Investigating the magnetic ordering at low temperatures in U3O7
Uranium(IV) oxide (UO2) exhibits a typical fluorite-type structure. When oxidized, a number of mixed-valence oxide phases are formed which induce a gradual structure modification. The compounds U4O9 [50% U(IV) + 50% U(V)] and U3O7 [33% U(IV) + 67% U(V)] consist of fluorite-derived structures involving long-range ordering of oxygen clusters. The structures of UO2 and U4O9 have been well characterized throughout the years, and very recently our group achieved also significant progress on U3O7. In UO2 an AFM transition occurs around 31K, with a reported magnetic moment of 1.8 µB. In recent investigations performed at ILL (D4) by some of our co-proposers possible short range paramagnetic behaviour at room temperature was found in U4O9. About a decade ago, some colleagues of our institute similarly found magnetic structures in pure pentavalent uranium compounds, e.g. NaUO3 having a magnetic moment of 0.2 µB. We propose to investigate possible magnetic ordering at low temperature in the U3O7 compound to complete the information base on these related compounds. Such knowledge is necessary also in the context of theoretical calculations and modelling work.
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LEINDERS Gregory and RITTER Clemens. (2019). Investigating the magnetic ordering at low temperatures in U3O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-493
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