Fitting of Several Fe-Based Metallic Compounds Results in an Isomer-Shift—Electronic-Configuration Diagram

Abstract

An "isomer-shift—electronic-configuration" diagram is proposed for metallic compounds of iron, formed by theoretical charge density of Wakoh and Yamashita and Danon's $\delta$ scale. On the basis of this diagram, we show, in disagreement with previous interpretations of Mössbauer data based on the Walker et al. diagram, that the small dispersion of $\delta$ values, observed for several metallic compounds of iron, does not necessarily mean that the number of $3d$ electrons is nearly constant.