S. A. Kirillova
I.V. Grebenshchikov Institute of Silicate Chemistry of RAS; St. Petersburg Electrotechnical University “LETI”
Russian Federation

Emb. Makarova, 2, St. Petersburg, 199034;

Professor Popov St., 5, St. Petersburg, 197376.

V. I. Almjashev
I.V. Grebenshchikov Institute of Silicate Chemistry of RAS; St. Petersburg Electrotechnical University “LETI”; FSUE “Alexandrov Research Institute of Technology”
Russian Federation

Emb. Makarova, 2, St. Petersburg, 199034;

Professor Popov St., 5, St. Petersburg, 197376;

Koporskoye sh., 72, Sosnovy Bor LR, 188540.

V. L. Stolyarova
I.V. Grebenshchikov Institute of Silicate Chemistry of RAS; St. Petersburg State University
Russian Federation

Emb. Makarova, 2, St. Petersburg, 199034;

Universitetskaya nab., 7/9, St. Petersburg, 199034.