Crystallization kinetics of basalt glass

The crystallization behaviour of basalt glass at elevated temperatures was studied using glass samples prepared by melting the natural basalt rock from the Thrace region of Turkiye. DTA and XRD analysis revealed the crystallization of augite [(Ca Fe Mg) SiO3 at 800 degrees C. The kinetics of crystallization of augite were studied by applying the DTA measurements carried out at different heating rates and the activation energies of crystallization and viscous flow were measured as 238 kJ mol(-1) and 413 kJ mol(-1), respectively. The resultant basalt glass-ceramic revealed very fine and homogeneous microstructure. (C) 1995 Elsevier Science Limited and Techna S.r.l.