A5103131382- Molten salt chemistry and electrochemical processes
- Extraction and Separation Processes
- Metallurgical Processes and Thermodynamics
- Bauxite Residue and Utilization
- Nuclear materials and radiation effects
- Inorganic Fluorides and Related Compounds
- Thermodynamic and Structural Properties of Metals and Alloys
- Recycling and utilization of industrial and municipal waste in materials production
- Pigment Synthesis and Properties
- Radioactive element chemistry and processing
- Thermal and Kinetic Analysis
- Lanthanide and Transition Metal Complexes
- Metal Extraction and Bioleaching
- Organophosphorus compounds synthesis
- Zeolite Catalysis and Synthesis
- Concrete Corrosion and Durability
- Smart Materials for Construction
- Ionic liquids properties and applications
- Advanced materials and composites
- Urban Stormwater Management Solutions
- Luminescence Properties of Advanced Materials
- Graphite, nuclear technology, radiation studies
- Synthesis and characterization of novel inorganic/organometallic compounds
- Chemical Synthesis and Characterization
- Inorganic Chemistry and Materials
Toronto Metropolitan University
2023
Ural Federal University
2013-2022
Institute of Physics and Technology
2015-2021
E.ON (United Kingdom)
2016
Electronic absorption spectra of ions trivalent rare earth elements were measured in the melts based on NaCl–2CsCl eutectic wavelength ranges 190–1350 and 1450–1700 nm. The measurements performed at 550–850 °C. EAS Y, La, Ce Lu containing have no bands studied regions. For remaining REEs (Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) assigned to corresponding f–f electron transitions. Stark effect was observed for Yb(III) F5/2 excited state. Increasing temperature leads decreasing intensity...
Molybdenum electrode and Mo(III)/(IV) redox potentials were measured in fused alkali chlorides. Experiments performed individual salts (LiCl, NaCl, KCl, RbCl CsCl) several binary ternary eutectic or low-melting mixtures between 633 1173 K (depending on the melting point of solvent salt). Formal standard E*Mo/Mo(III) E*Mo(III)/Mo(IV) respect to Cl−/Cl2 couple Gibbs free energy change formation molybdenum(III) chloride melts calculated. Electronic absorption spectra Mo(III) ions recorded,...
The behavior of lanthanide (samarium, europium and ytterbium) chloride species in NaCl-2CsCl eutectic based melts was studied between 823–1023 K employing cyclic voltammetry, high temperature electronic absorption spectroscopy spectroelectrochemistry. Diffusion coefficients the chloro-species, formal standard red-ox potentials thermodynamics formation LnCl 3 from corresponding dichlorides were determined. A series spectroelectrochemical experiments performed to study cathodic reduction...
Particle size distribution of phosphates 13 rare earth elements formed in NaCl–2CsCl eutectic based melts at 650 o C was determined. Sodium orthophosphate used as a precipitant. Initial phosphate-to-rare molar ratio the reaction mixture corresponded to 50 and 100 % degree precipitation. Particles powders obtained after aqueous treatment quenched tend agglomerate ultrasonic employed particle measurements. Normally particles have 0.1–100 μm. The position maxima PSD curves depends on nature RE...
The reaction between 15 rare earth chlorides (yttrium, lanthanum and all the lanthanides except for promethium) sodium orthophosphate was studied in NaCl-2CsCl eutectic based melts 550 750 oC under an inert atmosphere. Rare phosphates were precipitated from melt their composition determined chemical analysis, vibrational spectroscopy X-ray powder diffraction measurements. effects of temperature initial phosphate-to-rare mole ratio on phase investigated Over 99.9% precipitation could be...
Deposition potentials of uranium in 3LiCl–2KCl eutectic based melts were determined on solid and liquid cathodes at the temperature range 550–600 °C. Tungsten metal was taken as a cathode, low melting Ga, Sn, In Zn, well alloys Ga–Sn, Ga–In Ga–Zn mixtures, chosen cathodes.
Behavior of molybdenum was studied in individual fused alkali chlorides and their mixtures employing electrochemical spectroscopic techniques. Formal standard electrode potentials thermodynamics chloride were obtained molten LiCl, NaCl, KCl, RbCl, CsCl at 1123 K, NaCl-CsCl eutectic 793-1023 NaCl-KCl equimolar mixture 973-1123 LiCl-KCl-CsCl 633-1173 K. Diffusion coefficients ions determined melt. Electronic absorption spectra Mo(III) measured salts parameters MoCl 6 3- complex determined.
Anodic dissolution of tungsten was studied at 823–1173 K in the melts based on NaCl–CsCl, NaCl–KCl–CsCl and LiCl–KCl–CsCl eutectic mixtures. The process results formation W(IV) ions. Prolonged contact with silica oxidation ions decreasing concentration electrolyte due to volatile higher state chloro- oxychloro-species. Tungsten electrode potentials were measured NaCl–CsCl using potentiometry.
