A High-Pressure Polymorph of Troilite, FeS

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Science  20 Nov 1970:
Vol. 170, Issue 3960, pp. 850-851
DOI: 10.1126/science.170.3960.850


A new polymorph of FeS was produced in a diamond-anvil cell and observed at high pressure both optically and by x-ray diffraction. Fourteen x-ray reflections of the high-pressure FeS were recorded; however, the crystal structure is unknown. This form of FeS is stable at 25°C only at pressures above approximately 55 kilobars. The transition to the lower pressure polymorph, troilite, is rapid and reversible.

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