TEMPERATURE-INITIATED STRUCTURAL CHANGES IN FeS2 PYRITE FROM POHORJE, EASTERN ALPS, NORTH-EASTERN SLOVENIA

摘要

X-ray phase analysis (XRD), differential thermal analysis (DTA) and X-ray fluorescence spectroscopy (XRF) of pyrite samples in a protective (Ar) and an oxidative atmosphere (air) at different temperatures (200, 300, 500, 700) degrees C and times (1, 2, 4) h were made. A graphical representation of the unit cell of magnetic pyrrhotite and diffraction patterns of the individual crystal structures of pyrite, which occur in the sample at selected temperatures, atmosphere, and exposure times were analyzed with X-ray diffraction software (CrystalMaker). The results show that FeS2 exhibited temperature-dependent changes in the crystal structure that are not included in current Fe-S phase diagrams.