Revisiting the Phase Transition of Magnetite under Pressure

Abstract : Using a highly stoichiometric magnetite, the pressure-induced phase transitions of Fe3O4 have been revisited here by performing Fe K-edge X-ray absorption and magnetic circular dichroism measurements up to P = 65 GPa at room temperature and 71 GPa at 20 K. We have observed a structural transition at around 27 GPa from magnetite to a high-pressure phase h-Fe3O4 with the loss of the net ordered magnetic moments for both temperatures. The orthorhombic CaTi2O4-type (Bbmm) structure of the high-pressure phase h-Fe3O4 has been determined by combining experimental studies and theoretical simulations of the Fe K-edge X-ray absorption near-edge structure spectra. The long-time discussed pressure induced spin crossover, and inverse to normal spinel structure transitions in Fe3O4 can be deterministically excluded from the present study up to ∼65 GPa.
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https://hal.umontpellier.fr/hal-02296250
Contributeur : Odile Hennaut <>
Soumis le : mercredi 25 septembre 2019 - 08:45:41
Dernière modification le : jeudi 26 septembre 2019 - 01:19:28

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K. Chen, F. Baudelet, Y. Mijiti, L. Nataf, A. Di Cicco, et al.. Revisiting the Phase Transition of Magnetite under Pressure. Journal of Physical Chemistry C, American Chemical Society, 2019, 123 (34), pp.21114-21119. ⟨10.1021/acs.jpcc.9b04140⟩. ⟨hal-02296250⟩

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