Abstract—
Bismuth-containing composite materials are synthesized by the impregnation of matrices of thermally modified porous glass (PG) in 0.5 M aqueous solutions of bismuth nitrate followed by heat treatment. The optical density spectra of the obtained materials are studied depending on the heat treatment temperature (400–870°C). When the temperature of the heat treatment is increased, the distribution of bismuth in the samples becomes more homogeneous. The heat treatment in the range of 650 to 870°C leads to the degree of bismuth oxidation changing from Bi3+ to Bi2+ ions with the formation of dimers and clusters of bismuth.
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ACKNOWLEDGMENTS
The authors thank T.G. Kostyreva, E.A. Semenova, and L.A. Doronina (Laboratory of Physical Chemistry of Glass, Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences) for the chemical analysis of the samples and A.V. Antonov (researcher, Karpinsky Russian Geological Research Institute, St. Petersburg) for the investigation of the bismuth-containing composites by the EDX method. The data obtained by the BET method were provided by T.V. Antropova.
Funding
The work was carried out with the financial support of the scholarship of the President of the Russian Federation to young scientists and postgraduate students (project no. SP-1914.2018.1). The samples of two-phase glass were obtained as part of a state assignment of the Institute of Silicate Chemistry, Russian Academy of Sciences under the Program of Fundamental Scientific Research of the State Academies of Sciences for 2013–2020.
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Translated by N. Saetova
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Girsova, M.A., Anfimova, I.N., Kurilenko, L.N. et al. Influence of Heat-Treatment Conditions on the Optical Properties of Bismuth-Containing Composites Based on High-Silica Porous Glass. Glass Phys Chem 45, 592–595 (2019). https://doi.org/10.1134/S1087659619060063
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DOI: https://doi.org/10.1134/S1087659619060063