Accession Number : AD0617581

Title :   HALL EFFECT IN CONCENTRATED METAL-AMMONIA SOLUTIONS,

Corporate Author : TEXAS UNIV AUSTIN DEPT OF PHYSICS

Personal Author(s) : Kyser,D. S. ; Thompson,J. C.

Report Date : 19 AUG 1964

Pagination or Media Count : 1

Abstract : The Hall coefficient was measured in solutions of Li and Na in liquid NH3. The Hall coefficient provides a direct measure of the concentration of unbound (free) electrons. The carrier of electricity in the solution is negatively charged and may safely be presumed to be the electron. At concentrations above 5 mole % (1.8 M), we find almost one free electron per metal atom. In this range, then, the material is metallic in character. As the concentration is decreased below 5 mole %, the free electron concentration drops very rapidly, so that one finds only one free electron per 1000 metal atoms when the concentration of metal atoms is near 2 mole %. The fact that the free electron concentration changes by 1000 while the metal concentration changes by only 2 is difficult to explain. A rapid onset of a metallic state must be taking place. In the absence of spectral data, one cannot assign the identity of the electron traps at the low concentrations. The bound (nonfree) electrons might exist either as solvated electrons or with metal atoms as 'monomers.' (Extracted)

Descriptors :   (*HALL EFFECT, SOLUTIONS(MIXTURES)), (*AMMONIA, HALL EFFECT), (*LITHIUM, HALL EFFECT), (*SODIUM, HALL EFFECT), ELECTRONS, DENSITY, ELECTRICAL CONDUCTIVITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE