Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts a review

Cover of: Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts |

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC, Springfield, Va .

Written in English

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Subjects:

  • Heat resistant alloys.,
  • Actinide elements.

Edition Notes

Book details

StatementNarottam P. Bansal.
SeriesNASA technical memorandum -- 105862.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17676688M

Download Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts

@article{osti_, title = {Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts: A review}, author = {Bansal, N.P.}, abstractNote = {The applications of chronopotentiometry to the study of electrochemical behavior of three technologically important areas of refractory metals, actinides, and oxyanions in molten salts are critically reviewed.

Get this from a library. Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts: a Chronopotentiometry of refractory metals. [Narottam P Bansal; United States. National Aeronautics and Space Administration.].

Chronopotentiometry of refractory metals, actinides and oxyanions in molten salts: A review Technical Report Bansal, N.P. The applications of chronopotentiometry to the study of electrochemical behavior of three technologically important areas of refractory metals, actinides, and oxyanions in molten salts are critically reviewed.

Electrodeposition of refractory metals • Impossible to conduct in aqueous solutions (except Cr) • Many studies using high temperature molten salts • In general, alkali fluoride or alkali chloride-fluoride melts at high temperature ( – ºC) give better deposits.

• Katagiri et. File Size: 1MB. The electrodeposition of metals from non-aqueous solutions, such as conventional organic solvents, ionic liquids and molten salts, is presented. The application of the above-mentioned solutions makes possible obtaining the cathodic deposits of metals or metallic alloys that cannot be deposited by the traditional electrolysis of aqueous by: Molten LiCl–KCl serves as the electrolyte into which actinides (including uranium and plutonium), rare earths, and other active metals from the fuel are partitioned after being oxidized to Author: Jinsuo Zhang.

Chronomamperometry (CA) was used to study the nucleation and growth mechanism of actinides (e.g. U, Pu) on tungsten electrode. CA is a method widely used to study nucleation phenomena in aqueous.

Technical documents from NASA. This banner text can have markup. Accepted 15 May ) Summary A review of the polarography of oxyanions in molten salts is presented. INTRODUCTION THE electrode reactions of oxyanions in molten salts are especially interesting because in many cases they are unique to high temperature systems and cannot be studied in aqueous or non-aqueous systems at room by: molten salts, e.g.

diffusion coefficients, apparent stan-dardpotentials,firststud-ies on the electrochemical properties of actinides in molten salts started during the 50s with of uranium in manychloride-basedmelts: forexampleMgCl 2-NaCl-KCl, NaCl-KCl, LiCl-NaCl-CaCl 2-BaCl 2 and in the.

Actinide chemistry (or actinoid chemistry) is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides derive their name from the group 3 element actinium.

The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. All but one of the actinides are f-block elements. The problems of actinide molten salt coordination chemistry are considered in Chronopotentiometry of refractory metals of spectroscopic parameters as functions of melt composition and temperature.

Parameters connected with energy, intensity and fine structure of 5f-5f transitions have been obtained for molten alkali metal chlorides, fluorides and chloride-fluoride by:   Rare earth (RE) metals and their alloys have attracted considerable practical interests due to their functional properties.

Because of their negative deposition potentials, RE metals cannot be electrochemically deposited from aqueous media. Using molten salt as medium provides a unique opportunity for the electrowinning and electrorefining of high-purity RE metals, as well as for the Cited by: 9.

The molten salt selected is LiF-LiCl for the bismuth pool production Different bismuth-lithium pool production in various molten salt: [6] M. Gibilaro and al., “On the use of liquid metals as cathode in molten fluorides", J.

Elect. Chem.,p (). The actinide series includes elements In this lesson, we will learn what characteristics these elements share, how they are used, and how they were discovered.

Lester R. Morss is the Program Manager for Heavy Element Chemistry at the Office of Science, U.S. Department of Energy in Germantown, Maryland, USA. He was taught actinide chemistry fbyProfessor Burris B.

Cunningham, his Ph.D. mentor at the University of California, Berkeley and from to he was a member of the chemistry faculty at Rutgers University, New Brunswick, New Jersey, : $ Actinide metals • Preparation of actinide metals Reduction of AnF 3 or AnF 4 with vapors of Li, Mg, Ca or Ba at – °C Other redox methods are possible Thermal decomposition of iodine species Am from Am 2 O 3 with La * Am volatility provides method of separation • Metals tend to be very dense U g/mL Np g/mLFile Size: 7MB.

--Lanthanide and Actinide Chemistry, Simon Cotton, Uppingham School, Uppingham, Rutland, UK Lanthanide and Actinide Chemistry is a one-volume account of the Lanthanides (including scandium and yttrium), the Actinides and the Transactinide elements, intended as an introductory treatment for undergraduate and postgraduate students/5(5).

The rare earths represent a group of chemical elements,&#;the lanthanides, together with scandium and yttrium, which exhibit similar chemical properties.&#; They are strategically important to developed and developing nations as they have a Pages: A rare-earth element (REE) or rare-earth metal (REM), as defined by the International Union of Pure and Applied Chemistry, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium.

Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and. Buy Rare-Earths and Actinides in High Energy Spectroscopy (Progress in Theoretical Chemistry and Physics Book 28): Read Books Reviews - Monitoring of Actinide Concentrations in Molten LiCl-KCl Salt using Alpha Spectroscopy PI: Dr.

Lei R. Cao, The Ohio The ability to monitor actinides to prevent and detect the misuse of SNM throughout the concentrations in molten salt and test it in a real salt environment up to °C.

