Abstract
The behaviour of 4f and 5f electron structure under reduced volume was investigated by high-pressure Mössbauer spectroscopy in compounds of europium, dysprosium, and neptunium. The study of 4f systems is limited for technical reasons to the heavy elements. There the main case of instability is valence fluctuations between well localized neighbouring 4f 1 configurations. In the light 5f systems, for which neptunium is taken as an example, the central question is the delocalization of 5f electrons via 5f-5f overlap or 5f-ligand electron hybridization. Characteristic features of the high-pressure Mössbauer spectra which give insight into these problems are presented. The most challenging cases in Np intermetallics are those with the AuCu 3 structure. Recent data on several such systems are discussed.
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