EPR Spectra and Distribution of Manganese Ions in Modified Fluorozirconate Glasses

— We have studied EPR spectra of MnO 2 -activated fluorozirconate and fluorohafnate glasses in order to determine the oxidation state and distribution of the manganese ions. The effect of activator concentration on the ratio of the percentage of free Mn 4+ ions to that of ions in clusters in the gla...

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Bibliographic Details
Published in:Inorganic materials 2019-07, Vol.55 (7), p.710-714
Main Authors: Brekhovskikh, M. N., Solodovnikov, S. P., Moiseeva, L. V., Zhidkova, I. A., Denisov, G. L., Fedorov, V. A.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Clusters
Devitrification
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Manganese dioxide
Manganese ions
Materials Science
Oxidation
Valence
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Summary:— We have studied EPR spectra of MnO 2 -activated fluorozirconate and fluorohafnate glasses in order to determine the oxidation state and distribution of the manganese ions. The effect of activator concentration on the ratio of the percentage of free Mn 4+ ions to that of ions in clusters in the glasses has been investigated for the first time. The results demonstrate that, at high activator concentrations, the manganese ions in the glasses are clustered, and only a small fraction of them are present as isolated ions. Reducing the manganese concentration leads to an increase in the percentage of free Mn 4+ ions. Devitrification is accompanied by dissociation of the clusters and a transition of the ions to an isolated state.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168519070045