Crystallization and nonlinear optical properties of potassium niobium silicate glassesстатья
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Аннотация:The crystallization of the xK(2)O (.) xNb(2)O(5) (.) (1 - 2x)SiO2 (x = 0.167-0.250) glasses and glasses close in composition to K2O (.) Nb2O5 (.) 4SiO(2) at the ratio K2O : Nb2O5 not equal 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 T-g. 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 KNbSi2O7 noncentrosymmetric phase occurs at higher temperatures.