Abstract
Two new phases Th 4Fe 13Sn 5 and ThFe 0.22Sn 2 have been studied by 57Fe and 119Sn Mössbauer spectroscopy. The 57Fe Mössbauer spectra of Th 4Fe 13Sn 5, measured at room temperature and 4.2 K without and with applied magnetic field up to 5.5 T, exhibit four sextets. Our measurements prove that all four Fe sub-lattices are collinear. The 119Sn Mössbauer spectra of Th 4Fe 13Sn 5 show two sextets with different B eff, reflecting the influence of ferromagnetic nn iron atoms. The results obtained from full-potential linear augmented plane wave (LAPW) calculations are in agreement with the experimental data and confirm the assignment of Mössbauer spectra. The Mössbauer data for the ThFe 0.22Sn compound prove the existence of two different sites both for Fe and Sn, all having icosahedral co-ordination.
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