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Revisiting the Phase Transition of Magnetite under Pressure

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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Agrestini,  S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chen, K., Baudelet, F., Mijiti, Y., Nataf, L., Di Cicco, A., Hu, Z., et al. (2019). Revisiting the Phase Transition of Magnetite under Pressure. The Journal of Physical Chemistry C, 123, 21114-21119. doi:10.1021/acs.jpcc.9b04140.


Cite as: http://hdl.handle.net/21.11116/0000-0004-BDDF-D
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. © 2019 American Chemical Society.