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are a spread of Cr–Te bond distances ranging from 2.72–2.86 Å. In the second Cr3+ site, Cr3+ is bonded to six Te2- atoms to form CrTe6 octahedra that share corners with six equivalent VTe6 octahedra, corners with six equivalent CrTe6 octahedra, edges with two equivalent CrTe6 octahedra, a faceface with one VTe6 octahedra, and a faceface with one CrTe6 octahedra. The corner-sharing octahedra tilt angles range from 49–53°. There are a spread of Cr–Te bond distances ranging from 2.77–2.81 Å. There are four inequivalent Te2- sites. In the first Te2- site, Te2- is bonded in a distorted rectangular see-saw-like geometry to one V2+ and three Cr3+ atoms. In the second Te2- site, Te2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent V2+ and two Cr3+ atoms. In the third Te2- site, Te2- is bonded in a 5-coordinate geometry to one V2+ and four Cr3+ atoms. In the fourth Te2- site, Te2- is bonded in a 5-coordinate geometry to two equivalent V2+ and three Cr3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(CrSi3)2 by Materials Project

V(CrSi3)2 is Titanium Disilicide-derived structured and crystallizes in the orthorhombic C222 space group. The structure is three-dimensional. V2+ is bonded in a distorted q6 geometry to ten Si+1.33- atoms. There are a spread of V–Si bond distances ranging from 2.49–2.59 Å. Cr3+ is bonded in a distorted q6 geometry to ten Si+1.33- atoms. There are a spread of Cr–Si bond distances ranging from 2.46–2.60 Å. There are two inequivalent Si+1.33- sites. In the first Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to three equivalent V2+, two equivalent Cr3+, and five Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.47–2.60 Å. In the second Si+1.33- site, Si+1.33- is bonded in a 10-coordinate geometry to one V2+, four equivalent Cr3+, and five Si+1.33- atoms. There are a spread of Si–Si bond distances ranging from 2.46–2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(Cr7S10)2 by Materials Project

V(Cr7S10)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. V2+ is bonded to six S2- atoms to form VS6 octahedra that share corners with twelve CrS6 octahedra, edges with two equivalent VS6 octahedra, and faces with two equivalent CrS6 octahedra. The corner-sharing octahedra tilt angles range from 49–51°. There are two shorter (2.43 Å) and four longer (2.47 Å) V–S bond lengths. There are seven inequivalent Cr+2.71+ sites. In the first Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form CrS6 octahedra that share corners with two equivalent VS6 octahedra, corners with four equivalent CrS6 octahedra, edges with six CrS6 octahedra, and a faceface with one CrS6 octahedra. The corner-sharing octahedra tilt angles range from 47–53°. There are a spread of Cr–S bond distances ranging from 2.37–2.51 Å. In the second Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form a mixture of edge, corner, and face-sharing CrS6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Cr–S bond distances ranging from 2.37–2.51 Å. In the third Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form a mixture of edge, corner, and face-sharing CrS6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Cr–S bond distances ranging from 2.36–2.51 Å. In the fourth Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form a mixture of edge, corner, and face-sharing CrS6 octahedra. The corner-sharing octahedra tilt angles range from 46–52°. There are a spread of Cr–S bond distances ranging from 2.36–2.51 Å. In the fifth Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form CrS6 octahedra that share corners with two equivalent CrS6 octahedra, corners with four equivalent VS6 octahedra, edges with six CrS6 octahedra, and a faceface with one VS6 octahedra. The corner-sharing octahedra tilt angles range from 49–51°. There are a spread of Cr–S bond distances ranging from 2.37–2.48 Å. In the sixth Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form a mixture of edge, corner, and face-sharing CrS6 octahedra. The corner-sharing octahedra tilt angles range from 46–53°. There are a spread of Cr–S bond distances ranging from 2.45–2.47 Å. In the seventh Cr+2.71+ site, Cr+2.71+ is bonded to six S2- atoms to form a mixture of edge, corner, and face-sharing CrS6 octahedra. The corner-sharing octahedra tilt angles range from 47–52°. There are a spread of Cr–S bond distances ranging from 2.43–2.46 Å. There are ten inequivalent S2- sites. In the first S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Cr+2.71+ atoms. In the second S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Cr+2.71+ atoms. In the third S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Cr+2.71+ atoms. In the fourth S2- site, S2- is bonded to five Cr+2.71+ atoms to form a mixture of distorted edge and corner-sharing SCr5 trigonal bipyramids. In the fifth S2- site, S2- is bonded to five Cr+2.71+ atoms to form a mixture of distorted edge and corner-sharing SCr5 trigonal bipyramids. In the sixth S2- site, S2- is bonded to five Cr+2.71+ atoms to form a mixture of distorted edge and corner-sharing SCr5 trigonal bipyramids. In the seventh S2- site, S2- is bonded to five Cr+2.71+ atoms to form a mixture of distorted edge and corner-sharing SCr5 trigonal bipyramids. In the eighth S2- site, S2- is bonded to two equivalent V2+ and three equivalent Cr+2.71+ atoms to form a mixture of distorted edge and corner-sharing SV2Cr3 trigonal bipyramids. In the ninth S2- site, S2- is bonded in a rectangular see-saw-like geometry to one V2+ and three Cr+2.71+ atoms. In the tenth S2- site, S2- is bonded in a rectangular see-saw-like geometry to four Cr+2.71+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(FeSe2)2 by Materials Project

