Role of Boron in Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ System

The influence of boron atoms on the magnetic properties of Νd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ (i.e. ΝdCo$\text{}_{5}$, NdCo$\text{}_{4}$B, Νd$\text{}_{3}$Co$\text{}_{11}$Β$\text{}_{4}$ and Νd$\text{}_{2}$Co$\text{}_{7}$Β$\text{}_{3}$) compounds has been studied. These structures are based on the well-known CaCu$\text{}_{5}$ structure. They all have the hexagonal symmetry and belong to the space group of P6/mmm. The experimental values of the Curie temperatures (T$\text{}_{c}$) of Nd(Co$\text{}_{1-x}$B$\text{}_{x}$)$\text{}_{5}$ are used to calculate the effective intersublattice exchange interactions (J$\text{}_{NdCO}$) between Nd and Co sublattices. As the Β content increases, a tendency to decrease in J$\text{}_{NdCO}$ and T$\text{}_{c}$ is found. This variation is compared with that observed for the Co magnetic moment.