Theory of Low-Frequency Scattering of Light by Superionic Glasses with Nanosize Structure

In the Raman spectra of glasses of (AgI) _x (Ag₂O · nB₂O₃)_{1 – x} type, along with so-called boson peak (at frequencies of about 10 cm^–1), a wide central component is pronounced even at room temperature. The component is similar to that in the spectra of crystalline superionic -AgI. The emergence of such a central component in the spectra for glasses containing AgI indicates that size effects, which are associated with the glass structure, can significantly modify the relaxation modes associated with ionic conduction. For the first time, low-frequency spectra of superionic glasses are theoretically analyzed taking into account that, in nanocrystalline AgI, the mobile ion concentration is increased. A theoretical treatment of experimental spectra can provide information on important physicochemical characteristics of such glasses.