Abstract
Abstract The Mossbauer isomer shift in intermetallic compounds analysed with the cellular model of Miedema and Van der Woude is composed of three contributions. One of these contributions (R′) is the hybridization of the s and p electrons of a non-transition metal with the d electrons of the Mossbauer atom. In Gd-based compounds R′ is regarded as a constant. In a previous work, on the other hand, we found in Eu-based compounds a strong correlation between R′ and the number of outer p electrons of the non-transition metal. We will show in this study that this correlation is artificial and can be attributed to a volume contraction of the Eu atoms.
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