Nano-sized yttria particles were synthesized via a non-aqueous sol-gel process based on hydrated yttrium nitrate and ethylene glycol. The effects of the molar ratio of ethylene glycol to yttrium ion and calcination temperature on crystallite size of the products were studied. The catalytic perfo...

We report, synthesis of nano crystalline YFeO3 powders by solution combustion process using alanine (C3H7NO2) as a fuel at stoichiometric ratio. The yttrium-nitrate hexahydrate (Y(NO3)3.6H2O) and ferric nitrate nonahydrate (Fe(NO3)3.9H2O) were used as oxidizers. The prepared powders were charact...

We applied a nitrate freeze-drying method to obtain a fine synthesized powder of 15% yttrium-doped barium zirconate. Fine 15% yttrium-doped barium zirconate powder of particle size about 30 nm was obtained by synthesizing at 500 °C in vacuum from a powder mixed by the nitrate freeze-drying meth...

Tetragonal-structured colloidal spheres of Y/Eu binary and Y/Tb/Eu ternary phosphate hydrates have been successfully synthesized via microwave-assisted homogeneous precipitation, and the effects of hydrate water on crystal structure and luminescent behavior were investigated by detailed characte...

Yttrium silicate coatings are applied on C-SiC composites for advanced aerospace structural applications at high temperatures. The Air Plasma Spray (APS) method is widely used for the deposition of yttrium silicate coatings. However, the oxidation resistance offered by the APS-deposited coating ...

Heats of solution of yttrium and lanthanoid metal nitrate hydrates (Ln(NO3)3·nH2O: Ln  La-Lu; n = 1–6) in water were measured at 298.15 K. A linear relationship was found between the heats of solution ΔHS and water contents n per mole of nitrate for all the nitrates. When the heats of solut...

The visible and NIR absorption spectrum of uranium(V) chloride in room temperature acidic melts has been measured. This spectrum was obtained by the direct dissolution of an uranium(V) chloride compound into a room temperature melt. Changing the acidic melt to a basic melt by adding EMIC caused ...

The Southern High Plains (SHP) is a new and emerging U.S. uranium province. Here, uranyl vanadates form deposits in Pliocene to Pleistocene sandstone, dolomite, and limestone. Fifteen calcrete uranium occurrences are identified; two of these, the Buzzard Draw and Sulfur Springs Draw deposits, ha...

A pyrochemical conversion of U3O8 into metallic uranium by chemical and electrochemical reactions have been studied. Triuranium octaoxide was chlorinated by carbon tetrachloride gas in a stream of argon at different temperatures. The optimal conditions of the solid phase transformation were foun...

We have investigated the suitability of phosphate addition, in the form MH2PO4 (M = Na+, K+ or NH4+), for the selective removal of uranium from a complex waste effluent. The effluent in question is generated as part of a treatment strategy for a spent uranium catalyst, used in the production of ...

The complexes MBr4· xL (x = 2, L ≡ (i-Pr2N)(Me2N)CO, (i-Pr2N)-(Ph2N)CO, (i-Bu2N)(Me2N)CO, M ≡ Th and U; x = 2, L ≡ (Et2N)(Me2N)CO (dedmu), (MePhN)2CO (dmdpu), (Me2N)2CO and (Et2N)2CO, M ≡ Th; x = 3, L ≡ dmdpu and dedmu, M ≡ Th) have been prepared. The IR and near IR-visible spectra (urani...

The complexes UBr4 · xL (x = 2, L ≡ CH3CON(cyclo-C6H11)2, CH3-CON(C6H5)2 (dpha), C2H5CON(CH3)2 (dmpa), C2H5CON(C2H5)2 (depa), C2H5CON(i-C3H7)2, (CH3)2CHCON(i-C′3H7)2 and (CH3)3CCON(i-C3H7)2; x = 2.33, L ≡ dmpa; x = 2.5, L ≡ dpha; x = 3, L ≡ depa) have been prepared. The IR and near IR-visi...

The complexes MBr4·xL (x = 6, M ≡ Th and U, L ≡ PMe2PhO (dmppo); x = 3, M ≡ Th and U, L ≡ PMePh2O (mdppo) and M ≡ Th, L ≡ P(i-C3H73O (tippo); x = 2, M ≡ Th and U, L ≡ tippo and M ≡ U, L ≡ dmppo and mdppo) and the ethyl acetate solvate UBr4·6dmppo·2MeCOOEt have been prepared. The IR ...

Vapour pressures of solid and liquid uranium tetrabromide have been measured in the temperature range of 696 to 805 K and 805 to 1003 K respectively by transpiration and evaporation-temperature techniques. The vapour pressures obtained by the two techniques are in good agreement and have been co...

The electrochemistry of UBr3 was studied on W working electrodes in LiBr-KBr-CsBr eutectic salt at 623 K. The U(III)/U (0) redox reaction was evaluated with respect to its electrochemical behavior, diffusion and electrocrystallization properties. According to cyclic voltammetry and square wave v...

VOx monolayer on TiO2 catalysts have been prepared by grafting and subsequently promoted with tungsten, tin, and potassium by impregnation. The samples have been characterized through N2 physisorption at 77 K, PXRD, Raman spectroscopy, H2-TPR, and 1H Solid State NMR spectroscopy with NH3 as prob...

Molten salt electrolysis was utilized for the separation of cobalt and tungsten from cemented carbide scrap in the NaCl–KCl melt at 1023 K (750 °C). The WC-15 Co sacrificial anode was dissolved to cobalt and tungsten ions and consequently discharged on the cathode to deposit cobalt and tungste...

In this study, WC–10Co cemented carbide scrap was used as a consumable anode to separate and prepare tungsten and cobalt powders in NaF–KF melts at 1073 K. The feasibility of direct electrochemical dissolution of WC main phase to produce metallic tungsten was analyzed by thermodynamic calculat...

Tungsten coatings were prepared by electrodeposition on vanadium alloy (V-4Cr-4Ti) substrate from Na2WO4-WO3 molten salt at 1173 K in atmosphere. The crystal structure, microstructure, microhardness, oxygen content of the coating as well as bond strength between coatings and substrates were inve...

In this study, WC and WC-6 wt% Co scraps were utilized in molten salt state as two consumable anodes to circulate tungsten and cobalt during electrolysis. Because of poor dissolution of cemented carbide scrap in NaCl-KCl salt, tungsten trioxide was added to NaCl-KCl salt as active substance to i...