Crystal growth of K2UO4 and Na4UO5 using hydroxide fluxes

A New Look at the Structural and Magnetic Properties of Potassium Neptunate K2NpO4 Combining XRD, XANES Spectroscopy, and Low-Temperature Heat Capacity

“…17 The refined cell parameters obtained in the present study, a = 4.3322(3) Å and c = 13.1881(13) Å, are in good agreement with the literature. 17 The refined atomic positions are given in the Supporting Information. A Rietveld refinement for the K 2 NpO 4 phase is reported for the first time in this work (Figure 1).…”

Multiple cation and anion substitutions into the structures of Bi2WO6 and PbBi3WO8Cl

“…The tetragonal subcell parameters of the compounds studied here (a°6 4 Å) lie well below those of others whose structures contain the same [UO 4 ] 2À layers, e.g. K 2 UO 4 (a°= 4.33 Å [21]). The UO 6 octahedra in the bismuth compounds are significantly compressed.…”

Single crystal growth and structural characterization of ternary transition-metal uranium oxides: MnUO4, FeUO4, and NiU2O6

“…The single crystal growth of complex uranium-containing oxides has garnered recent attention, due to a strong desire to understand better existing structure-property relationships. Complex uranium-containing oxides have been grown as single crystals using a variety of methods, including chemical vapor transport [1][2][3][4][5], hydrothermal synthesis [6][7][8][9][10][11][12], traditional solid-state processing [8,, and flux crystal growth [15,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Much of the reported crystal growth utilized the solid-state approach, however, there are some limitations with this method.…”

“…The second most published crystal growth method for complex uranium-containing oxides is flux growth. We have explored the use of hydroxide [43,44] and carbonate fluxes [42,45,46] for the crystal growth of complex oxides, and have found that the oxidizing nature of these melts limits these fluxes to compounds containing metals in high oxidation states, such as hexavalent uranium. We have recently begun using halide fluxes to explore the crystal growth of uranium containing oxides and related materials in a redox neutral environment, [51] targeting the crystal growth of complex oxides containing uranium in reduced oxidation states.…”