Magnetic susceptibility and NEXAFS spectra of Fe, Mg-codoped bismuth niobate pyrochlore

N.A. Zhuk, B.A. Makeev ORCID logo , S.V. Nekipelov, R.I. Korolev, A.A. Utkin, G.I. Chernykh show affiliations and emails
Received: 29 August 2020; Revised: 21 October 2020; Accepted: 21 October 2020
Citation: N.A. Zhuk, B.A. Makeev, S.V. Nekipelov, R.I. Korolev, A.A. Utkin, G.I. Chernykh. Magnetic susceptibility and NEXAFS spectra of Fe, Mg-codoped bismuth niobate pyrochlore. Lett. Mater., 2021, 11(1) 67-72


Iron atoms in solid solutions of magnesium-bismuth niobate have the charge state of Fe3+.Compounds with the pyrochlore structure are attracting inexhaustible interest of scientists due to the manifestation of a wide range of practically useful properties, including dielectric, photocatalytic and magnetic ones. The present work reports on the results of the study by NEXAFS spectroscopy and the static magnetic susceptibility of the electron state and the character of interatomic interactions of iron atoms in Fe-doped of multicomponent bismuth niobate pyrochlore (sp. gr. Fd-3m). Iron-containing solid solutions of the Bi2MgNb2−2xFe2xO9−δ (х ≤ 0.06) composition with the pyrochlore structure were synthesized by the solid-phase method. The lattice constant of dilute solid solutions changes insignificantly with increasing iron content and is close to the parameter of bismuth-magnesium niobate. According to X-ray spectroscopy and magnetic susceptibility data, iron atoms are distributed mainly in the octahedral positions of niobium (V) and are in the dominant amount in the Fe(III) charge state in the form of monomers and highly nuclear exchange-bound clusters with predominantly antiferromagnetic exchange. The parameters of exchange interactions in clusters and the distribution of paramagnetic iron atoms are calculated depending on the concentration of Bi2MgNb2−2xFe2xO9−δ solid solutions. The best agreement between the experimental and calculated values of the paramagnetic component of the magnetic susceptibility for Bi2MgNb2−2xFe2xO9−δ solid solutions was achieved at the following values of the antiferromagnetic exchange parameters in dimers Jdim = −25 cm−1, in trimers Jtrim = −14 cm−1 and tetramers Jtetr = −9 cm−1 and ferromagnetic exchange in dimers — Jdim = 20 cm−1, in trimers Jtrim =16 cm−1 and tetramers Jtetr =11 cm−1.

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