Geodesic
Magnetic behavior and nexafs-spectroscopy of Bi$_2$BaNb$_{2-2x}$Сo$_{2x}$O$_{9-\delta}$
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 12 (2019) no. 6, pp. 687-693.

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The samples of solid solutions of Bi$_2$BaNb$_{2-2x}$Сo$_{2x}$O$_{9-\delta}$ composition at $x \leqslant 0.04$ were synthesized by the solid-phase method. The electron state and the nature of the exchange interactions of cobalt atoms in the samples were studied by the measurements of magnetic susceptibility and NEXAFS-spectroscopy. The NEXAFS spectra of the solid solutions and the cobalt oxides CoO, Co$_3$O$_4$ were recorded. According to the data of X-ray spectroscopy and magnetic susceptibility, the charge states of cobalt atoms in the solid solutions were identified as Co(II) and Co(III) in the forms of monomers and exchange-bound aggregates with the antiferromagnetic type of exchange.
Keywords: cobalt, clusters, exchange interactions, NEXAFS-spectroscopy. 
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     author = {Lubov V. Rychkova and Sergey V. Nekipelov and Boris A. Makeev and Vladimir A. Belyy and Dmitriy S. Beznosikov and Nadezhda A. Zhuk},
     title = {Magnetic behavior and nexafs-spectroscopy of {Bi}$_2${BaNb}$_{2-2x}${{\CYRS}o}$_{2x}${O}$_{9-\delta}$},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
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     volume = {12},
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Lubov V. Rychkova; Sergey V. Nekipelov; Boris A. Makeev; Vladimir A. Belyy; Dmitriy S. Beznosikov; Nadezhda A. Zhuk. Magnetic behavior and nexafs-spectroscopy of Bi$_2$BaNb$_{2-2x}$Сo$_{2x}$O$_{9-\delta}$. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 12 (2019) no. 6, pp. 687-693. http://geodesic.mathdoc.fr/item/JSFU_2019_12_6_a3/

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