The nonisothermal devitrification of GeO2 and 3BaO.5SiO2 glasses was studied to show that, from DTA curves, the activation energy of crystal growth can be calcd., surface and bulk crystn. can be distinguished, and usually no data concerning nucleation rate can be obtained. To describe the glass-crystal transformation a W.A. Johnson and R.F. Mehl (1939) and M. Avrami (1941) rate equation was assumed. The results obtained agree with those obtained under isothermal conditions.
Kinetics of nonisothermal devitrification / A., Marotta; A., Buri; Pernice, Pasquale. - In: PHYSICS AND CHEMISTRY OF GLASSES. - ISSN 0031-9090. - STAMPA. - 21:(1980), pp. 94-97.
Kinetics of nonisothermal devitrification
PERNICE, PASQUALE
1980
Abstract
The nonisothermal devitrification of GeO2 and 3BaO.5SiO2 glasses was studied to show that, from DTA curves, the activation energy of crystal growth can be calcd., surface and bulk crystn. can be distinguished, and usually no data concerning nucleation rate can be obtained. To describe the glass-crystal transformation a W.A. Johnson and R.F. Mehl (1939) and M. Avrami (1941) rate equation was assumed. The results obtained agree with those obtained under isothermal conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