V(FeSe2)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. V2+ is bonded to six Se2- atoms to form VSe6 octahedra that share corners with twelve equivalent FeSe6 octahedra, edges with two equivalent VSe6 octahedra, and faces with two equivalent FeSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are two shorter (2.53 Å) and four longer (2.54 Å) V–Se bond lengths. Fe3+ is bonded to six Se2- atoms to form distorted FeSe6 octahedra that share corners with six equivalent VSe6 octahedra, edges with six equivalent FeSe6 octahedra, and a faceface with one VSe6 octahedra. The corner-sharing octahedra tilt angles range from 51–56°. There are a spread of Fe–Se bond distances ranging from 2.41–2.79 Å. There are two inequivalent Se2- sites. In the first Se2- site, Se2- is bonded in a 4-coordinate geometry to one V2+ and three equivalent Fe3+ atoms. In the second Se2- site, Se2- is bonded in a 5-coordinate geometry to two equivalent V2+ and three equivalent Fe3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2023

III-V PV Cell Core Capability (Final Technical Report)

This Core project developed III-V photovoltaics for terrestrial applications, focusing on high efficiency architectures and on cost-reduction. III-V cells have demonstrated the highest efficiencies of any photovoltaic materials system, reaching over 30% for two- junction tandems and over 47% for more complex concentrator cells. III-Vs have other characteristics that make them attractive to a range of terrestrial and near-terrestrial energy applications, such as being direct absorbers, lightweight and potentially flexible, having good thermal coefficient, good radiation hardness, and being very stable and durable. Cost is a key challenge with III-Vs, however, because of the high cost of epitaxy and processing.

14 SOLAR ENERGY↗
DOE OSTI2025

Decoherence of V B spin defects in monoisotopic hexagonal boron nitride

Spin defects in hexagonal boron nitride (hBN) are promising quantum systems for the design of flexible two-dimensional quantum sensing platforms. Here we rely on hBN crystals isotopically enriched with either 10B or 11B to investigate the isotope-dependent properties of a spin defect featuring a broadband photoluminescence signal in the near infrared. By analyzing the hyperfine structure of the spin defect while changing the boron isotope, we first unambiguously confirm that it corresponds to the negatively-charged boron-vacancy center (V− B ). We then show that its spin coherence properties are slightly improved in 10B-enriched samples. This is supported by numerical simulations employing cluster correlation expansion methods, which reveal the importance of the hyperfine Fermi contact term for calculating the coherence time of point defects in hBN. Using crossrelaxation spectroscopy, we finally identify dark electron spin impurities as an additional source of decoherence. This work provides new insights into the properties of V− B spin defects, which are valuable for the future development of hBN-based quantum sensing foils.

