Differential scanning calorimetry measurements have been performed on elemental Se as well as on Ge_xSe_94−xIn₆ (x=4, 8, and 11 at%) and on Ge_ySe_88−yIn₁₂ (y=5, 7, and 9 at%) chalcogenide glasses. From the cooling rate dependence of the fictive temperature, the apparent activation energies, Δh*, and the fragility indices, m, as defined in the strong–fragile glass-forming liquid concept, are determined. It is found that, in Ge–Se–In system, there is an evolution from strong (m=67) to fragile (m=116) glass-forming liquids. The dependence of ‘m’ on the mean-coordination number, Z, is also obtained. This dependence is rationalized by assuming that, in this glassy alloy system, there is a tendency for the formation of In₂Se₃ clusters.

Title

Physica B: Condensed Matter, Volume:389, Issue:2, 15 February 2007, Pages: 275-280

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Publisher Country

Palestine

Publication Type

Both (Printed and Online)

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Year

2007

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