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 (1/χ vs 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 I9/24, The paramagneticsusceptibility 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.
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Arajs et al. (1960) studied this question.
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