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Nature of the High-Pressure Transition in Fe2O3 Hematite

Abstract : We present a new method to separate the crystallographic and electronic phase transitions in hematite using x-ray emission spectroscopy and x-ray diffraction. Our observations, based on the behavior of a metastable high-pressure phase in the stability domain of the low-pressure phase, show that the electronic transition is preempted by the crystallographic transition. The former occurs only afterwards in the high-pressure phase, possibly as a result of a Mott transition. The idea that the electronic transition drives the transition in hematite is therefore invalidated. Such methods should help elucidate the mechanics and the driving forces behind a number of first-order high-pressure phase transitions.
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James Badro, Guillaume Fiquet, Viktor Struzhkin, Maddury Somayazulu, Ho-Kwang Mao, et al.. Nature of the High-Pressure Transition in Fe2O3 Hematite. Physical Review Letters, American Physical Society, 2002, 89 (20), pp.205504. ⟨10.1103/PhysRevLett.89.205504⟩. ⟨insu-01387452⟩

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