Haykal, A.↗
DOE OSTI2023

Search for the critical point of strongly-interacting matter in $^{40}$Ar + $^{45}$Sc collisions at 150A Ge V /c using scaled factorial moments of protons

The critical point of dense, strongly interacting matter is searched for at the CERN SPS in $^{40}$Ar + $^{45}$Sc collisions at 150A Ge V /c. The dependence of second-order scaled factorial moments of proton multiplicity distribution on the number of subdivisions of transverse momentum space is measured. The intermittency analysis is performed using both transverse momentum and cumulative transverse momentum. For the first time, statistically independent data sets are used for each subdivision number. The obtained results do not indicate any statistically significant intermittency pattern. An upper limit on the fraction of correlated proton pairs and the power of the correlation function is obtained based on a comparison with the Power-law Model developed for this purpose.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2024

Measurements of $\pi ^\pm $, $K^\pm $, p and $\bar{p}$ spectra in $^{40}\hbox {Ar+}^{45}\hbox {Sc}$ collisions at 13A to 150A $\text{ Ge }\hspace{-1.00006pt}\text{ V }\!/\!c$

The NA61/SHINE experiment at the CERN Super Proton Synchrotron studies the onset of deconfinement in strongly interacting matter through a beam energy scan of particle production in collisions of nuclei of varied sizes. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $\pi ^\pm $, $K^\pm $, p and $\bar{p}$ produced in $^{40}\hbox {Ar+}^{45}\hbox {Sc}$ collisions at beam momenta of 13A, 19A, 30A, 40A, 75A and 150A $\text{ Ge }\hspace{-1.00006pt}\text{ V }\!/\!c$. The analysis uses the 10% most central collisions, where the observed forward energy defines centrality. The energy dependence of the $K^\pm $/$\pi ^\pm $ ratios as well as of inverse slope parameters of the $K^\pm $ transverse mass distributions are placed in between those found in inelastic $p+p$ and central Pb + Pb collisions. The results obtained here establish a system-size dependence of hadron production properties that so far cannot be explained either within statistical or dynamical models.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
DOE OSTI2025

Towards the Stable Chelation of Radioantimony(V) for Targeted Auger Theranostics

Abstract Antimony‐119 ( 119 Sb) is one of the most attractive Auger‐electron emitters identified to date, but it remains practically unexplored for targeted radiotherapy because no chelators have been identified to stably bind this metalloid in vivo. In a departure from current studies focused on chelator development for Sb(III), we explore the chelation chemistry of Sb(V) using the tris‐catecholate ligand TREN‐CAM. Through a combination of radiolabeling, spectroscopic, solid‐state, and computational studies, the radiochemistry and structural chemistry of TREN‐CAM with 1XX/nat Sb(V) were established. The resulting [ 1XX Sb]Sb–TREN‐CAM complex remained intact for several days in human serum, signifying high stability under biological conditions. Finally, the first in vivo single photon emission computed tomography and positron emission tomography imaging studies were carried out using 117 Sb, the diagnostic analogue of 119 Sb. These studies revealed marked differences in the uptake and distribution of activity in mice administered unchelated [ 117 Sb]Sb(OH) 6 – versus [ 117 Sb]Sb–TREN‐CAM, suggesting that 117 Sb is largely retained by TREN‐CAM over the time course of the study. Collectively, these findings demonstrate the most physiologically stable complex of no‐carrier‐added 1XX Sb yet reported, offering new promise for the clinical implementation of radioantimony in nuclear medicine. Our results also establish the feasibility of 117 Sb as an elementally matched partner to 119 Sb for theranostic applications.

Olson, Aeli P. [Department of Medical Physics Univ↗
DOE OSTI2025

Towards the Stable Chelation of Radioantimony(V) for Targeted Auger Theranostics

Antimony-119 ( 119 Sb) is one of the most attractive Auger-electron emitters identified to date, but it remains practically unexplored for targeted radiotherapy because no chelators have been identified to stably bind this metalloid in vivo. In a departure from current studies focused on chelator development for Sb(III), we explore the chelation chemistry of Sb(V) using the tris-catecholate ligand TREN-CAM. Through a combination of radiolabeling, spectroscopic, solid-state, and computational studies, the radiochemistry and structural chemistry of TREN-CAM with 1XX/nat Sb(V) were established. The resulting [ 1XX Sb]Sb–TREN-CAM complex remained intact for several days in human serum, signifying high stability under biological conditions. Finally, the first in vivo single photon emission computed tomography and positron emission tomography imaging studies were carried out using 117 Sb, the diagnostic analogue of 119 Sb. These studies revealed marked differences in the uptake and distribution of activity in mice administered unchelated [ 117 Sb]Sb(OH) 6 – versus [ 117 Sb]Sb–TREN-CAM, suggesting that 117 Sb is largely retained by TREN-CAM over the time course of the study. Collectively, these findings demonstrate the most physiologically stable complex of no-carrier-added 1XX Sb yet reported, offering new promise for the clinical implementation of radioantimony in nuclear medicine. In conclusion, our results also establish the feasibility of 117 Sb as an elementally matched partner to 119 Sb for theranostic applications.

