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Relation between Structural and Magnetic Properties of Nb0.94Fe1.06O3.76F0.24

✍ Scribed by F. Bayi; G. Pourroy; P. Poix

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 175 KB
Volume: 107
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1993.1342

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✦ Synopsis

The oxyfluoride phases (x \mathrm{NbFeO}{4}-(1-x) \mathrm{FeF}{2}) have been synthesized. They exist in a limited range (0.8<x<1). They are isomorphous with (\mathrm{NbFeO}{4}), having the wolframite structure. The refinement of the crystallographic structure of the oxyfluoride phase (\mathrm{Nb}{0.94} \mathrm{Fe}{1.06} \mathrm{O}{3.76} \mathrm{~F}_{0.24}) 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 \mathrm{~K}). Mössbauer measurements show that the valence is localized. 1993 Academic Press, Inc.

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