Unveiling pressure-induced anomalous shear behavior and thermoelasticity of α-Fe₂O₃ hematite at high pressure.

ABSTRACT: Hematite (α-Fe₂O₃), as an important end-member of FeO-Fe₂O₃ series, has garnered particular interest for its peculiar high pressure-temperature (P-T) behavior, structural stability and elasticity, and the unclear role of Fe³⁺ in the nature and dynamics of the Earth's mantle. Here, we report a pronounced pressure-induced anomaly in the shear behavior of hematite at room temperature and ∼3.5 GPa owing to the (weak)ferromagnetic-to-antiferromagnetic Morin transition driven by pressure and temperature. Unexpectedly, this phase-transition-driven anomalous behavior at high P-T is absent in the compressional velocities. The bulk and shear moduli, as well as their pressure and temperature dependences for Fe₂O

SUBMITTER: Zou Y 

PROVIDER: S-EPMC11848791 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature