Abstract
KnbGeO5 (i.e., 25K2O.25Nb2O5.50GeO2) glass shows a prominent nanocrystallization, giving nanocrystals with size of approximately 30 nm. Dielectric, elastic and mechanical properties of transparent nanocrystallized KnbGeO5 glasses were examined using some techniques such as polarizability analysis, cube resonance spectra and Vickers nanoindentation. Electronic polarizability, shear modulus, bulk modulus, Young′s modulus, Debye temperature, Vickers hardness, and deformation energies during nanoindentation increase largely due to the nanocrystallization, e.g., E=64.1 GPa for the base glass and E=85.5 GPa and transparent nanocrystallized glass. The values of Poisson′s ratio and fractal bond connectivity of nanocrystallized glasses are the same as those of the base glass, suggesting that arrangements of constituent ions are almost the same in the base glass and nanocrystallized glasses. The present study suggests that nanocrystallization in glass results in not only compact atomic arrangements but also the increase in interatomic strength.
