2. Theoretical approach to crystallization in glasses

The nature and microstructure of the crystalline phases within the glass matrix determine the specific properties of glass-ceramics. It is therefore essential to understand the crystallization phenomenon in order to be able to control the size, morphology, distribution and nature of the crystalline phases that will be formed. If crystallization takes place directly during cooling from the liquid , we speak of devitrification, an uncontrolled and therefore generally undesirable phenomenon.

The classic crystallization process comprises two...