Effect of Simultaneous Nucleation and Crystal Growth on DSC Crystallization Peaks of Glasses

In this study, the change of the height of the crystallization peak, (δ T ) p , and the reciprocal of the crystallization peak temperature, 1/ T p , were investigated as a function of nucleation heat‐treatment time for two silicate glasses: (2 BaO · TiO 2 ·2 SiO 2 — B 2 TS 2 ) and lithium disilicate ( Li 2 O ·2 SiO 2 — LS 2 ). Then, monolithic pieces were heat‐treated in a differential scanning calorimetry furnace. The results demonstrated that these glasses behave similarly with respect to peak crystallization temperature, i.e., 1/ T p decreases with the heating rate for nucleation (φ n ). However, the results with B 2 TS 2 samples demonstrated that (δ T ) p increases with rising heating rates for nucleation (shorter nucleation heat treatment times), φ n , whereas (δ T ) p was found to decrease with φ n in the LS 2 specimens. This unexpected behavior is attributed to the extensive overlapping of the I ( T ) and U ( T ) curves shown by fresnoite glass.