Abstract

The oxyfluoride phases xNbFeO4-(1 - x )FeF2 have been synthesized. They exist in a limited range 0.8 < x < 1. They are isomorphous with NbFeO4, having the wolframite structure. The refinement of the crystallographic structure of the oxyfluoride phase Nb0.94Fe1.06O3.76F0.24 using a Rietveld method has pointed out a partial cationic disorder between niobium and iron. The consequence of incomplete order is a field-dependent magnetic susceptibility at low temperatures. Ac susceptibility measurements versus temperature exhibit a maximum at 35 K. Mössbauer measurements show that the valence is localized.

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