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Measuring the structure and equation of state of polyethylene terephthalate at megabar pressures

  • J. Lütgert
  • , J. Vorberger
  • , N. J. Hartley
  • , K. Voigt
  • , M. Rödel
  • , A. K. Schuster
  • , A. Benuzzi-Mounaix
  • , S. Brown
  • , T. E. Cowan
  • , E. Cunningham
  • , T. Döppner
  • , R. W. Falcone
  • , L. B. Fletcher
  • , E. Galtier
  • , S. H. Glenzer
  • , A. Laso Garcia
  • , D. O. Gericke
  • , P. A. Heimann
  • , H. J. Lee
  • , E. E. McBride
  • A. Pelka, I. Prencipe, A. M. Saunders, M. Schölmerich, M. Schörner, P. Sun, T. Vinci, A. Ravasio, D. Kraus
  • Institute of Radiooncology - OncoRay
  • Institut für Festkörperphysik
  • Technical University Dresden
  • Stanford Linear Accelerator Center
  • Institute of Nuclear and Particle Physics
  • Lawrence Livermore National Laboratory
  • Department of Physics
  • University of California, Berkeley
  • Ernest Orlando Lawrence Berkeley National Laboratory
  • University of Warwick
  • European XFEL GmbH
  • Universität Rostock
  • Sorbonne Université

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We present structure and equation of state (EOS) measurements of biaxially orientated polyethylene terephthalate (PET, (C10H8O4)n, also called mylar) shock-compressed to (155 ± 20) GPa and (6000 ± 1000) K using in situ X-ray diffraction, Doppler velocimetry, and optical pyrometry. Comparing to density functional theory molecular dynamics (DFT-MD) simulations, we find a highly correlated liquid at conditions differing from predictions by some equations of state tables, which underlines the influence of complex chemical interactions in this regime. EOS calculations from ab initio DFT-MD simulations and shock Hugoniot measurements of density, pressure and temperature confirm the discrepancy to these tables and present an experimentally benchmarked correction to the description of PET as an exemplary material to represent the mixture of light elements at planetary interior conditions.

Original languageEnglish
Article number12883
JournalScientific Reports
Volume11
Issue number1
DOIs
Publication statusPublished - 1 Dec 2021

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