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Formation of β‐Silicon Nitride Crystals from (Si,Al,Mg,Y)(O,N) Liquid: II, Population Dynamics and Coarsening Kinetics
Author(s) -
Wang Lingling,
Tien TsengYing,
Chen IWei
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03518.x
Subject(s) - kinetics , dissolution , silicon nitride , materials science , precipitation , sialon , crystallography , nitride , population , volume (thermodynamics) , transformation (genetics) , silicon , distribution (mathematics) , thermodynamics , mineralogy , chemistry , nanotechnology , metallurgy , mathematics , physics , mathematical analysis , ceramic , biochemistry , demography , layer (electronics) , quantum mechanics , sociology , gene , meteorology
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′‐SiAlON 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.