Abstract
In micaceous glasses cabbage-shaped mica crystal aggregates are formed at certain compositions and distinct heat-treatment schedules. It is experimentally proved that a liquid–liquid phase separation is responsible for this peculiar behaviour. Based on transmission electron microscopy observations of glasses and glass-ceramics, a novel growth mechanism is proposed for cabbage-shaped mica crystal aggregates in machinable mica glass-ceramics. In this model, crystallization takes place along isocompositional lines at or not far from the surface of the liquid–liquid phase separation droplets. Due to high growth rates, diffusion has only little impact on the crystal growth. Finally, experimental reasons for earlier misinterpretations are discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