The novel. Actinides, were mostly discovered in the early to mid s, after rare earths were a "thing". Other than U and Th, you do not find them in nature. You do not mine. Corrosion of nickel, iron, cobalt and their alloys in molten salt electrolytes.

Journal of Materials Science30 (22), DOI: /BFCited by: () -- A Livermore researcher who teamed with a United Kingdom collaborator has published an article in Reviews of Modern Physics that refines decades of actinide science and may just.

Actinide elements and their chemistry have a significant number of applications. Bringing together contributions from the leading experts in the field, Recent Advances in Actinide Science covers six main topics: * Analysis, the environment and biotransformations * Coordination and organometallic chemistry * Heavy elements * Nuclear fuels, materials and waste forms * Separations and solution.

Actinides and the Sources of Cosmic Rays B. Pfeiffer aK.-L. Kratz R.E. Lingenfelterb J.C. Higdonc aInstitut f¨ur Kernchemie, Universit¨at Mainz, Germany bCASS, University of California San Diego, La Jolla, USA. cW.M. Keck Science Center, Claremont, USA Abstract The abundances of the actinide elements in the cosmic rays can provide critical.

Carbon electrodeposition in molten salts: electrode reactions and applications. Happiness V. Ijije, Richard C. Lawrence and George Z. Chen * Department of Chemical and Environmental Engineering, Energy and Sustainability Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.

E-mail: @d by: rather than by free electrons (as in a metal). Electrolytes include water solutions of acids, bases, or salts; certain pure liquids; and molten salts. Gases may act as electrolytes under conditions of high temperature or low pressure.

All inorganic acids, bases, and salts are electrolytes. Get an answer for 'Describe the relationship between the solubility of the salts containing alkaline earth metal ions and the position of the metals in the periodic table.' and find homework help.

Route to Separation of Actinide Metals from Rare Earth Metals via Conversion to Chlorides. Parker Okabe 1, Devin Rappleye 2, and Michael F. Simpson 1. 1 University of Utah, Department of Metallurgical Engineering. 2 Lawrence Livermore National Laboratory. Separation of actinides from rare earths has important applications both related to rare earth metal extraction and closing the nuclear.

The determination of actinide elements by alpha spectrometry measurement is an essential part of many environmental research, bioassay, and monitoring programs. Alpha spectrometry measurements identify and quantify the alpha-emitting actinide elements.

A variety of separation methods will typically precede the electrodeposition of a sample for alpha spectrometry measurements. Actinide removal from molten salts can be accomplished by a two step process where the actinide is first oxidized to the oxide using a chemical oxidant such as calcium carbonate or sodium carbonate.

After the actinide is precipitated as an oxide the molten salt is distilled away from the actinide oxides leaving a oxide powder heel and an actinide free distilled salt that can be recycled back Cited by: 1. Molten Salt Actinide Chem.

4 Electrochemical methodologies Cyclic Voltammetry Time P o t e n t i a l Time Time P o t e n t i a l C u r r e n t Redox potentials, electrochemical reaction rates of the compounds, and intermediates Chronoamperometry Chronopotentiometry 3/2 1/2 1/2 3 1/2 n AD Cv RT F ip Randles-Sevick equation t n F AC i D1/2.

Separation of lanthanides: Solution having mixture of lanthanides is passed through a column packed with particles of a suitable ion exchange resin. Cations present in solution undergo exchange with hydrogen with hydrogen ions.

Separation of actin. actinides (Major actinide: U, Th, Pu and minor actinide: Am, Cm, Np, etc.) in biological materials represents a significant challenge due to their extremely low concentrations and the diverse matrix chemistry of these samples 1,3 4). The actinides determination procedure in bioassays should beFile Size: KB.

MENTSFrom commercial actinide oxides to single crystals of their metals and refractory compounds. Journal de Physique Colloques,40 (C4), ￿/jphyscol￿.

￿jpa. METALS AS A FUNCTION OF PRESSURE AUTHOR(S), One Ericsson, J. Wills, ~S6derlind, Joost Melsen, R. Ahuja, A. Boring, and mn SUBMITTEO TO: Proceedingsof the Actinides InternationalConference SeptemberDISCLAIMER ‘fhis repoti was prepardascccm of work s~n~~ by an aaen~ of the fJnii~ stat= Government.

The Chemistry of the Actinide and Transactinide Elements: v. by R. Morss,available at Book Depository with free delivery worldwide. Chemical Thermodynamics of Uranium is the first book in a series of monographs providing a critical review of the thermodynamic properties of the actinide elements and their compounds; it was followed by monographs on neptunium, plutonium, americium and technetium and their compounds.

The absolute refractory period is due to actions involving the _____ returning to the status of their resting membrane potential state (being reset).

voltage-gated sodium channels When a researcher applies the Nernst equation, the measured resting membrane potential best approximates the. A method of determining the radioactivity of specific actinides that are carried in urine or fecal sample material is disclosed.

The samples are ashed in a muffle furnace, dissolved in an acid, and then treated in a series of steps of reduction, oxidation, dissolution, and precipitation, including a unique step of passing a solution through a chloride form anion exchange resin for separation Cited by: Degradation of two types of anion exchange resins, Dowex 11 and Reillex HPQ, from the action of concentrated nitric acid (4 to 12 M) and radiolysis [from depleted uranium as UO2 2+ nitrate species and Pu as Pu(IV) nitrate species] was followed as a function of time with Raman vibrational spectroscopy.

Elevated temperatures (~ 50 degrees C) were used in the absence of actinide metal loading Cited by: 9.

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