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Magnetic susceptibility of the Van Vleck paramagnet Cs5Eu(N3)8

The magnetic susceptibility of the new compound Cs5Eu(N3)8 has been measured in the temperature range from 77 to 300 K. From excitation and luminescence spectra the compound is known to contain two distinct but very similar Eu3+ sites with approximately D4d microsymmetry. The experimental susceptibility data are interpreted in terms of the Van Vleck theory for closely spaced multiplets. A perfect fit to this model is obtained on the assumption that the two sites with energies as observed in the emission spectra are present in equal proportions.