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Crystals 2018, 8(5), 184;

P-T Phase Diagram of LuFe2O4

Institut Charles Gerhardt UMR CNRS 5253, Université de Montpellier, Place E Bataillon, cc1504, 34095 Montpellier CEDEX, France
Laboratoire CRISMAT, UMR 6508 CNRS, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen CEDEX, France
Laboratoire Léon Brillouin, CEA-CNRS UMR 12, 91191 Gif-sur-Yvette CEDEX, France
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble CEDEX, France
Institut Laue-Langevin, 6 rue Jules Horowitz, Boîte Postale 156, 38042 Grenoble CEDEX 9, France
Synchrotron Soleil, L’Orme des Merisiers, Saint-Aubin BP 48 91192 Gif-sur-Yvette CEDEX, France
Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, 34095 Montpellier, France
Author to whom correspondence should be addressed.
Received: 7 March 2018 / Revised: 17 April 2018 / Accepted: 20 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Non-Ambient Crystallography)
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The high-pressure behavior of LuFe2O4 is characterized based on synchrotron X-ray diffraction and neutron diffraction, resistivity measurements, X-ray absorption spectroscopy and infrared spectroscopy studies. The results obtained enabled us to propose a P-T phase diagram. In this study, the low pressure charge-ordering melting could be detected by synchrotron XRD in the P-T space. In addition to the ambient pressure monoclinic C2/m and rhombohedral R 3 ¯ m phases, the possible P 1 ¯ triclinic phase, the monoclinic high pressure form Pm and metastable modulated monoclinic phases were observed; the latter modulated monoclinic phases were not observed in the present neutron diffraction data. Furthermore, the transition to the Pm phase which was already characterized by strong kinetics is found to be favored at high temperature (373 K). Based on X-ray absorption spectroscopy data the Pm phase, which could be recovered at atmospheric pressure, can be explained by a change in the Fe-local environment from a five-fold coordination to a distorted 5 + 1 one. View Full-Text
Keywords: LuFe2O4; pressure-temperature phase diagram LuFe2O4; pressure-temperature phase diagram

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Poienar, M.; Bourgeois, J.; Martin, C.; Hervieu, M.; Damay, F.; Garbarino, G.; Hanfland, M.; Hansen, T.; Baudelet, F.; Bantignies, J.L.; Hermet, P.; Haines, J.; Rouquette, J. P-T Phase Diagram of LuFe2O4. Crystals 2018, 8, 184.

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