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The present study of Np(2)Ir(2)In completes the (237)Np Mossbauer spectroscopy investigations of Np(2)T(2)X, where: (T = Co, Rh, Ir, Ni, Pd, Pt and X = In, Sn) compounds. In the paramagnetic state, the spectrum consists of a pure quadrupolar splitting (|e(2)qQI approximately 32 mm/s) of a single Np crystallographic site. The value of the isomer shift (delta(is) approximately -14 mm/s versus NpAl{2}) corresponds to a Np(4+) charge state. Np(2)Ir(2)In is found to order at ~30 K and the complex Mossbauer spectra suggest the occurrence of a non-collinear modulated magnetic structure. At 4.2 K, the spectrum can be reproduced assuming five different hyperfine fields ranging from 67T to 227T. This distribution leads to an average magnetic moment on the neptunium (u(Np) approximately 0.76u(B). The magnetic properties of Np(2)Ir(2)In are consistent with the general trends observed in the An(2) T(2)X (An = U, Np) isostructural family.

Additional information

Authors: COLINEAU E, ITU-Karlsruhe (DE);WASTIN F, ITU-Karlsruhe (DE);REBIZANT J, ITU-Karlsruhe (DE)
Bibliographic Reference: Oral Report delivered at: NMM 2000 Nuclear Methods in Magnetism, Hosted at: Rio de Jeneiro (BR) 2-4 August 2000
Record Number: 200013010 / Last updated on: 2001-01-24
Original language: en
Available languages: en
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