Nuclear magnetic resonance studies of liquid metal alloys

The Knight shift K and quadrupolar relaxation rate R_q in liquid metallic systems, in which effects of bonding become increasingly prominent, are surveyed. In Rb, a theoretical calculation of R_q, including mode-coupling theory for the liquid, and the r-dependent Sternheimer factor, predicted closely the recent experimental redetermination. In Ge and in Cu-Ge and similar nearly free-electron systems, the quantitative analysis of K still poses problems, while qualitatively K(x) displays clearly a correspondence to the resistivity maximum. In metallic alloys with compound forming tendency, models based on an association (A+B from or to AB) connect K and R_q quantitatively with the heat of mixing, but the microscopic foundation of the association ansatz is uncertain.