SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Hg is alpha Samarium structured and crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of six mercury molecules. Hg is bonded in a 5-coordinate geometry to atoms.
Hg crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of two mercury molecules. Hg is bonded in a 2-coordinate geometry to atoms.
Hg is Copper structured and crystallizes in the trigonal R-3m space group. The structure is zero-dimensional and consists of three mercury molecules. Hg is bonded in a 12-coordinate geometry to atoms.
Hg is alpha La structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is zero-dimensional and consists of four mercury molecules. Hg is bonded in a 6-coordinate geometry to atoms.
Hg is Magnesium structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is zero-dimensional and consists of two mercury molecules. Hg is bonded in a 12-coordinate geometry to atoms.
A wide range of liquid metals have been considered for application in nuclear fission and fusion reactors. Liquid mercury (Hg) was tested as a coolant and working fluid for nuclear fission reactors and as a neutron source target. Liquid lithium and lead lithium eutectic (Li and PbLi) have been extensively studied for fusion reactor designs including plasma facing components (PFCs). Liquid tin and gallium (Sn and Ga) have recently gained attention as alternative PFCs due to their low vapor pressure and chemical stability. To enable successful application of these less common liquid metals, corrosion compatibility with containment materials needs to be investigated. For this purpose, this article reviews corrosion behavior and structural material compatibility, including ferrous alloys, refractory metals, and ceramics, by liquid Li, PbLi, Sn, Ga, and Hg.
The decay of the 13/2 + isomeric state in 183 Hg was observed for the first time following the a decay of the 13/2 + isomer in 187 Pb produced in the 142 Nd( 50 Cr, 2p3n) reaction. Using $\alpha - \gamma$ delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) μs. This isomer is proposed to deexcite by an unobserved low-energy M2 transition to the known 9/2 - member of a strongly prolate-deformed 7/2 - [514] band, followed by a 105-keV M1 transition to the bandhead. A lower limit of B(M2) >= 0.018 W.u. was deduced for the unobserved transition. The presumed retardation is proposed to be due to the notable shape change between the initial, nearly spherical, and the final, strongly deformed, states. A similar scenario is also considered for the 13/2 + isomer in 181 Hg, suggesting both are cases of shape isomers. The B(M2) systematics of neutron transitions across the nuclear chart is discussed.
HgBr6(N2)2 crystallizes in the tetragonal P4/mnc space group. The structure is zero-dimensional and consists of four nitrogen molecules and two HgBr6 clusters. In each HgBr6 cluster, Hg2+ is bonded in an octahedral geometry to six Br1- atoms. There are two shorter (2.47 Å) and four longer (3.30 Å) Hg–Br bond lengths. There are four inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom. In the second Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom. In the third Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom. In the fourth Br1- site, Br1- is bonded in a single-bond geometry to one Hg2+ atom.
HgCl2N2 crystallizes in the orthorhombic Cmmm space group. The structure is one-dimensional and consists of four ammonia molecules and two HgCl2 ribbons oriented in the (0, 0, 1) direction. In each HgCl2 ribbon, Hg2+ is bonded in a distorted square co-planar geometry to four equivalent Cl1- atoms. All Hg–Cl bond lengths are 2.61 Å. Cl1- is bonded in an L-shaped geometry to two equivalent Hg2+ atoms.
Hg(MoS2)6 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one mercury molecule and four MoS2 clusters. In two of the MoS2 clusters, Mo+3.67+ is bonded in a 1-coordinate geometry to two S2- atoms. Both Mo–S bond lengths are 2.32 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted single-bond geometry to one Mo+3.67+ and one S2- atom. The S–S bond length is 2.08 Å. In the second S2- site, S2- is bonded in a 1-coordinate geometry to one Mo+3.67+ and one S2- atom. In two of the MoS2 clusters, there are two inequivalent Mo+3.67+ sites. In the first Mo+3.67+ site, Mo+3.67+ is bonded in a 1-coordinate geometry to two S2- atoms. Both Mo–S bond lengths are 2.32 Å. In the second Mo+3.67+ site, Mo+3.67+ is bonded in a 1-coordinate geometry to two S2- atoms. There are one shorter (2.31 Å) and one longer (2.32 Å) Mo–S bond lengths. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 2-coordinate geometry to one Mo+3.67+ and one S2- atom. The S–S bond length is 2.08 Å. In the second S2- site, S2- is bonded in a 1-coordinate geometry to one Mo+3.67+ and one S2- atom. The S–S bond length is 2.08 Å. In the third S2- site, S2- is bonded in a distorted single-bond geometry to one Mo+3.67+ and two S2- atoms. The S–S bond length is 4.07 Å. In the fourth S2- site, S2- is bonded in a distorted single-bond geometry to one Mo+3.67+ and two S2- atoms.
II-VI semiconductor nanoplatelets have emerged as promising candidates for various applications, owing to their tunable optical properties dictated by their thickness and compositions. In the realm of infrared technology, mercury chalcogenides stand out as particularly promising materials for optoelectronic applications. However, the direct synthesis of 2D particles in this category remains challenging, thus prompting the exploration of alternative methods such as cation exchange. Here, we demonstrate that the cation exchange process from cadmium to mercury can be effectively catalyzed by monovalent Ag + cations. Further, this catalysis facilitates the formation of alloyed Hg x Cd 1-x Se nanoplatelets with tunable optical properties, with the photoluminescence peak ranging from 1.23 eV for the thinnest three-monolayer (ML) nanoplatelets to 0.92 eV for the thickest 7 ML nanoplatelets. The Ag + ions reduce the activation energy of the cation exchange process by a factor of 2, enabling enhanced penetration of mercury atoms deep into the native CdSe nanoplatelets. Moreover, these nanoplatelets exhibit optical gain in the infrared spectrum, including the 1.3 μm telecommunication band, with a fluence threshold at 80 K of 50 μJ∙cm -2 .
We perform magnetic susceptibility and magnetic torque measurements on the organic κ-(BEDT-TTF) 2 Hg(SCN) 2 Br, which is recently suggested to host an exotic quantum dipole-liquid in its low-temperature insulating phase. Below the metal-insulator (MI) transition temperature, the magnetic susceptibility follows a Curie–Weiss law with a positive Curie–Weiss temperature, and a particular M∝ $\sqrt{H}$ curve is observed. The emergent ferromagnetically interacting spins amount to about 1/6 of the full spin moment of localized charges. Taking account of the possible inhomogeneous quasi-charge-order that forms a dipole-liquid, we construct a model of antiferromagnetically interacting spin chains in two adjacent charge-ordered domains, which are coupled via fluctuating charges on a Mott-dimer at the boundary. We find that the charge fluctuations can draw a weak ferromagnetic moment out of the spin singlet domains.
Not Available
Accepted version of FGD LIBS Applied Physics B manuscript
We report the extraction of 73 As, 75 Se, 197 mHg, 212 Pb and 210 Po on Eichrom pre-filter resin was studied in HCl and HNO 3 with batch uptake, kinetic and column experiments. There was significant extraction of mercury in HNO 3 and HCl, and polonium and selenium in HCl. The kinetics are sufficient to allow for retention on pre-filter columns, and separations of 73 As from 75 Se and 197 mHg, and 212 Pb from 210 Po are demonstrated. This retention is important for the development of chemical separations as pre-filter resin is commonly used alongside extraction chromatography resins but its potential for uptake of metal ions is not well characterized.
Explore the source record for details and available documents.
Abstract not provided
Not Available