Abstract
The NMR spectra of 59Co and 11B in the intermetallic borides (Co1-xMnx)B (01-xFex)B (059Co in these alloys. The contribution of the impurities to the relaxation of the longitudinal nuclear magnetisation of 59Co is characterised by a dependence on time that is described by exp(-(t/ tau li)12/): this indicates that the relaxation of the 59Co nuclei arising from the presence of the impurities is diffusionless.