Vibrational spectra and polariton dispersion of pure and $\mathrm{Al}$ and $\mathrm{Cr}$ doped $\mathrm{Bi}_{12}\mathrm{SiO}_{20}$ crystals

V. N. Moiseenko, B. Orel, M. Klainshek, T. V. Panchenko

Dnepropetrovsk State University

UDC: 535.33

Received: 10.05.1984

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