J. Phys. Colloques
Volume 41, Numéro C8, Août 1980Fourth International Conference on Liquid and Amorphous Metals
|Page(s)||C8-16 - C8-19|
J. Phys. Colloques 41 (1980) C8-16-C8-19
133Cs NMR INVESTIGATION OF LIQUID Cs-Au ALLOYSR. Dupree1, D.J. Kirby1, W. Freyland2, W.W. Warren3 et Jr.3
1 University of Warwick, Coventry, England
2 Philipps Universitat Marburg, Marburg, West Germany
3 Bell Laboratories, Inc., Murray Hill, New Jersey 07974, USA.
The 133Cs nuclear resonance shifts and spin-lattice relaxation rates have been measured in liquid Cs-Au alloys from pure Cs to 18% excess Au in the compound CsAu. Dissolution of Au in liquid Cs produces a gradual reduction of the Knight shift with increasing Au concentration. Close to stoichiometric CsAu a small residual shift, roughly 5% of the pure Cs Knight shift, is observed. The shift remains small in Au-rich solutions (≤ 1000 ppm), even for excess metal concentrations where on the Cs rich side the shift is ~ 1%. Initially the spin-lattice relaxation rate gradually increases as Au is added t o Cs but at ~ 7% excess Cs it abruptly increases rising to a sharp peak at 5% Cs. We attribute this behaviour to localization of the electrons associated with the excess Cs, probably in the form of F centre analogues.