Quadrupole Interaction in Fe(NH₄SO₄)₂ 6H₂O Diluted with Cu²⁺ Ions

Abstract

The room temperature Mössbauer studies in ferrous ammonium sulphate hexahydrate (FAS) diluted with different concentrations of Cu 2+ ions are reported. Two nonequivalent sites for Fe 2+ ions are proposed. The quadrupole splitting and isomer-shifts obtained in various spectra are qualitatively explained on the basis of Ingalls and Oosterhuis theoretical models. From the observed spectra the values of axial field splittings are found and the effective magnetic susceptibility is calculated and compared with the experimantal one.