Revisiting the phase transition of magnetite under pressure - Université de Montpellier
Article Dans Une Revue Journal of Physical Chemistry C Année : 2019

Revisiting the phase transition of magnetite under pressure

Résumé

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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Dates et versions

hal-03043057 , version 1 (07-12-2020)

Identifiants

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K. Chen, François Baudelet, Y. Mijiti, L. Nataf, A. Di Cicco, et al.. Revisiting the phase transition of magnetite under pressure. Journal of Physical Chemistry C, 2019, 123 (34), pp.21114-21119. ⟨10.1021/acs.jpcc.9b04140⟩. ⟨hal-03043057⟩
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