Abstract
Available M\ossbauer quadrupole-splitting (QS) data for Fe${\mathrm{Cl}}_{2}$ are analyzed in terms of crystal field and covalency parameters. It is shown that the temperature variation of QS in the paramagnetic phase is consistent with a large expansion of the $3d$ electronic charge density distribution (${\ensuremath{\alpha}}^{2}=\frac{〈{r}^{\ensuremath{-}3}〉}{{〈{r}^{\ensuremath{-}3}〉}_{0}}\ensuremath{\approx}0.4$) as was previously predicted from the systematics of QS and isomer shift in the halides. The analysis yields a large ratio of 8.4 between the trigonal field component and the spin-orbit coupling constant, which is consistent with the Ising model proposed by Kanamori for the low-temperature magnetic properties of Fe${\mathrm{Cl}}_{2}$.
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