Some insights into fragility as a function of thermodynamic parameters: From orientational to structural glass transitions

• Published in: Chemical physics letters Vol. 446; no. 1; pp. 71 - 76
• Main Authors: Salud, J., López, D.O., Diez-Berart, S., Pérez-Jubindo, M.A., de la Fuente, M.R., Rute, M.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 26-09-2007
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2007.08.052

The work in this Letter is aimed at proposing, among other proposals, a link between the thermodynamic (Δ
C
p
/
C
p,gl
) relation and kinetic (
F
1/2)-parameters.
The work in this Letter is aimed at propossing some ideas on the definition of the fragility as a function of thermodynamic parameters for a reduced set of OG-formers: cycloheptanol, cyclooctanol and their binary mixtures. Previous possible proposals such as Δ
C
p
or
(
Δ
T
gl
/
T
gl
A
)
are now reexamined. Among other proposals, (Δ
C
p
/
C
p,gl
) can correlate with
(
Δ
T
gl
/
T
gl
A
)
such that a link between the thermodynamic (Δ
C
p
/
C
p,gl
) relation and kinetic (
F
1/2)-parameters can be outlined. Data either from the literature or measured by us of certain glass-forming materials have been used to extend this link to a more general approach. In addition, an alternative proposal in which the volume is considered as a thermodynamic variable is also discussed.