Formation of β-Silicon Nitride Crystals from (Si,Al,Mg,Y)(O,N) Liquid: II, Population Dynamics and Coarsening Kinetics

Autor:	Ling-Ling Wang, I-Wei Chen, Tseng-Ying Tien
Rok vydání:	2003
Předmět:	Sialon education.field_of_study Materials science Precipitation (chemistry) Population Analytical chemistry Mineralogy Crystal growth Nitride Crystal chemistry.chemical_compound Silicon nitride chemistry Materials Chemistry Ceramics and Composites education Dissolution
Zdroj:	Journal of the American Ceramic Society. 86:1586-1591
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.2003.tb03518.x
Popis:	Precipitation, growth, and coarsening of Si 3 N 4 crystals in (Si,Al,Mg,Y)(O,N) liquids at 1680°C has been studied. Contrary to the common observation in kinetics, coarsening rates of crystals in length and width are found to accelerate when the total volume of crystals remains little changed. This is attributed to the concomitant β-Si 3 N 4 to β'-SiAION transformation, which introduces an additional driving force for crystal dissolution and reprecipitation. As a result of the additional driving force, which has a nonmonotonic size dependence, the normalized size distribution is expected to evolve with time, initially broadening, then shifting skewing as the transformation passes the midpoint, and finally converging to a sharp distribution as the transformation completes. These evolutions have been observed in all the compositions studied.
Databáze:	OpenAIRE
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