Abstract
Bulk glasses of the system Ga
20Sb
x
S
80−
x
(
x
=
5 and 40) were prepared for the first time by the known melt quenching technique. Non-isothermal differential scanning calorimetric (DSC) measurements of as-quenched Ga
20Sb
x
S
80−
x
(
x
=
5 and 40) chalcogenide glasses reveal that the characteristic temperatures e.g. the glass transition temperature (
T
g), the temperature corresponding to the maximum crystallization rate (
T
p) recorded in the temperature range 400–650
K for
x
=
5 and 480–660
K for
x
=
40 are strongly dependent on heating rate and Sb content. Upon heating, these glasses show a single glass transition temperature (
T
g) and double crystallization temperatures (
T
p1 and
T
p2) for
x
=
5 which overlapped and appear as a single crystallization peak (
T
p) for
x
=
40. The activation energies of crystallization
E
c were evaluated by three different methods. The crystallization data were examined in terms of recent analysis developed for non-isothermal conditions. The crystalline phases resulting from (DSC) have been identified using X-ray diffraction.