PHYSICAL-PROPERTIES OF QUENCHED GLASSES IN THE LI2O-ZRO2-SIO2 SYSTEM

The behavior and some physical and thermal properties of a 30Li(2)O-70 SiO(2) base glass composition with addition of ZrSiO4 in the as quench ed state was investigated with the aid of X-ray diffraction (XRD), dif ferential thermal analysis (DTA), thermal expansion and microhardness measurements, as well as density measurements. Transparent glasses pre pared by the addition of ZrSiO4 up to 10.30 mol% were obtained, ZrSiO4 was found to decrease the expansion coefficient of the investigated g lasses from 11.0 x 10(-6) to 7.96 x 10(-6)degrees C-1. The glass trans ition and softening point temperatures of the glasses showed a reverse behavior. On the other hand, both hardness and density increased for successive increases of the ZrSiO4 amounts, with the highest values of 6.3 GPa and 2.65 g/cm(3), respectively.