Isothermal kinetics of crystallization in the “fragile” Ca(NO3)2─KNO3 melts and in AgI─Ag2SO4─Ag2WO4 melts of intermediate fragility have been investigated using singlestep and multistep calorimetric techniques. Time‐temperature‐transformation curves for crystal nucleation and growth have been delineated and the temperature for maximum nucleation rate (TNN) identified. The results are compared with the kinetics of nucleation observed in other fragile systems, such as fluoride glass melts, and with classical oxide melts (such as Li2Si2O5) which have “strong” liquid characteristics. Reduced‐temperature presentations of nucleation‐rate data show qualitative correlations between TNN/TL (TL is liquidus temperature) and liquid fragility. These correlations show that strong‐liquid glass formers survive much larger supercoolings without nucleation than do fragile liquids.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of the American Ceramic Society|
|State||Published - Oct 1991|
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry