Magnetic Behavior of Polycrystalline Neodymium, Holmium, and Erbium from 300 to 1500°K

The paramagnetic susceptibilities of polycrystalline Nd, Ho, and Er have been determined from about 300 to 1500°K by the Faraday method. The inverse paramagnetic susceptibility versus temperature $\text{(1/χ\hspace{0.17em}}\mathrm{vs}\mathrm{\hspace{0.17em}T)}$ curve for Nd at high temperatures show two slight anomalies associated with a solid state phase transformation and the melting point, respectively. The paramagnetic susceptibility of hcp Nd does not satisfy the Weiss-Curie law due to the partial population of the energy levels above the ground state ${}^4{I}_{\text{9/2}}$ , The paramagnetic susceptibility of Ho and Er is representable by the Weiss-Curie law. The experimental Bohr magneton numbers are in satisfactory agreement with those predicted by the Van Vleck theory.