Abstract
The Knight shift K in liquid NaK and NaRb systems is a linear function of the relative Na-concentration 1− C. The relative variation K -1( ∂K ∂C ) = 0.361 for Na 23 in NaK, = 0.518 for Na 23in NaRb and = 0.270 for Rb 87in NaRb. An interpretation in terms of the scattering theory of conduction electrons is given. The line width of the Na 23 and Rb 87 resonances is a non-linear function of C. It is about a factor 5 larger in the Rb-rich alloys than at the Na-rich end. This result can be explained by the electron-coupled spin exchange interaction between different nuclei. The remarkable fact that these spin-spin interactions do not average to a small value in the liquid metals necessitates the postulate of a long range character for the electron-coupled interaction. The Knight shift and line width in solid terminal solutions have also been observed and compared with theory. The experiments show that nuclear magnetic resonance is particularly well suited to determine phase diagrams of alkali alloy systems.
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