| Popis: |
Powder compacts of a commercially-available pyrite, FeS2, have been subjected to controlled, quantitative high pressure shock loading at peak pressures from 7.5-22 GPa. The profiles of the x-ray diffraction lines have been examined to determine the reduction of the crystallite (domain) size and the introduction of residual microstrain due to defects and dislocations resulting from the transmission and interaction of the shockwave. Pyrite experience a surprisingly smaller profile broadening than observed for all other materials under similar shock conditions, suggesting a much more refractory character. Such small changes are consistent with low defect densities and with the relative low reaction activity (oxidation of sulfide to sulfate by humid air) observed on this material in complementary studies. |
