Investigation of Hyperfine Interaction and Structure in FeSiF₆·6HO₂ by Mössbauer Measurements

Abstract Mössbauer, proton resonance, and susceptibility measurements ( T ≦ 4.2 K) on FeSiF 6. · 6H 2 O can be understood with the hypothesis that there are three equivalent Fe(II) sites related by C 3 operation and the effective symmetry of the ligand field at each Fe(II) ion site is c 2h (or lower). The nonaxial susceptibility tensor χ is related to the measured axial tensor χ m by the equation χ m = ⅓(χ + C 3 χ C 3 −1 + C χ C ). A new interpretation of proton resonance measurements on single crystals yields χ xx /χ yy = 1,54 being in good agreement with the value deduced from Mössbauer powder spectra. The hyperfine constants are reconsidered. The quadrupole moment Q of the 14.4 keV 57 Fe state is determined to be Q =0.20 b.

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