Fig. 4

Separation of different types of glasses. a Heating curves measured at 20,000 K s⁻¹ for differently cooled samples between 20 and 400 K s⁻¹ (black) and 500 and 20,000 K s⁻¹ (red). b Heating curves measured at 6000 K s⁻¹ for differently cooled samples between 10 and 40,000 K s⁻¹. This measurement procedure enables us to distinguish four different classes of materials according to the crystallization and melting events