Refractive index and polarizability of polystyrene under shock compression

Refractive index and polarizability of polystyrene under shock compression The refractive index, polarizability and thermodynamic response of polystyrene under shock compression were investigated through experiments and theoretical analysis, and a relationship between the refractive index and the density, pressure and temperature of the polystyrene was obtained. Above a pressure of 20 GPa, an obvious inflexion was observed in how the refractive index of the polystyrene varied with the thermodynamic variables; in particular, it was found to depend strongly on the temperature (as obtained using a semiempirical complete equation of state). Relating the measured refractive index to the polarizability indicates that the polarizability decreased from 1.28 × 10−23 cm3 at ambient conditions, to 0.98 × 10−23 cm3 at pressure of 33 GPa, indicating that the lowest direct band gap $$ E_{t} $$ E t of polystyrene becomes < 2 eV, similar to that of many semiconductor materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Refractive index and polarizability of polystyrene under shock compression

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2489-8
Publisher site
See Article on Publisher Site

Abstract

The refractive index, polarizability and thermodynamic response of polystyrene under shock compression were investigated through experiments and theoretical analysis, and a relationship between the refractive index and the density, pressure and temperature of the polystyrene was obtained. Above a pressure of 20 GPa, an obvious inflexion was observed in how the refractive index of the polystyrene varied with the thermodynamic variables; in particular, it was found to depend strongly on the temperature (as obtained using a semiempirical complete equation of state). Relating the measured refractive index to the polarizability indicates that the polarizability decreased from 1.28 × 10−23 cm3 at ambient conditions, to 0.98 × 10−23 cm3 at pressure of 33 GPa, indicating that the lowest direct band gap $$ E_{t} $$ E t of polystyrene becomes < 2 eV, similar to that of many semiconductor materials.

Journal

Journal of Materials ScienceSpringer Journals

Published: May 29, 2018

References

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