Speciation and electrochemical properties of molybdenum(IV) tungsten(IV) species were investigated in NaCl–CsCl, NaCl–KCl–CsCl LiCl–KCl–CsCl eutectic based melts between 500–900 o C. Metallic tungsten dissolves anodically, yielding W(IV) ions that are prone to oxidation upon prolonged contact with silica. Electrode potentials fused chlorides measured. Electronic absorption spectra the containing products anodic dissolution recorded. Mo(IV) can be formed by reacting molybdenum dioxide...
Electronic absorption spectra of solutions molybdenum pentachloride in fused alkali chlorides were studied between 450 and 850 o C. LiCl-KCl, NaCl-CsCl, NaCl-KCl-CsCl eutectics NaCl-KCl equimolar mixture used as solvents. Although the experimental contain only one broad band visible region, resolving into overlapping bands revealed two individual components under band. The ratio intensities constituent depends on temperature they are attributed to MoCl 6 - ion 5 molecular species....
Reaction of solutions rare earth chlorides in NaCl–KCl melt with sodium orthophosphate was studied at 750 oC. The earths investigated included yttrium, lanthanum and all lanthanides apart from promethium. initial PO43– : RE3+ mole ratio varied 0.3 to 10 the excess phosphate required for complete conversion RECl3 as well phase composition phosphates produced were determined. At ratios below five only normal REPO4 formed, while above 5 double Na3RE(PO4)2 and/or K3RE(PO4)2 produced....
Reaction of oxygen with solutions neodymium chloride in LiCl and 3LiCl–2KCl melts was studied at 450 °C–750 °C. The reaction resulted the formation oxychloride effect temperature, amount passed through melt (oxygen-to-neodymium molar ratio), gas phase composition (O 2 , O –H O, Ar–O O) on course were considered. Size particles comprising solid precipitates formed determined. High temperature electronic absorption spectroscopy used to determine kinetic parameters (reaction rates, rate...
Electrochemical behaviour of zirconium was studied in LiCl–KCl eutectic based melts at 550–750 °C. Solid (tungsten) and liquid (low melting metals) cathodes were used to determine deposition potentials. Individual gallium, indium, tin zinc, as well binary gallium alloys (Ga–Sn, Ga–In Ga–Zn) the cathode materials.
Reaction of oxygen with solutions uranium tetrachloride in molten alkali chlorides was studied. The experiments were performed LiCl–KCl, NaCl–KCl–CsCl, and NaCl–CsCl eutectic based melts at 450–750 o C. Pure argon–oxygen mixtures (containing ca . 1 10% O 2 ) used. Amount passed through the melt varied from less than one to over 100 moles per mole present. In addition reaction containing a mixture uranium(IV) neodymium investigated. course reactions followed by situ electronic absorption...
Cyclic voltammetry and cathodic polarization measurements were employed to study zirconium uranium electrochemical behavior in LiCl–KCl eutectic based melts on solid (tungsten) liquid (zinc, gallium, indium, Gz–Zn alloy) working electrodes. Deposition potentials of determined. Ga–Zn alloy showed a difference ca. 0.9 V U Zr deposition potentials. Thermodynamically achievable Zr/U separation factor “LiCl–KCl salt melt – alloy” system was experimentally
Abstract not Available.
Electronic absorption spectroscopy was applied for studying the reaction of uranium(IV) chloride with oxygen in alkali based melts. The experiments were performed at 450–750 °C melts on LiCl–KCl, NaCl– CsCl and NaCl–KCl–CsCl eutectic mixtures. Effect diluting an inert gas presence water vapor oxidation also considered.
Reaction of lithium oxide with solutions uranium tetrachloride was studied in LiCl (at 750 °C) and LiCl– KCl 550 based melts. The effect the initial Li2O : UCl4 molar ratio on degree precipitation, phase composition particle size precipitates determined.
Solubility of rare earth oxides in mixtures alkali or alkaline halides was determined by the method isothermal saturation at temperatures up to 1400 o C. The melts studied included CaCl 2 –CaF (20 75 mol. % CaF ), BaCl –BaF (15 73 BaF equimolar and eutectic NaCl–NaF mixtures. Melting points salt were differential thermal analysis effect added oxide on melting point considered. yttrium, lanthanum, cerium, praseodymium, neodymium, samarium determined. temperature, melt composition, presence a...
Precipitation of strontium phosphates from LiCl–KCl–SrCl2 at 550 °C, and NaCl–KCl–SrCl2 NaCl–KCl– CsCl–SrCl2 melts 750 °C was investigated. Sodium phosphate employed as the source ions. The experiments were carried out under static conditions in an inert atmosphere. X-ray powder diffraction analysis for identifying compounds formed particle size distribution curves measured.