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Crystallization and Nonlinear Optical Properties of Potassium Niobium Silicate Glasses |
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| Authors: | V N Sigaev P D Sarkisov M V Kupriyanova Yu A Spiridonov E V Lopatina S Yu Stefanovich V I Molev P Pernice A Aronne |
| Affiliation: | (1) Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125190, Russia;(2) Karpov Research Institute of Physical Chemistry (Russian State Scientific Center), ul. Vorontsovo pole 10, Moscow, 103064, Russia;(3) AOOT Lytkarinskii Zavod Opticheskogo Stekla, Lytkarino, Moscow oblast, 140061, Russia;(4) Department of Materials and Production Engineering, University of Naples  Federico II,  P.le Tecchio, 80125 Naples, Italy |
| 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 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 KNbSi2O7noncentrosymmetric phase occurs at higher temperatures. |
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