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[en] The 59.5 keV Mossbauer resonance of 237Np has been measured in Np3S5 at 77 and 4.2 K. At 77 K, two different quadrupolar splittings are observed. The first one (delta1 = - 5(1) mm sec-1/NpAl2) is assigned to the Np4+ ions and the second one (delta2 = 28(1) mm sec-1/NpAl2) is assigned to the Np3+ ions. At 4.2 K the spectrum gives a ratio of areas S(Np3+)/S(Np4+) of 2.0. These results clearly confirm the crystallographic data of this mixed-valence material. (author)
Journal
Solid State Communications; ISSN 0038-1098; 
; v. 40(12); p. 1065-1066
; v. 40(12); p. 1065-1066