期刊
AMERICAN MINERALOGIST
卷 97, 期 10, 页码 1808-1811出版社
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2012.4270
关键词
Fe4O5; magnetite; phase transformation; high pressure
资金
- Deutsche Forschungsgemeinschaft [1236, Wo 652/9-1, FR 1555/4]
- ERC through the EU 7th Framework Programme [227893]
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 (Fe3O4). Refinement of diffraction patterns reveals that magnetite breaks down via a disproportionation reaction to Fe4O5 and hematite (Fe2O3) 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 similar to 973-1673 K, and (2) these two phases should recombine at yet higher pressures to produce an h-Fe3O4 phase. Keywords: Fe4O3, magnetite, phase transformation, high pressure
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