NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An electrochemical study of Ni/2+/, Co/2+/, and Zn/2+/ ions in melts of composition CaMgSi2O6Results are reported for a study of the behavior of Ni(2+), Co(2+), and Zn(2+) in molten diopside, determined by cyclic voltametry, as a first step in adapting electrochemical methods for use in experimental geochemistry. The techniques used are described, the theory is briefly discussed, and it is demonstrated that Ni(2+), Co(2+), and Zn(2+) can be reduced, then reoxidized in an uncomplicated case of reversible charge transfer at the Pt electrode. This implies that the neutral metal atoms remain undissolved in the melt. The kinetics of the reduction process, the effects of concentration, the standard reduction potentials, and the diffusion coefficients are discussed in detail. The observations are consistent with the mechanism of Ni(2+) diffusion by transport from site to site. As the proportion of SiO2 in the melt increases, a higher activation energy is required for Ni(2+) to move, and the rate of diffusion is lowered.
Document ID
19830031627
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Semkow, K. W.
(Wisconsin Univ. Madison, WI, United States)
Haskin, L. A.
(Wisconsin Univ. Madison, WI, United States)
Lindstrom, D. J.
(Washington, University St. Louis, MO, United States)
Rizzo, R. A.
(Wisconsin, University Madison, WI, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 46
Subject Category
Inorganic And Physical Chemistry
Accession Number
83A12845
Funding Number(s)
CONTRACT_GRANT: NSG-9055
CONTRACT_GRANT: NAS9-13686
CONTRACT_GRANT: NSF DAR-79-24705
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available