Investigation of the solid-liquid phase transition of carbon at 150 GPa with spectrally resolved X-ray scattering

J. Helfrich*, D. Kraus, A. Ortner, S. Frydrych, G. Schaumann, N. J. Hartley, G. Gregori, B. Kettle, D. Riley, D. C. Carroll, M. M. Notley, C. Spindloe, M. Roth

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have resolved the solid-liquid phase transition of carbon at pressures around 150GPa. High-pressure samples of different temperatures were created by laser-driven shock compression of graphite and varying the initial density from 1.30g/cm3 to 2.25g/cm3. In this way, temperatures from 5700K to 14,500K could be achieved for relatively constant pressure according to hydrodynamic simulations. From measuring the elastic X-ray scattering intensity of vanadium K-alpha radiation at 4.95keVat a scattering angle of 126°, which is very sensitive to the solid-liquid transition, we can determine whether the sample had transitioned to the fluid phase. We find that samples of initial density 1.3g/cm3 and 1.85g/cm3 are liquid in the compressed states, whereas samples close to the ideal graphite crystal density of 2.25g/cm3 remain solid, probably in a diamond-like state.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalHigh Energy Density Physics
Volume14
Early online date06 Mar 2015
DOIs
Publication statusPublished - Mar 2015

Keywords

  • Laser-driven shock wave
  • Liquid carbon
  • Warm dense matter
  • X-ray Thomson scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Radiation

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    Helfrich, J., Kraus, D., Ortner, A., Frydrych, S., Schaumann, G., Hartley, N. J., Gregori, G., Kettle, B., Riley, D., Carroll, D. C., Notley, M. M., Spindloe, C., & Roth, M. (2015). Investigation of the solid-liquid phase transition of carbon at 150 GPa with spectrally resolved X-ray scattering. High Energy Density Physics, 14, 38-43. https://doi.org/10.1016/j.hedp.2015.02.003