Glass-forming ability and stability of calcium aluminate optical glasses

Calcium aluminate optical glasses were prepared by air quenching, using Al₂O₃ (A), CaCO₃ (C), Na₂CO₃ (N), BaO (B) and SrCO₃ (S) as preparatory powders. The glass-forming ability and stability were determined using differential thermal analysis (DTA). The CANS composition showed the best glass-forming ability, while the CAN composition showed the worst one. The CAB, CAS and CA compositions showed small isolated crystals, while the CAS and CANB showed partial crystallization with a slightly large portion. The CANB glass was determined to be the most stable glass among the glasses prepared.