Inelastic light scattering from nanocrystallizing niobiotellurite glass: an insight into the metastable phase and phase-transformation dynamics

In situ observations of inelastic light scattering of Raman and Boson regions were performed in nanocrystallized 15K2O–15Nb2O5–70TeO2 glass to investigate nanocrystallization dynamics during the heating process. These in situ observations revealed a drastic structural rearrangement during the evolution of metastable K[Nb1/3Te2/3]2O4.8 nanocrystals. It is suggested that the distortion of the octahedral NbO6 unit being released in the glassy phase is the key to nanocrystallization.