Abstract
Magnetic properties of the mixed oxides of sodium and uranium, Na2n−5UOn, (n = 3 and 4), are investigated by both, ESR and magnetic susceptibility measurements. The ∣g∣-factor of U5+ is 3.5 to 4.0 for NaUO3, and the values of ∣g∥∣ and ∣g⟂∣ for Na3UO4, are 0.89 and 0.55, respectively. The magnetic susceptibility of NaUO3, shows an anomalous peak around 32 K, while Na3UO4, is normally paramagnetic. The origin of the observed anomaly for NaUO3, can be attributed to a superexchange interaction between uranium ions through an oxygen ion. Die magnetischen Eigenschaften der Natrium-Uranmischoxide Na2n−5UOn, (n = 3 und 4) werden sowohl mittels ESR als auch mittels Messungen der magnetischen Suszeptibilitat untersucht. Der ∣g∣-Faktor von U5+ betragt 3,5 bis 4,0 fur NaUO3, und die Werte von ∣g∥∣ und ∣g⟂∣ fur Na3UO4, sind 0,89 bzw. 0,55. Die magnetische Suszeptibilitat von NaUO3 zeigt ein anomales Maximum bei etwa 32 K wahrend NaUO4 normalerweise paramagnetisch ist. Die Ursache der beobachteten Anomalie fur NaUO3, last sich einer Superaustauschwechselwirkung zwischen Uranionen uber ein Sauerstoffion zuordnen.
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