ESR STUDY OF SPIN DYNAMICS IN KXKCL1-X MELTS S-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-10(-1)) APPROACHING THE M-NM TRANSITION

ESR-spectra of a metal-molten salt solution (KxKCl1-x) have been measu red for the first time over a wide composition range (10(-4) less than or equal to x less than or equal to 10(-1)) at 800 degrees C. Emphasi s has been given to a precise control of composition by in situ coulom etric titration. The spin susceptibility exhibits strong deviations fr om a simple Curie limit over the whole x-range studied. A narrow line width of 0.2 mT is observed in non-metallic salt rich solutions. It in creases significantly approaching the non-metal-metal transition. The characteristics of the spin dynamics strongly support the current pict ure of electron localization in these melts.