TY - JOUR
T1 - Viscous liquids and glasses under high pressure
AU - Oliver, W. F.
AU - Herbst, C. A.
AU - Wolf, George
N1 - Funding Information:
This work was supported in part by NSF contract number EAR 8657437 and by ONR contract number N00014-87-K0471. In addition, the authors would like to thank Professors Austin Angell and Stuart Lindsay for helpful discussions regarding this work.
PY - 1991/6/11
Y1 - 1991/6/11
N2 - The isomeric pentane system, as well as other systems, was studied as a function of pressure via Brillouin scattering. Room temperature experiments were carried out at different scattering angles in a Merrill-Bassett diamond anvil cell. The scattered light was analyzed using a nine-pass tandem Fabry-Perot interferometer. Isopentane and mixtures such as 1:1 pentane/isopentane vitrify at 7.4 GPa as determined by a change in the slope of the sound velocity vs. pressure curve, and in some cases by the onset of shear modes. From the sound velocity data and thermodynamic considerations, one can extend the equations of state for these systems to high pressure. When the acoustic shear mode is measureable, it is possible to calculate the high frequency shear modulus from the data. These calculations combined with the measured viscosity allow the determination of the shear relaxation time over a broad range of pressures.
AB - The isomeric pentane system, as well as other systems, was studied as a function of pressure via Brillouin scattering. Room temperature experiments were carried out at different scattering angles in a Merrill-Bassett diamond anvil cell. The scattered light was analyzed using a nine-pass tandem Fabry-Perot interferometer. Isopentane and mixtures such as 1:1 pentane/isopentane vitrify at 7.4 GPa as determined by a change in the slope of the sound velocity vs. pressure curve, and in some cases by the onset of shear modes. From the sound velocity data and thermodynamic considerations, one can extend the equations of state for these systems to high pressure. When the acoustic shear mode is measureable, it is possible to calculate the high frequency shear modulus from the data. These calculations combined with the measured viscosity allow the determination of the shear relaxation time over a broad range of pressures.
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U2 - 10.1016/0022-3093(91)90278-E
DO - 10.1016/0022-3093(91)90278-E
M3 - Article
AN - SCOPUS:0026413666
SN - 0022-3093
VL - 131-133
SP - 84
EP - 87
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
IS - PART 1
ER -