Determination of molybdenum oxidation state on the mechanochemically treated MoO 3

N. S. Kopachevska; A. K. Melnyk; I. V. Bacherikova; V. A. Zazhigalov; K. Wieczorek-Ciurowa

doi:10.15407/hftp06.04.474

Determination of molybdenum oxidation state on the mechanochemically treated MoO₃

DOI: https://doi.org/10.15407/hftp06.04.474

N. S. Kopachevska, A. K. Melnyk, I. V. Bacherikova, V. A. Zazhigalov, K. Wieczorek-Ciurowa

Abstract

The molybdenum oxidation degree in the MoO₃samples after mechanochemical treatment in various media (air, water, ethanol) has been studied by titration, EPR and XANES methods. It has been shown that molybdenum reduction proceeds in all the media used and its degree is determined by powder loading (rotation speed and time treatment) and medium nature. The XANES spectra demonstrate that MoO₃ reduction leads to Mo⁵⁺ ions formation only. The maximal reduction degree is observed at treatment in ethanol. Existence of charged oxygen species located within Mo⁵⁺ environment was also shown.

Keywords

mechanochemical treatment; oxidation degree; MoO3; EPR spectra

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