Lanthanide (Ln) fluorides are considered exceptional luminescent rigid host matrices for various optical active Ln3+ ions due to their high refractive index, high chemical stability and low phonon energy, leading to the low probability of non‐radiative decay, which results in higher photolumine...
The organolanthanide fluoride [(η 5 -C 5 H t 4 Bu) 2 Sm(μ-F)] 3 (1) was generated by oxidation of [(η 5 -C 5 H t 4 Bu) 2 Sm(THF) 2 ] with Me 3 SnF. The X-ray structural analysis of 1 showed the tr...
The electrochemical behaviour of SmF 3 is examined in molten LiF–CaF 2 medium on molybdenum and nickel electrodes. A previous thermodynamic analysis suggests that the reduction of SmF 3 into Sm proceeds according to a two-step mechanism:Sm III +e − =Sm ...
The electrochemical behavior of samarium ions in LiF-CaF2 melts at tungsten electrodes is investigated by cyclic voltammetry and square wave voltammetry. The electrochemical reduction of Sm(III) into Sm(II) according to Eq. (1) is reversible within 900mV/s.Sm3++e−→Sm2+(1)The reduction process f...
Tangential phase-matching has been utilised to increase the conversion efficiency of the difference frequency mixing process for the generation of tunable infrared radiation in the lithium iodate crystal for the first time. Using the Nd: YAG second harmonic and the same pumped dye laser radiati...
Permanent optical waveguides have been produced by proton implantation in LilO 3 single crystals by using a Van De Graaff accelerator. The effects of the crystal cut and of the implantation parameters on the optical waveguides properties, investigated by dark line mode spectroscopy, are ...
Due to its non-linear optical properties, lithium iodate is commonly used in optical devices. By proton exchange, performed by immersing z-cuts LiIO 3 single crystals in a molten hydrated nitrate salt, we formed a solid solution Li 1 - x H x IO 3 layer clo...
The 1 2 7 I NQR, IR absorption and Raman spectra of impurity-doped and mixed lithium iodate Li 1 - x H x IO 3 crystals grown from water solutions with different LiIO 3 /HIO 3 ratios were investigated depending on the content of the ...
The crystal structure of α- and β-LiIO 3 at room temperature was examined using X-rays diffraction. Differential thermal analysis (DTA) with different heating rates (5-50K/min) in the range 300-600K was performed. The activation energy of phase transition was calculated by two methods ...
A possibility of growth of profiled single crystals of α-LiIO3 with a hollow channel using a shaper from polymer nanoparticles is showed. A method of creating the nanoparticles of polystyrene is described.
General aspects of optical (photorefractive) damage to LiNbO3, LiTaO3, and LiIO3 single crystals are analyzed. These compounds possess no semiconducting properties, and, as a consequence, the photorefractive effect in them defies classical description. A model for the optical-damage zone is prop...
The mechanism of solvent extraction of uranium(VI) from highly concentrated chloride solution with a quaternary ammonium salt, benzyloctadecyldimethylammonium chloride (BODMAC, R4NCl), dissolved in chloroform was studied. The compositions of the extracted species were R4N.UO2Cl3 and (R4N)2 .UO2C...
Taguchi’s method was used to determine the optimum conditions for the separation of uranium and thorium using neutral extractants. The experimental conditions were studied in the concentration ranges of 0.01–5M for three different acids (nitric acid, hydrochloric acid, and sulfuric acid) using...
Cultures of U(VI) reducing bacteria sourced from abandoned uranium mine tailing dam were evaluated for their ability to reduce U(VI) to U(IV). The species in the cultures reduced U(VI) in solutions with initial U(VI) concentration up to 400mgL − 1 under a near neutral pH of 6.5. The ...
The oxidation-reduction reaction between U(VI) and Ti(III) in HCl solution was studied spectrophotometrically. The reaction is second-order at all concentrations of reactants, HCl, ferrous chloride and mannitol used in this work. In 5M HCl the rate constant k increases with increasing Ti(III) ...
Using X-ray absorption spectroscopy, we have identified the mechanism by which chloride impacts the extraction of U(VI) by a weak base anion exchange resin from acidic sulfate solutions. The amount of chloride present affects U(VI) speciation both in the feed solutions and adsorbed by the resin,...
The electrochemical behavior of uranyl nitrate in 1-butyl-3-methylimidazolium chloride at glassy carbon working electrode has been investigated in the temperature range 343–373K by transient electrochemical techniques such as cyclic voltammetry, chronopotentiometry and square wave voltammetry. ...
The effect of uranium added in ecologically relevant concentrations (1×10 −5 and 1×10 −6 M) to stable multispecies biofilms was studied by electrochemical oxygen microsensors with tip diameters of 10μm and by confocal laser fluorescence microscopy (CLSM). The microsensor profi...
We describe the synthesis and structure of Barium sulfate nanoparticles by precipitation method in the presence of water soluble inorganic stabilizing agent, sodium hexametaphosphate, (NaPO 3 ) 6 . The structural parameters were refined by the Rietveld refinement method using pow...
Crystallization of sodium barium metaphosphate glasses has been studied by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and thermal analysis. The glasses studied have compositions given by the general formula (50-x)Na 2 O-xBaO-50P 2 O 5 ...
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