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In situ synchrotron X-ray powder diffraction measurements using a Paris-Edinburgh pressure cell were performed to investigate the nature of the high-pressure breakdown reaction of magnetite (Fe 3 O 4 ). Refinement of diffraction patterns reveals that magnetite breaks down via a disproportionation reaction to Fe 4 O 5  and hematite (Fe 2 O 3 ) rather than undergoing an isochemical phase transition. This result, combined with literature data indicates (1) that this reaction occurs at ~9.5-11 GPa and 973-1673 K, and (2) these two phases should recombine at yet higher pressures to produce an h-Fe 3 O 4  phase.

Letter. In situ observation of the breakdown of magnetite (Fe 3 O 4 ) to Fe 4 O 5 and hematite at high pressures and temperatures