Synchrotron X-ray Study of Iron at High Pressure and Temperature

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Science  22 Sep 1995:
Vol. 269, Issue 5231, pp. 1703-1704
DOI: 10.1126/science.269.5231.1703


X-ray synchrotron experiments with in situ laser heating of iron in a diamond-anvil cell show that the high-pressure ε phase, a hexagonal close-packed (hcp) structure, transforms to another phase (possibly a polytype double-layer hcp) at a pressure of about 38 gigapascals and at temperatures between 1200 and 1500 kelvin. This information has implications for the phase relations of iron in Earth's core.