On the magnetic anisotropy of caesium hexachlorouranate (IV)

The magnetic susceptibility and anisotropy of the hexagonal salt Cs2UCl6 were measured from 80 to 300 K and found to be essentially independent of temperature. The results were interpreted using a parameterized crystal field model. k was found to be 0.93, but the L C3-U-Cl deduced does not agree with the value known from the structure for any reasonable range of the crystal field parameter p2. It is deduced that the next state, T4( O h), above the ground T1 state should be split by 50 cm-l. This is in fair agreement with the value observed from the spectrum, 82 cm-1.