Abstract
The indirect energy gap and electrical resistivity of FeS2-pyrite have been measured at high pressures and 300K using optical absorption spectroscopy and electrical conductivity measurements. Absorption spectra extend to ∼28GPa, while resistivity is determined to ∼34GPa. The band gap of FeS2 is indirect throughout this pressure range and decreases linearly with pressure at a rate of −1.13(9)×10−2eV/GPa. If this linear trend continues, FeS2 is expected to metallize at a pressure of 80(±8)GPa. The logarithm of resistivity also linearly decreases with pressure to 14GPa with a slope of −0.101(±0.001)/GPa. However, between 14 and 34GPa, the logarithm of resistivity is nearly constant, with a slope of −0.011(±0.003)/GPa. The measured resistivity of pyrite may be generated predominantly by extrinsic effects.
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