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/sup 161/Dy Moessbauer spectroscopy studies of divalent and trivalent dysprosium halides and oxyhalides

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic00162a030· OSTI ID:5507555
/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.
Research Organization:
Centre de Recherches Nucleaires, Strasbourg, France
OSTI ID:
5507555
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 22:20; ISSN INOCA
Country of Publication:
United States
Language:
English

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