Abstract
Structural phase transitions of iron oxide (Fe 2O 3) have been investigated at pressures up to 70 GPa and temperatures above 2500 K, using a laser-heated diamond anvil cell technique. A phase transition between α-Fe 2O 3 (hematite) and perovskite-type Fe 2O 3 was observed at about 30 GPa. At pressures higher than 50 GPa, we also observed the occurrence of a new high-pressure phase of Fe 2O 3. Diffraction peaks of the new high-pressure phase can be indexed on the basis of orthorhombic or monoclinic symmetries that are denser than other known Fe 2O 3 phases. The volume change from perovskite-type to the new high-pressure phase is about 7%.
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