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Fluorination of Bi1.8Fe1.2SbO7 pyrochlore solid solutions

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Inorganic Materials Aims and scope

Abstract

A technique has been developed for fluorinating the pyrochlore oxide Bi1.8Fe0.2FeSbO7, and a compound with the composition Bi1.8Fe1.2SbO7–x/2Fx has been obtained. The synthesized oxyfluoride also has the pyrochlore structure (sp. gr. Fd3m), with a lattice parameter a = 10.4443(1) Å (R wp = 5.2). It has been shown that the charge balance upon fluorine substitution for oxygen is maintained not through partial reduction of Fe3+ to Fe2+ but through the incorporation of fluorine into oxygen vacancies. The magnetic behavior of the fluorinated pyrochlore phase is determined by the persisting frustration of the octahedral sublattice, which is responsible for the development of a spin glass state below T f = 12 K. The fluorination-induced changes in the anion sublattice led to an increase in the antiferromagnetic exchange interaction between neighboring Fe3+ ions and changes in the dynamic properties of the spin glass phase.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    A. V. Egorysheva, O. G. Ellert, O. M. Gaitko, M. N. Brekhovskikh & I. A. Zhidkova

  2. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    Yu. V. Maksimov

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  1. A. V. Egorysheva
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  2. O. G. Ellert
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Correspondence to A. V. Egorysheva.

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Original Russian Text © A.V. Egorysheva, O.G. Ellert, O.M. Gaitko, M.N. Brekhovskikh, I.A. Zhidkova, Yu.V. Maksimov, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 9, pp. 982–988.

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Egorysheva, A.V., Ellert, O.G., Gaitko, O.M. et al. Fluorination of Bi1.8Fe1.2SbO7 pyrochlore solid solutions. Inorg Mater 53, 962–968 (2017). https://doi.org/10.1134/S0020168517090072

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  • DOI: https://doi.org/10.1134/S0020168517090072

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