FLUX GROWTH AND ELECTRICAL-TRANSPORT MEASUREMENTS OF PYRITE (FES2)

Pyrite (FeS2) has been synthesized by the direct reaction of iron with sulfur in liquid sodium polysulfide. A high pressure reflux technique has been used for controlling the vapour pressure of sulfur during th e synthesis reaction. FeS2 Crystals have been grown from sodium polysu lfide fluxes. As-grown crystals showed n-type conduction with an elect ron concentration of 3 X 10(16) cm-3 and a Hall mobility of 100 cm2/V. s at room temperature. The mobility was limited by ionized impurity sc attering and the carrier concentration was thermally activated with E( n) = 81 meV.