Mechanical characterization of optical glasses and glass-ceramics by nanoindentation technique

Abstract

Mechanical properties of glasses in the system Sm₂O₃-Bi₂O₃-B₂O₃ and transparent TeO₂-based glasses and glass-ceramics (15K₂O.15Nb₂O₅.68TeO₂.2MoO₃) consisting of nanocrystalline particles and showing optical second harmonic generation were evaluated by means of nanoindentation test following the ISO14577. The Sm₂O₃-Bi₂O₃-B₂O₃ glass has a Martens hardness that fluctuates between 4.57 GPa and 6.61GPa in function of applied load and has an Indentation hardness that fluctuates between 6.95 GPa and 13.15 GPa. The transparent TeO₂-based glass-ceramic heat-treated at 410°C show an Elastic modulus (E) that fluctuates between 56.1 GPa and 92.1GPa. The values of Poisson ratio (v) and Elastic modulus were also estimated by means of cube resonance method, showing v = 0.22 and E = 69.68 GPa in the case of transparent TeO₂-based glass-ceramic heat-treated at 410°C.