Borate is one of the chemically powerful glass modelling oxides and when alkali oxides are added such as zinc, lithium, and aluminium to amorphous boron oxide, its characteristics such as covalent network are remarkably affected causing the formation of ionic sites which embed the changing alkali ...
It is widely known that the bond between alkaline atom and oxygen is ionic bond which is in general weaker than the covalent bond. Hence, in the present study, Tg decreases with the increase in Li2O content. This result is supported by the density measurements, where the molar volume ...