The devitrification of glassy PbGeO3 was studied and interpreted by means of isothermal and non-isothermal Johnson-Mehl-Avrami equations. In the case of the non-isothermal approach, several approximated equations proposed by various authors were considered in order to obtain both the activation energy Ea and the Avrami morphological coefficient n of the crystallisation process. A critical discussion of the Avrami coefficient on the basis of experimental morphological evidence is also presented.. A critical discussion of the Avrami coefficient on the basis of experimental morphological evidence is also presented.
Devitrification kinetics of PbGeO3: an isothermal and non-isothermal study
RICCARDI, MARIA PIAMethodology
2002-01-01
Abstract
The devitrification of glassy PbGeO3 was studied and interpreted by means of isothermal and non-isothermal Johnson-Mehl-Avrami equations. In the case of the non-isothermal approach, several approximated equations proposed by various authors were considered in order to obtain both the activation energy Ea and the Avrami morphological coefficient n of the crystallisation process. A critical discussion of the Avrami coefficient on the basis of experimental morphological evidence is also presented.. A critical discussion of the Avrami coefficient on the basis of experimental morphological evidence is also presented.File in questo prodotto:
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