Abstract
The crystallization of the xK2O · xNb2O5· (1 – 2x)SiO2(x= 0.167–0.250) glasses and glasses close in composition to K2O · Nb2O5· 4SiO2at the ratio K2O : Nb2O5≠ 1 is investigated. In high-silica glasses, the metastable phase separation followed by the bulk multiphase crystallization are observed at temperatures close to the glass transition point Tg. The nanostructured transparent glasses that exhibit the optical second harmonic generation (SHG) effect are formed at the early stages of phase separation. The surface crystallization of glasses with the precipitation of the KNbSi2O7noncentrosymmetric phase occurs at higher temperatures.
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