FeWO 4 Single Crystals: Structure, Oxidation States, and Magnetic and Transport Properties - Archive ouverte HAL
Article Dans Une Revue Chemistry of Materials Année : 2022

FeWO 4 Single Crystals: Structure, Oxidation States, and Magnetic and Transport Properties

Résumé

Synthetic crystals of the ferberite FeWO 4 have been grown by the chemical transport reaction starting from a polycrystalline sample of this phase. Magnetic susceptibility measurements showed an antiferromagnetic Neél temperature of T N = 75 K. The anisotropy in the magnetic susceptibility can be ascribed to the magnetocrystalline anisotropy of the Fe 2+ ion, the oxidation state of which was confirmed by X-ray absorption spectroscopy. While X-ray photoemission analysis indicated that all W ions are in the expected 6+ charge state, the dielectric permittivity of the FeWO 4 crystals was found to be leaky, hindering changes at T N to be detected. Subsequent thermoelectric power measurements suggested the presence of about 1.5% Fe 3+. X-ray diffraction experiments confirmed the basic crystal structure of the wolframite type and revealed some structural disorder in the 1% range. Transmission electron microscopy allowed us to unveil the occurrence of stacking faults attributed to the similarity of the atomic environment of the Fe and W species.

Domaines

Matériaux
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Dates et versions

hal-03822238 , version 1 (20-10-2022)

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Antoine Maignan, Marcus Schmidt, Yurii Prots, Oleg I Lebedev, Ramzy Daou, et al.. FeWO 4 Single Crystals: Structure, Oxidation States, and Magnetic and Transport Properties. Chemistry of Materials, 2022, 34 (2), pp.789-797. ⟨10.1021/acs.chemmater.1c03640⟩. ⟨hal-03822238⟩
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