NpSe₂: a Binary Chalcogenide Containing Modulated Selenide Chains and Ambiguous‐Valent Metal

Abstract

A new binary compound, NpSe2, possesses metal–chalcogen and chalcogen–chalcogen interactions different from those reported for other metal dichalcogenides. Its structure is incommensurately modulated and features linear Se chains and valence‐ambiguous Np cations.

Implementation of cryogenic tender X-ray HR-XANES spectroscopy at the ACT station of the CAT-ACT beamline at the KIT Light Source

“…Here, a seven-analyzercrystal Johann-type X-ray emission spectrometer with 1 m bending radius was used, e.g. to study the Pu L 3 -edge of intermetallic plutonium phases (Booth et al, 2012(Booth et al, , 2014, PuO 2 (Tobin & Shuh, 2015) and the Np L 3 -edge for NpSe 2 solid phases (Jin et al, 2019). Popa et al (2015) analyzed the structure of Pu(III) phosphate, applying the Johann-type X-ray emission spectrometer at the MARS beamline at SOLEIL for Pu and Am L 3 HR-XANES measurements, and herewith confirming the +3 valence state of Pu as well as that of its Am daughter resulting from À decay.…”

Reactions of Neptunium(V) in Alkali-Metal Hydroxides

“…The synthesis of actinide-containing molecules and materials has expanded considerably over the last several years. Synthetic studies employing less traditional solvents as reaction media including molten salts, reactive fluxes, , alkaline solutions, and hydrofluxes, , have considerably expanded our catalogue of actinide structure types, serving to highlight the richness and complexity of chemistry within the 5f elements. The synthesis of actinide and, in particular, transuranium molecules, compounds, and materials aides studies of the complex electronic structure of the early actinide elements, particularly as it relates to their bonding and magnetic properties. ,− Furthermore, the exploratory synthesis of actinide compounds informs our knowledge of their speciation and structure as it relates to environmental chemistry and remediation, waste management, and efforts aimed at developing sustainable and economical nuclear fuel cycles for energy production.…”