Abstract
The polarizable point charge model is used to explain Mössbauer data on the electric field gradient (EFG) at the iron site in α- and β-LiMnFeF 6. Lattice summations are performed in direct space. The fluorine polarizability which fits the data is in reasonable agreement with the expected value (α F∼ 1.2 A ̊ 3) The dipolar contribution is found to be important. In both cases the main EFG component is positive. In β-LiMnFeF 6, according to the structure, the EFG tensor is axial with respect to the c axis; in α-LiMnFeF 6, the asymmetry parameter η is large (≅0.5) and the OZ axis is along the a axis.
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