| Electroplating of Refractory Metals Using Haloaluminate Melts |
AUG 96 |
6 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
 | Electrochemical and spectroscopic studies of tungsten were conducted in a molten fluoride bath. Oxides were removed by treating the melt with HF gas. The residual oxide content was quantitatively determined using KBrF4 and a zirconia cell apparatus. The reaction products of WF6 and FLINAK were examined using Raman spectroscopy. |
|
| Electrochemical and Spectroscopic Studies of Selected Inorganic and Organic Systems in Molten Halides |
NOV 95 |
39 pages |
| Authors:
Gleb Mamantov; Richard Pagni; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| Electrochemical, spectroscopic and spectroelectrochemical studies of tantalum, niobium, tungsten and rhenium were conducted in molten alkali haloaluminate melts. The melts were in most cases treated with COl4 to remove o) dde. Evidence was found for the formation of metallic tantalum, niobium and tungsten during controlled potential electrolysis in these melts. No conclusive evidence was found for rhenium plating. Reaction sequences, based on experimental data, were proposed for the four metals. ... |
|
| Spectroelectrochemical Investigations of Molten Halide Solutions |
14 JUN 95 |
4 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The main objective of this research, performed by Ellen Kurt Hondrogiannis, a graduate student at the University of Tennessee, was to investigate the utility of the combination of spectroscopy and electrochemistry, or spectroelectrochemistry (SEC), for studies of redox processes in molten halides. Three studies were done in the course of this work. jg p.1 |
|
| AASERT-93: Electroplating of Refractory Metals Using Haloaluminate Melts |
31 AUG 94 |
5 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The main objective of this research, performed by Sven E. Eklund, a graduate student at the Univ of Tennessee, Knoxville, is to explore the fundamentals of electroplating of several refractory metals, such as tungsten and tantalum, from chlorofluoroaluminate melts and to compare with electroplating of these elements from the LiF-NaF-KF eutectic. There has been considerable interest in the electrochemistry and metallurgy of the Groups IV-B, V-B, and VI-B4 transition metals ... |
|
| Spectroelectrochemical Investigations of Molten Halide Solutions |
16 JUN 94 |
5 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The main objective of this research, performed by Ellen Kurt Hondrogiannis, a graduate student at the University of Tennessee, is to investigate the utility of the combination of spectroscopy and electrochemistry, or spectroelectrochemistry (SEC), for studies of redox processes in molten halides. The initial studies involved the use of UV-visible, Raman, and electron spin resonance SEC to identify the radical anion intermediate formed during the electrochemical reduction of tetrachloro-p-benzoquinone, or ... |
|
| Electrochemical and Spectroscopy Studies of Selected Inorganic and Organic Systems in Molten Halides |
14 FEB 94 |
43 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The research during the past year has concentrated on the photochemistry of anthracene and 9-methylanthracene in molten aluminum chloride- 1-ethyl-3-methylimidazolium chloride (AlCl3/EMIC), looking in particular for photoinduced electron transfer reactions. Several such reactions have been found. Experiments demonstrate that this chemistry was initiated by electron transfer from the excited state of 9-methylanthracene to EMI+. The difference in behavior of anthracene and 9-methylanthracene in the basic melt can be attributed to ... |
|
| Electrochemical and Spectroscopic Studies of Molten Halides |
08 JAN 93 |
76 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| This program deals with chemistry and electrochemistry in molten halides, media which are used in the production of several important elements, such as aluminum, magnesium and fluorine, in some high energy battery systems, as well as in other applications. The emphasis was placed on simple and complex chlorides and fluorides, for example the LiCl-KCl eutectic, the LiF-NaF-KF eutectic (FLINAK), alkali metal and organic tetrachloroaluminates, and cryolite. Pure fluorides usually have ... |
|
| Electrochemical and Spectroscopic Investigation of Molten Chloroaluminates and Related Solvents |
07 NOV 88 |
76 pages |
