Devitrification Kinetics and Mechanism of K 2 O–CaO–SrO–BaO–B 2 O 3 –SiO 2 Glass‐Ceramic

The devitrification kinetics and mechanism of a low‐dielectric, low‐temperature, cofirable K 2 O–CaO–SrO–BaO–B 2 O 3 –SiO 2 glass‐ceramic have been investigated. Crystalline phases including cristobalite (SiO 2 ) and pseudowollastonite ((Ca,Ba,Sr) SiO 3 ) are formed during firing. Activation energy analysis shows that the nucleation of the crystalline phases is controlled by phase separation of the glass. The crystallization kinetics of both cristobalite and pseudowollastonite obey Avrami‐like behavior, and the results show an apparent activation energy close to that of the diffusion of alkaline and alkali ions in the glass, suggesting that diffusion is rate limiting. The above conclusion is further supported by analysis of measured growth rates.