NEXAFS and FTIR spectroscopy of Co-doped SrBi$_2$Nb$_2$O$_9$

Nadezhda A. Zhuk^a, Elena U. Ipatova^b, Boris A. Makeev^c, Sergey V. Nekipelov^d, Dmitriy S. Beznosikov^e, Lubov V. Rychkova<sup>a

a</sup> Pitirim Sorokin Syktyvkar State University, Syktyvkar, Russian Federation
^b Institute of Chemistry of the Komi Scientific Center Ural Branch RAS, Syktyvkar, Russian Federation
^c Institute of Geology of the Komi Scientific Center Ural Branch RAS, Syktyvkar, Russian Federation
^d Institute of Physics and Mathematics of the Komi Science Center UB RAS, Syktyvkar, Russian Federation
^e Federal State Unitary Enterprise «General Radio Frequency Centre» Syktyvkar, Russian Federation

Abstract: The solid-phase ceramic method was used to synthesize cobalt-containing solid solutions based on SrBi$_2$Nb$_2$O$_9$. NEXAFS (Near Edge X-ray Absorption Fine Structure) and IR spectroscopy were used to study the electronic state of cobalt atoms in solid cross-links with a layered perovskite-like structure. It was found that cobalt atoms are in high-spin states of Co(III) and, mainly, Co(II) in an octahedral oxygen environment.

Keywords: Aurivillius phases, IR spectroscopy, NEXAFS, cobalt.

UDC: 541.122: 538.214

Received: 26.04.2021
Received in revised form: 20.08.2021
Accepted: 22.10.2021

Language: English

DOI: 10.17516/1997-1397-2022-15-1-5-12

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