Abstract
The crystn. kinetics of 1T-wollastonite in the CaO-SiO2 system starting from a stoichiometric glass was investigated in situ by x-ray synchrotron powder diffraction at 800-900�. At higher temp., 1T-wollastonite converts into the 2M polytype. The collected data were analyzed by the Avrami models and kinetic parameters seem to indicate a nucleation deceleratory controlled mechanism with 1D growth. The preliminary results of this study are part of a general project aimed to investigate polymorphism and polytypism of wollastonite and the related phases, esp. the role of the kinetic parameters in the formation of the polytypes in the pyroxenoid series. [on SciFinder(R)]
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