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This article describes synchrotron radiation experiments on single crystals of NpS and PuSb carried out in order to examine the magnetism by using the technique of x-ray resonance exchange scattering (XRES). In the case of NpS the results augment our knowledge of the magnetic phase transition, and, by measuring the ratio of the intensities at the M(5) and M(4) energies it is suggested that the electronic configuration of NpS is trivalent Np (3+). In the case PuSb the experiments have been unable to observe magnetic scattering. The interpretation given is that an absorbing layer of approximately 1 µm exists on the surface of the single crystals. No powder diffraction peaks (eg from PuO(2) or PuSb) could be detected from this layer, indicating that it is either amorphous or small grain. An extended x-ray absorption fine structure (EXAFS) type analysis shows tha the overlayer consists primarily of plutonium and oxygen. It is suggested that this may be caused preferentially in the Pu-containing samples because of the alpha-particle activity present in (239)Pu.

Additional information

Authors: MANNIX D ET AL, University of Liverpool, Department of Physics (GB);LANGRIDGE S ET AL, JRC Karlsruhe (DE);NUTTALL W J, University of Keele, Department of Physics (GB);COBURN S, Brookhaven National Laboratory, Department of Physics, Upton (US);WASSERMAN S ET AL, Argonne National Laboratory, Chemistry Division (US)
Bibliographic Reference: Article: Physical Review B (1997)
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