57Fe Mössbauer spectroscopy of pseudo-1D sulfide of FePb4Sb6S14

The magnetic properties of a pseudo-1D system were examined by ⁵⁷Fe Mössbauer spectroscopy at various temperatures for Jamesonite, Fe²⁺Pb₄Sb₆S₁₄. The spectra above 20 K are paramagnetic and those below 10 K consist of two components: (i) a complex-split spectra with a large quadrupole split and small hyperfine field as the dominant component and (ii) a sextet with a large hyperfine field and very small quadrupole split. The hyperfine parameters of the low-temperature spectra are discussed from the point of view of valence and spin state in Fe.