AMINE INTERCALATION IN FEPS3 - A FE-57 MOSSBAUER STUDY

The methylamine and ethylamine intercalates of FePS3 were prepared, ch aracterized by x-ray diffraction (XRD) and investigated by Fe-57 Mossb auer spectroscopy. The XRD results show that the intercalate remains m onoclinic but exhibits a fairly large expansion of its c axis. The ori ginal Mossbauer line of the host FePS3 is absent in all the compounds. The Mossbauer spectra consist of lines originating from modified host lattice and two types of reduced sites created due to transfer of ele ctrons during intercalation. The origin of the observation of two kind s of reduced sites has been suggested. Mossbauer results highlight tha t beyond a certain concentration of guest species the transferred elec trons in the amine intercalates are primarily of delocalized character whereas it is of localized nature in the case of Li intercalated FePS 3.