2O–CaO–B 2O 3 system]]>

摘要

Glasses in the ternary xLi2O + (33-x)CaO?+?67B2O3tetraborate system, with x?=?0, 5, 10, 15, 20, 25, 30 and 33?mol%, were prepared by melting and casting. The glass structure, and thermal, and electrical response of highly transparent and homogeneous glasses were evaluated by X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), Fourier Transform Infrared Spectroscopy (FTIR) and Impedance Spectroscopy (IS). The glass transition temperature (Tg) decreases as CaO is substituted by Li2O (increasing x), while the thermal stability against crystallization to the supercooled liquid in the region Tg?