THE ELECTRICAL CONDUCTIVITY OF SOLUTIONS OF METALS IN THEIR MOLTEN HALIDES. VI. LANTHANUM, CERIUM, PRASEODYMIUM, AND NEODYMIUM IN THEIR MOLTEN IODIDES

Journal Article · Wed May 01 04:00:00 EDT 1963 · Journal of Physical Chemistry (U.S.)

DOI:https://doi.org/10.1021/j100799a053· OSTI ID:4702541

Dworkin, A S; Sallach, R A; Bronstein, H R; Bredig, M A; Corbett, J D

The electrical conductivities of solutions of the series La, Ce, Pr, and Nd in their molten triiodides are similar to those of the corresponding chloride systems, and thus likewise reflect the gradual increase in stability of the dipositive ion M/sup 2+/. For example, in solutions containing 15 mole% metal, the specific electronic contribution kappa /sub soln/- kappa /sub salt/ decreases from 22 and 25 ohm/sup -1/ cm/sup -1/ for La and Ce, respectively, to 4 for Pr and approximates O for Nd. The positive temperature dependence of the conductivity in the concentration range where electronic contribution is sizable indicates that there is thermal excitation of electrons from the solute. The phase equilibrium diagrams near the MI/sub 3/ and MI/sup 2+/ compositions are discussed in terms of the solute species. The MI/sub 3/ liquidus data are compatible with the postulated M/sup 2+/ solute or its dissociation into M/sup 3+/ and anionlike electrons. The metallic character of the molten diiodides, which are metal-like (M/sup 3+/(I/sup -/)/sub 2/e/sup -/) in the solid st ate, appears to decrease in the melt in the order La> Ce> Pr. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.; Ames Lab., Ames, Iowa
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-028888
• OSTI ID: 4702541
• Journal Information: Journal of Physical Chemistry (U.S.), Journal Name: Journal of Physical Chemistry (U.S.) Vol. Vol: 67; ISSN JPCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANIONS
CERIUM IODIDES
CHEMISTRY
ELECTRIC CONDUCTIVITY
ELECTRONS
EXCITATION
HALIDES
LANTHANUM IODIDES
MELTING
NEODYMIUM IODIDES
PHASE DIAGRAMS
PRASEODYMIUM IODIDES
QUALITATIVE ANALYSIS
SOLIDS
SOLUTIONS
STABILITY