Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure

Abstract

The pressure evolution of the local structure of Fe2O3 hematite has been determined for the first time by extended x-ray absorption fine structure up to 79 GPa. The comparison to the different high-pressure forms proposed in the literature suggests that the orthorhombic structure with space group Aba2 is the most probable. The crossover from Fe high-spin to low-spin states with pressure increase has been monitored from the pre-edge region of the Fe K-edge absorption spectra. The "simultaneous" comparison with the local structural changes allows us to definitively conclude that it is the electronic transition that drives the structural transition and not viceversa.

References in corpus (2)

• Pressure-Driven Metal-Insulator Transition in Hematite from Dynamical Mean-Field Theory
• High pressure evolution of Fe${}_2$O${}_3$ electronic structure revealed by X-ray absorption

Cited by in corpus (6)

• Theoretical and experimental evidence of a site-selective Mott transition in Fe2O3 under pressure
• Local Electronic Structure and Dynamics of Muon-Polaron Complexes in Fe${}_2$O${}_3$
• Shock-driven amorphization and melt in Fe${}_2$O${}_3$
• Charge disproportionation and site-selective local magnetic moments in the post-perovskite-type Fe${}_2$O${}_3$ under ultra-high pressures
• Phase transitions of Fe${}_2$O${}_3$ under laser shock compression
• Electronic-Entropy-Driven Phase Transitions in Compressed Iron Oxides