Abstract
/sup 161/Dy (dysprosium 161) hyperfine interaction measurements are reported for the dysprosium dihalides DyX/sub 2/, trihalides DyX/sub 3/, and oxyhalides DyOX (X = chlorine, bromine, iodine (Cl, Br, I)) using the 26-keV Moessbauer resonance. In the dihalides, the electron configuration of dysprosium is divalent (4f/sup 10/). However, it has been impossible to obtain pure phases of these compounds. The oxyhalides order antiferromagnetically below 10 K. The hyperfine parameters and the magnetic ordering in these compounds are interpreted in terms of electronic structure with use of a Hamiltonian including electric crystal field and magnetic exchange effects. The change of mean square nuclear radius of /sup 161/Dy between the ground and 26-keV levels (..delta..(r/sup 2/) = 8.0 x 10/sup -3/ fm/sup 2/) is deduced by combination of the isomer shift results with free-ion electron density calculations. 8 figures, 6 tables.
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