Spectroscopy of condensed matter

Study of vibrational spectra and thermal behavior of sodium fluorocirconate Na$_5$Zr$_2$F$_{13}$

N. A. Didenko, E. I. Voit

Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, 690022 Vladivostok, Russia

Abstract: The structure and thermal stability of the compound Na$_5$Zr$_2$F$_{13}$ in the range of temperatures 20–800$^\circ$C was studied by differential thermal and thermogravimetric analysis (DTA-TGA), X-ray diffraction analysis (XRDA) and vibrational spectroscopy.The phase transition to the high-temperature modification $\alpha$-Na$_5$Zr$_2$F$_{13}$ with dynamically disordered structure was confirmed. Infrared (IR) spectroscopy and Raman scattering (RS) spectroscopy data of the compound $\beta$-Na$_5$Zr$_2$F$_{13}$ and its decomposition products upon heating were obtained, systematized and generalized. Based on the results of quantum-chemical calculations, the bands in the vibrational spectra of Na$_5$Zr$_2$F$_{13}$.

Keywords: complex zirconium fluorides, sodium fluorocirconates, thermogravimetry, vibrational spectroscopy.

Received: 27.12.2022
Revised: 27.02.2023
Accepted: 28.02.2023

DOI: 10.21883/OS.2023.03.55385.4492-22

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