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- W2007298002 abstract "By dissolving Np metal in a mixed solution of NaCl, MgCl2 and Na2SO4 in water, a new compound NpOH precipitates together with NpH2−x forming a solid solution (double salt) NpOH·NpH2−x. 237Np Mössbauer spectroscopy, d.c. magnetization and X-ray studies of the precipitate are reported. NpOH crystallizes in the CaF2 (Fm3m) structure with a lattice parameter of 5.375 Å. The Mössbauer absorption spectrum of NpOH is very well resolved from that of NpH2−x (single absorption line) owing to their large difference in Mössbauer isomer shift (IS; 28.1 mm s−1). The Mössbauer studies indicate that the Np ion in NpOH is tetravalent whereas in NpH2−x it is trivalent. Both behave paramagnetically down to 2.5 K; however, NpOH exhibits paramagnetic spin relaxation. The Mössbauer spectra can be fitted within a relaxation model assuming an isolated Kramers doublet and, even better, assuming a quartet ground state (T8(2) of 4I92 in cubic symmetry). The saturation hyperfine field derived is 350(50) T. NpH2−x in the solid solution exhibits a positive IS relative to NpH2.0 as a result of volume contraction. The IS of the neptunium dihydride system depends on the hydrogen concentration. From this result we derive for NpH2−x stabilized in the solid solution the value x≈0.4." @default.
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- W2007298002 date "1995-07-01" @default.
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- W2007298002 title "Mössbauer effect and magnetization studies of mixed valence solid solution NpOH·NpH2−x" @default.
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- W2007298002 doi "https://doi.org/10.1016/0925-8388(94)07110-1" @default.
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