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The following is a summary of research accomplishments and progress made during the period September 15, 1985 through September 14, 1988: Development of Spectroelectrochemical and other methodology for alkali chloroaluminates- UV- visible absorption spectroelectrochemistry; Infrared spectroscopy and spectroelectrochemistry; Raman spectroscopy and spectroelectrochemistry; Studies with ultramicroelectrodes; Electrochemical and other studies of selected redox systems- Tungsten species in sodium chloroaluminate melts; Electrochemical studies of carbondioxide and hydrochloric acid in molten alkali chloroaluminates; ... |
|
| Proceedings of the Joint International Symposium on Molten Salts. Held in Honolulu Hawaii on 18-23 October 1987. Volume 87-7 |
87 |
1177 pages |
| Authors:
Gleb Mamantov; Charles Hussey; Marie-Louise Saboungi; Milton Blander; Charmaine Mamantov; ELECTROCHEMICAL SOCIETY INC PENNINGTON NJ
|
| The Joint Internation Symposium on Molten Salts was held 18-23 October 1987 in Honolulu, HI. Topics emphasized include fundamentals and applications of room-temperature haloaluminates, molten salt batteries, molten- metal solutions and their application to extractive metallurgy by electrochemical techniques, and nuclear processes utilizing molten salts media. The symposium on Spectroelectrochemistry and Electroanalytical Science was held at the joint meeting of the Electrochemical Societies of the United States and of Japan. ... |
|
| Evaluation of Low Melting Halide Systems for Battery Applications |
MAR 1981 |
|
| Authors:
Gleb Mamantov; Cedomir Petrovic; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
 | This three year program involves evaluation of selected low temperature molten salt solvent systems containing inorganic and/or organic chlorides and bromides for battery applications. The research involves determination of the liquidus temperatures, the specific electrical conductivity, and the electrochemical span of selected halide systems. Characterization of the solvent species by Raman spectroscopy, vapor pressure measurements, and the electrochemical study of a few cathode and anode systems will be undertaken for ... |
|
| Low Temperature Fluorine Chemistry of Electronegative Elements. |
15 JUL 1980 |
|
| Authors:
Gleb Mamantov; Richard A. Crocombe; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| This program was concerned with the synthesis and characterization of fluorine-containing compounds by novel methods. A detailed study of the systems X2 + F2 where X = Cl, BR, or I was carried out, producing evidence for the new species XF2, X2F and X2F2 as well as some of the normally unfavored members of the series XFn (n = 1, 3, 5). High resolution infrared spectra of the interhalogen compounds ... |
|
| Evaluation of Low Melting Halide Systems for Battery Applications. |
NOV 1979 |
|
| Authors:
Gleb Mamantov; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| This three year program involves evaluation of selected low temperature molten salt solvent systems containing inorganic and/or organic chlorides and bromides for battery applications. The research involves determination of the liquidus temperatures, the specific electrical conductivity, and the electrochemical span of selected halide systems. Characterization of the solvent species by Raman spectroscopy, vapor pressure measurements, and the electrochemical study of a few cathode and anode systems will be undertaken for ... |
|
| Low Temperature Fluorine Chemistry of Electronegative Elements. |
15 APR 1977 |
|
| Authors:
Gleb Mamantov; Norman R. Smyrl; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| Several new interhalogen species have been prepared and characterized by matrix isolation methods. Bromine difluoride, dibromine fluoride, and dibromine difluoride have tentatively been identified by infrared matrix isolation spectroscopy. These species were formed in a number of different experiments utilizing both UV-photolysis and microwave discharge excitation. The chlorine and bromine hexafluoride radicals have been prepared by gamma-radiolysis of approximately five mole percent of the precursor molecule (chlorine or bromine pentafluoride) ... |
|
| Low-Temperature Fluorine Chemistry. |
15 JUL 1971 |
|
| Authors:
Gleb Mamantov; M. R. Clarke; TENNESSEE UNIV KNOXVILLE DEPT OF CHEMISTRY
|
| The program dealt with certain aspects of low-temperature fluorine chemistry of chlorine, nitrogen and oxygen. A new interhalogen radical, ClF2, was prepared and characterized through its infrared spectrum. At least one more new chlorine-fluorine species has been prepared by photolysis of Cl2/F2/Ar mixtures, but it was not identified. Low-temperature mass spectrometry of fluorine-containing compounds was studied using the cryogenic inlet system built for the Hitachi-Perkin-Elmer mass spectrometer. (Author) |
|
Reports by Author
