Abstract
New syntheses of well characterized samples of the neptunium oxychalcogenides NpOZ (Z = S, Se) are described. Both compounds are tetragonal with the PbFCl-type crystal structure. Magnetic susceptibility, Mössbauer spectroscopy and neutron diffraction measurements have been carried out on polycrystalline samples. Both compounds undergo antiferromagnetic ordering below 4.2 K for NpOS and 11 K for NpOSe. The ordered moment values are 0.82 and 1.64μ B for NpOS and NpOSe, respectively. Both compounds seem to be ionic with a valency 4+ on the Np atoms. The magnetic moments are aligned along the c-axis with the (+ - + -) sequence in NpOSe. Based on crystal field model and molecular field approximation, tentative interpretations are given for the magnetic properties of NpOS and NpOSe.
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