were evaluated through usual Vickers indentation and nanoindentation tests. The glass
transition temperature (Tg D295–421±C), Vickers hardness (Hv D2:9–4.5 GPa), true hardness
(H D1:5–3.8 GPa) and Young’s modulus (E D24:4–72.6 GPa) decreased monotonously with
increasing Bi2O3 content. This compositional trend demonstrates that the strength of Bi¡O
chemical bonds in these glasses is considerably weak compared with B¡O bonds and
plastic deformations under indentation loading occur easily. The elastic recovery after
unloading was about 45% for the glasses with x D20–50, and the Poisson’s ratio was 0.27
for the glass with x D20. The fracture toughness was evaluated to be 0.37–0.88 MPam1=2
from the values of Hv and E, and it was proposed that not only weak Bi¡O bonds but also
boron coordination polyhedra (BO3 or BO4) and their arrangements affect on crack
formation. From the temperature dependence of Vickers hardness up to the glass transition
region, it was suggested that the glasses with high Bi2O3 contents belong to the category to
fragile glass-forming liquids. C ° 2001 Kluwer Academic Publishers