Nuclear magnetic resonance in silver-cadmium

Abstract

Nuclear magnetic resonance shifts and line widths have been measured in alloys of silver and cadmium at 300% in a field of 4200 gauss. The resonances of ¹⁰⁹Ag and ¹⁰⁷Ag nuclei were observed in the α and β phases and those of ¹¹³Cd and ¹⁰⁷Cd nuclei in all the room temperature phasos. In primary solutions of cadmium in silver, the Knight shifts of all the resonances decrease linearly as the cadmium content increases, the total variation heing about 14 % of their values at the centre of the phase rangc. It is shown that in a disordered alloy a contribution to nuclear magnetic resonance line width can arise from the variations of the shifts of nbclei with thsir immediate surroundings. The results suggest that in a silver–cadmium alloys, the influence of the cadmium atoms on the shift of silver nuclei is confined to nearest and next noarost neighbows. Line widths in the β phase suggest an ordered structure. The relation of nuclear magnetic resonance shifts to the density of statee at the Fermi surface is discussed and a calculation of the variation of this quantity with composition made from tho Knight shift results. The result is compared with other experimentd and theoretical evidence.