Abstract
The 21.7 keV nuclear gamma resonance of 151Eu was used for studying the inhomogeneous mixed-valent compound Eu 3S 4 in the pressure range 0–15 kbar. At room temperature the activation energy for electron hopping between the crystallographically equivalent divalent and trivalent Eu sites was found to decrease with pressure by d E a /d P=-1.8±0.3 meV kbar -1. No change of the mean valence of Eu with pressure was observed.
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