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Crystallization kinetics of amorphous S20Se80

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Abstract

The effect of temperature on the crystallization kinetics of bulk amorphous S20Se80 has been studied using differential scanning calorimetry. Using the empricial Avrami expressions, a number of kinetic parameters has been determined. The order of the reactionn was found to be 2.3 for the range of temperature 340–365 K and 1.6 in the range of temperature between 370–400 K. This range ofn indicates that the crystallization process is diffusion controlled growth with decreasing nucleation rate. The activation energy was found to be 3, 1.1 ev depending on the same range of temperatures.

A time-temperature-transformation (TTT) curves has been plotted from isothermal results over the temperature range 340 K to 400 K showing the presence of minimum at 374 K. From theTTT curves the critical cooling rate required to avoid 25, 50, 75 and 100% crystallization was found to be 2.4, 1.79, 0.72 and 0.42‡C/sec respectively.

Zusammenfassung

Mittels DSC wurde der Einflu\ der Temperatur auf die Kristallisierungskinetik von amorphem S20Se80 untersucht. Unter Verwendung der empirischen Avrami Gleichungen wurde eine Anzahl kinetischer Grö\en ermittelt. Danach ergab sich die Reaktionsordnung n für den Temperaturbereich 340–365 K mit 2.3 und für den Temperaturbereich 370–400 K mit 1.6. Dieses Intervall fürn zeigt, da\ es sich beim Kristallisationsproze\ um ein diffusionsbestimmtes Wachstum mit sinkender Kristallkeimbildungsgeschwindigkeit handelt. Für die Aktivierungsenergie wurde für die gleichen Temperaturbereiche ein Wert von 3 bzw. 1.1 eV gefunden.

Ausgehend von den isothermen Ergebnissen im Temperaturbereich 340–400 K wurde eine Zeit-Temperatur-Transformationskurve (TTT) dargestellt, die bei 374 K die Gegenwart eines Minimum aufweist. Auf der Basis derTTT-Kurven konnte für eine 25-, 50-, 75-bzw. 100-prozentige Kristallisation eine kritische Kühlgeschwindigkeit von 2.4, 1.79, 0.72 bzw. 0.42‡C/s ermittelt werden.

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Authors and Affiliations

  1. Physics Department, Al-Azhar University for Girles, Al-Azhar, Egypt

    E. A. Mahmoud

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  1. E. A. Mahmoud
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The author wish to thank Prof. Dr. M.F. Kotkata Department of Physics, at Ain Shams University in Cairo, for his valuable discussions, and also Dr. F. Sale the head of the Metallurgy department at UMIST in Manchester. Who gave the facility of doing the experimental work in his department.

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Mahmoud, E.A. Crystallization kinetics of amorphous S20Se80 . Journal of Thermal Analysis 36, 1481–1486 (1990). https://doi.org/10.1007/BF01914071

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