62 RADIOLOGY AND NUCLEAR MEDICINE↗
DOE OSTI2026

Microbial reduction of low-crystallinity tripuhyite (FeSbO 4 ): Implications for Sb(V) cycling in contaminated environments

Tripuhyite (FeSbO 4 ) is an important antimony (Sb)-bearing mineral that controls Sb mobility in contaminated environments, yet its structural stability during microbial reduction remains unresolved. Understanding how FeSbO 4 behaves under anoxic conditions is therefore necessary to predict natural Sb cycling. Here, this study examined how an anaerobic microbial community interacts with FeSbO 4 and alters its structural and redox behavior. Across all conditions, FeSbO 4 released measurable Sb(V), demonstrating that the mineral undergoes partial dissolution in anoxic environment even without microbial activity. However, when extensive microbial Fe(III) reduction occurred in the presence of the electron shuttle anthraquinone-2,6-disulfonate (AQDS), the released Sb was re-immobilized. This indicates that microbial reduction processes modulate Sb mobility. Microbial community analysis showed the enrichment of acetate-utilizing Fe(III)-reducing bacteria as key drivers of Fe reduction. Although secondary Fe minerals were not detected, X-ray absorption fine structure measurements and scanning electron microscopy images revealed the formation of an Sb(III)-bearing phase consistent with valentinite (Sb 2 O 3 ) in the AQDS-amended treatment. This transformation suggests that AQDS not only enhances Fe(III) reduction but is also linked to Sb(V) reduction, and facilitates the immobilization of reduced Sb(III) as Sb 2 O 3 . Overall, this work provides the first evidence that FeSbO 4 is susceptible to microbially mediated redox transformations, and that these processes can significantly alter the mobility and speciation of Sb in reducing environments.

Electron transfer mediator↗
DOE OSTI2025

Microstructure and mechanical behavior of a TiC nanoprecipitate strengthened V Alloy

The V-4Cr-4Ti (V44) alloys have been proposed as the prime candidate structural material for self-cooled liquid Li blanket and other designs for fusion energy applications. However, the applications of the V44 alloy are limited to a narrow operation temperature window, due to reduction in creep strength at or above 700 °C and susceptibility to irradiation hardening and embrittlement when irradiated below 400 °C. Here, in this work, we explore the feasibility of designing a novel V alloy to form a high number density of TiC nanoprecipitates, in order to simultaneously improve creep strength and provide defect sinks to mitigate irradiation hardening. Computational thermodynamics was used to design a new alloy (V44C) to achieve our goal of high TiC nanoprecipitates density within the alloy V44 matrix. To ensure scalability, the new alloy was made through arc-melting and ingot-casting followed by hot forging, cold rolling and heat treatments of homogenization and precipitation aging. The microstructure was characterized by SEM, TEM, XRD and APT, confirming the existence of nanoprecipitates predicted in the thermodynamic calculations. In addition to microstructural evaluation tensile properties at room temperature and 700 °C, and Charpy impact energy at room temperature were measured. The microstructure and mechanical properties were then compared with those from a historic reference V44 alloy. The tensile strength improvement in V44C was rationalized based on particle and solid solution strengthening mechanism. The fracture behavior was discussed based on the fractography results and necking deformation behavior.

Alloys development↗
DOE OSTI2025

Determination of the nat Ti(d,x) 49 V excitation function by liquid scintillation analysis

Here, the experimental cross-sections for deuteron-induced nuclear reactions on natural titanium were measured using the stacked-foil method. Deuteron beams were provided by a Pelletron tandem accelerator at incident energies up to 8 MeV. The cross-sections for the production of 49 V were determined by liquid scintillation analysis, with the highest measured value of 522(32) mb occurring at 5.59(9) MeV. Additionally, the cross-sections for the production of 44m,46,47,48 Sc and 48 V were evaluated using gamma-ray spectroscopy and compared to some available literature.

43 PARTICLE ACCELERATORS↗