Crystalline Structure And Magnetic Properties Of Pyrite Fes2

Iron pyrite (FeS2) has attracted significant attention as a promising inorganic material in various applications, such as electrode materials for high-energy batteries, medical diagnostics, semiconductor materials, and photovoltaic solar cells. In this study, we characterized the crystalline structure and magnetic properties of FeS2 using X-ray diffraction (XRD), vibrating sample magnetometry, and Mossbauer spectroscopy. The refined XRD patterns confirmed that the crystalline structure of FeS2 was cubic (Pa-3 space group) with lattice constant a(0) = 5.417 angstrom. The temperature dependence of the zero-field-cooled and field-cooled curves and the hysteresis loops were measured at various temperatures between 4.2 and 295 K. The Mossbauer spectra collected in the temperature range of 4.2-500 K were fitted with one doublet. The Delta E-Q values increased slightly with decreasing temperature owing to changes in the Fe-S distance. The charge state was determined to be Fe2+ based on the isomer shift (delta).