The angular distributions of gamma -rays from Pr-142, Nd-147 and Pm-144 in
Pr0.5Nd0.5Ni were investigated by means of low-temperature nuclear orientat
ion. The results show that the Pr and Nd electronic moments order along the
c- and a-axis, respectively. Pm ions introduced as a very dilute magnetic
impurity, preferentially align with the Nd ions.