In this paper, possibilities and limits of the application of REE3+ luminescence (especially the Nd3+4F3/2 → 4I9/2 emission) as structural probe are evaluated. Important factors controlling the Nd3+ luminescence signal are discussed, including effects of the crystal-field, crystal orientation, structural state, and temperature. Particular attention was paid to the study of the accessory mineral...

Colloidal, organic solvent-soluble Ln3+-doped LaVO4 nanoparticles have been synthesized by a precipitation reaction in the presence of (C18H37O)2PS2- as ligand, that coordinates to the surface of the nanoparticles. The materials are well soluble in chlorinated solvent such as chloroform. Energy transfer of excited vanadate groups has been observed for Ln3+ ions that emit in the visible and the ...

A novel flow injection method has been developed for the indirect determination of uranium by the on-line reduction and subsequent fluorimetric detection of cerium(III). A sample solution containing uranium(VI), prepared as a sulfuric acid solution, was injected into a sulfuric acid carrier solution and passed through a column packed with metal bismuth to reduce uranium(VI) to uranium(IV). The ...

The Role of Irradiation: Irradiation is widely invoked as a mechanism by which simple carbonbearing molecules may be polymerised or otherwise reacted to form progressively more complex molecules that could ultimately synthesize life [1]. In our solar system, cosmic irradiation has been invoked as a source of complex molecules on the Galilean satellites, and on Titan, Pluto, Uranus and Neptune. ...

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The exploitation of massive rare-earth element (REE) deposits is frequently contested because the pollution generated by heavy mining operations and REE extractive metallurgy operations. In an effort to minimise environmental footprint production meet increasing demand for these elements, mine wastes tailings are attracting attention as alternative primary sources. However, residues contain sma...

The physico-chemical changes occurring during the high-temperature phase transformation of monazite in presence Na2CO3 at 1000 °C for 2 h duration monazite: ratios between 1.0 and 5.0, were investigated. formation sodium lanthanide phosphates was prevalent above a monazite:alkali ratio 2, however, below this ratio, dephosphorization as Na3PO4 Ce1-xLnxO2-x/2 solid solutions occur offering unique...