Article ID Journal Published Year Pages File Type
1485922 Journal of Non-Crystalline Solids 2006 5 Pages PDF
Abstract

Pressure–volume–temperature (PVT) measurements were obtained on decahydroisoquinoline (DHIQ). From the resulting equation of state in combination with previously reported dielectric relaxation data, an analysis of the volume contribution to the dynamics was carried out for this very fragile glass-former (isobaric fragility, mP = 163). We find that the ratio of the isochoric and isobaric fragilities equals 0.71 ± 0.02, reflecting a strong temperature effect, consistent with the large fragility. The relaxation times superpose when plotted versus temperature times the specific volume raised to the 3.55 power. This is a larger value of the exponent than expected based on the fragility of DHIQ. The implication is that for molecular glass-formers, the classical Lennard-Jones 6–12 repulsive potential may represent the limit for fragile liquids.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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