Crystallization Of Glasses Of The Antimony(Iv) Selenide-Germanium Selenide-Selenium System (In French) N Clavaguera Et Al. Barcelona University

The crystallisation of glasses of the Sb2Se3-GeSe2-Se system was studied calorimetrically. Samples of composition Ge5Sb15Se80 and Ge12.5Sb25Se62.5 were crystallised under both isothermal and non-isothermal conditions. In each case the activation energy decreased as the temperature of the transformation increased; e.g. for the Ge5Sb15Se80 deltaH = 188 +/- 5 kJ/mol at 378 K and 112 +/- 2 kJ/mol at 526 K. Thus, it is not possible to quote a constant activation energy for the crystallisation of these glasses although at agiven temperature, both isothermal and non-isothermal methods give the same results.