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Low-Temperature Thermal, Dielectric, and Acoustic Properties of Amorphous Polymers

  • M. Jäckel
  • F. V. Schoenebeck
  • T. Eggert
  • G. Köbernik
  • U. Escher
  • B. Kluge
  • A. Gladun
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)

Abstract

The thermal conductivity λ, the specific heat c, the thermal expansion α, the acoustic and dielectric properties of polycarbonate (PC), of polystyrene (PS) and of an epoxy resin were measured in the temperature ranges between 0.1 K and 80 K (λ c) and between 4 K and 300 K (α). The measurements show the typical low-temperature behavior of amorphous solids. Below 20 K the results can be explained in the framework of the soft potential model. Above 20 K with increasing temperature λ, and α show between 30 K and 50 K a distinct decrease in slope of the temperature dependence. The sound velocity shows for PC and PS the typical decrease with increasing temperature. For PC the maximum in the dielectric losses shifts with increasing frequency and at increasing pressure to higher temperature.

Keywords

Thermal Conductivity Sound Velocity Amorphous Solid Distinct Decrease Boson Peak 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    R.C. Zeller, R.O Pohl, Thermal conductivity and specific heat of noncrystalline solids. Phys Rev B 4: 2029 (1971).Google Scholar
  2. 2.
    U. Buchenau, Yu.M. Galperin, V.L Gurevich, D.A. Parshin, M.A.Ramos, H.R Schober, Interaction of soft modes and sound waves in glasses. Phys Rev B 46: 2798 (1992)ADSCrossRefGoogle Scholar
  3. 3.
    P.W Anderson, B.J. Halperin, C.M. Varma, Anomalous low-temperature thermal properties of glass and spin glasses. Phil.Mag. 25: 1 (1971)Google Scholar
  4. 4.
    M. Jäckel, W. Scheibner, Some peculiarities in thermal and relaxation properties of polymers and related materials at low temperatures. Phys.stat.sol. (a) 134: 391 (1992)ADSCrossRefGoogle Scholar
  5. 5.
    M. Jäckel, F. v. Schoenebeck, U. Escher, A. Gladun, Low-temperature thermal properties of amorphous polycarbonat Proceedings LT 21: Czechoslovak Journal of Physics, 46: 2249 (1996)Google Scholar
  6. 6.
    M. Jäckel, M. Müller, A Licea Claverie, K.F. Arndt, Thermal conductivity of modified epoxy resins with different cross-link densities at low temperatures. Cryogenics 31: 228 (1991)Google Scholar
  7. U. Escher, E. Wöller, E. Hegenbarth, Thermal expansion of high-Ta-superconducting ceramics and polycarbonat. Adv. in Cryog. Eng. 40A: 125 (1994)Google Scholar
  8. 8.
    E.P. Papadakis, Absolute accuracy of the pulse-echo overlap method and the pulse-superposition method for ultrasonic velocity. JAcoust. Soc. Am. 52: 843 (1972)ADSCrossRefGoogle Scholar
  9. 9.
    M.Jäckel, F.v. Schoenebeck, U. Escher, A. Gladun, Low-Temperature Thermal Properties of Amorphous Polycarbonate and Polystyrene Proceedings ICEC 16/ICMC, Kitakyushu, May 1996, 2023Google Scholar
  10. 10.
    J.E. Graebner, B. Golding, L.C. Allen, Phonon localization in glasses. Phys Rev B 34: 5696 (1986)ADSCrossRefGoogle Scholar
  11. 11.
    A. Nittke, M. Scherl, P. Esquinazi, W. Lorenz, J. Li, F. Pobell, Low temperature heat release, sound velocity and attenuation, specific heat and thermal conductivity in polymers. J Low Temp. Phys.98: 517 (1995)Google Scholar
  12. 12.
    L. Gil, M.A. Ramos, A. Bringer, U. Buchenau, Phys. Rev. Lett. 70, 2: 182 (1993)ADSCrossRefGoogle Scholar
  13. 13.
    W.A. Phillips: „Amorphous Solids Low Temperature Properties“, Springer Verlag, Berlin, Heidelberg, New York, 1981Google Scholar
  14. 14.
    M. Jäckel, U. Leucke, Thermische Tieftemperatureigenschaften von Polystyrol Verhandl. DPG (VI) 29: 1504 (1994) (unpublished)Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. Jäckel
    • 1
  • F. V. Schoenebeck
    • 1
  • T. Eggert
    • 1
  • G. Köbernik
    • 1
  • U. Escher
    • 1
  • B. Kluge
    • 1
  • A. Gladun
    • 1
  1. 1.Institut für TieftemperaturphysikTechnische Universität DresdenDresdenGermany

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