J. Phys. Colloques
Volume 41, Numéro C8, Août 1980Fourth International Conference on Liquid and Amorphous Metals
|Page(s)||C8-36 - C8-39|
J. Phys. Colloques 41 (1980) C8-36-C8-39
METAL-NONMETAL TRANSITION AND THE MISCIBILITY GAP IN LITHIUM-METHYLAMINEJ.R. Buntaine et M.J. Sienko
Baker Laboratory of Chemistry, Cornell University, Ithaca, N.Y. 14853, USA
The electron spin resonance of lithium-methylamine solutions has been investigated as a function of temperature and concentration. In the nonmetallic regime, the relaxation time increases with temperature in the metallic regime, it decreases. The former is attributed to motionally narrowed hyperfine interaction ; the latter, to lifetime broadened spin-orbit coupling. The change-over appears to occur in the range 13.4-15.6 mole % Li. Kinks in some of the Tle vs. T curves indicate that liquid-liquid phase separation occurs with a consolute point at approximately 200K and 13 mole % Li. Calculation of a Motttype model using an effective dielectric constant suggests that the metal-nonmetal transition should occur at approximately 12 mole % Li. Thus, as in metal-ammonia systems, the metal-nonmetal transition appears to be intimately connected with a miscibility gap.