Study of Bismuth-Containing Composites Based on Thermally Modified Porous Glass with Low Additions of P2O5 and Fluorine Ions by the Near Infrared Spectroscopy Method
Bismuth-containing composite materials are synthesized by the impregnation of matrices of thermally modified porous glass in 0.5 M water solutions of bismuth nitrate followed by the heat treatment of the bismuth-containing composite material in a wide temperature range of 50 to 870°C. The samples which differ by the regime of the thermal modification of porous glass (PG) (120, 400, and 600°C, duration 1 or 2 h) and the temperature of the heat treatment are studied by the near infrared spectroscopy. Dehydroxylation and glass surface concentration with impurity boron atoms occur with the growth of the heat treatment temperature. Bands caused by the absorption of Bi+ ions, bismuth active centers associated with silicon, and Bi4 and Bi3 bismuth dimers are found.
Keywords:bismuth-containing composite materials porous glass near infrared spectroscopy
The authors thank the members of the laboratory of the Physical Chemistry of Glass, Institute of Silicate Chemistry, Russian Academy of Sciences L.N. Kurilenko, T.G. Kostyreva, L.F. Dikaya, L.A. Doronina, and E.A. Semenova for conducting the chemical analysis of the samples.
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 SP-1914.2018.1).
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