In situ study of the crystallization mechanism in LiNbO3- SiO2 glassesстатьяИсследовательская статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 16 ноября 2017 г.
Аннотация:A crystallization study of lithium niobium silicate glass with the molar composition 35Li2O.25Nb2O5.40SiO2 is reported using in situ techniques (x-ray diffraction, Raman spectroscopy and environmental electron microscopy) at high temperatures. Those techniques reveal that the surface crystallization begins at Tg with c-axis crystallites oriented perpendicular to the surface. Precipitation of nuclei, followed by growth and coalescence processes, induce the formation of particles and spherulites 0-5-4 μm diameter in size. A strong difference between surface and bulk crystallization has been observed with bulk crystallization yielding to 30 [im diameter size spherulites. Those original spherulite shapes could be the origin of the macroscopic bulk second harmonic generation (SHG) signal.