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The pressure evolution of the local structure of Fe2O3 hematite has beendetermined for the first time by extended x-ray absorption fine structure up to79 GPa. The comparison to the different high-pressure forms proposed in theliterature suggests that the orthorhombic structure with space group Aba2 isthe most probable. The crossover from Fe high-spin to low-spin states withpressure increase has been monitored from the pre-edge region of the Fe K-edgeabsorption spectra. The "simultaneous" comparison with the local structuralchanges allows us to definitively conclude that it is the electronic transitionthat drives the structural transition and not viceversa.

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