Investigation of the temperature in dense carbon near the solid-liquid phase transition between 100 GPa and 200 GPa with spectrally resolved X-ray scattering - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue High Energy Density Physics Année : 2019

Investigation of the temperature in dense carbon near the solid-liquid phase transition between 100 GPa and 200 GPa with spectrally resolved X-ray scattering

J. Helfrich
  • Fonction : Auteur
J. Vorberger
S. Frydrych
  • Fonction : Auteur
G. Schaumann
  • Fonction : Auteur
M. Gauthier
  • Fonction : Auteur
L.B. B Fletcher
  • Fonction : Auteur
B. Nagler
  • Fonction : Auteur
B. Barbrel
  • Fonction : Auteur
B. Bachmann
  • Fonction : Auteur
E.J. J Gamboa
  • Fonction : Auteur
S. Göde
  • Fonction : Auteur
E. Granados
  • Fonction : Auteur
H.J. J Lee
  • Fonction : Auteur
P. Neumayer
  • Fonction : Auteur
W. Schumaker
  • Fonction : Auteur
T. Döppner
R.W. W Falcone
  • Fonction : Auteur
S.H. H Glenzer
  • Fonction : Auteur
M. Roth
  • Fonction : Auteur
D. Kraus

Résumé

We present experiments investigating dense carbon at pressures between 100 GPa and 200 GPa and temperatures between 5,000 K and 15,000 K. High-pressure samples with different temperatures were created by laser-driven shock compression of graphite and varying the initial density from 1.53 g/cm 3 to 2.21 g/cm 3 and the drive laser intensity from 7.1 TW/cm 2 to 14.2 TW/cm 2. In order to deduce temperatures, spectrally resolved X-ray scattering was applied to determine ion-ion structure factors at a scattering vector of k = 4.12·10 m , 10 1 which shows high sensitivity to temperature for the investigated sample conditions. After comparison to corresponding DFT-MD simulations, we were able to assign each structure factor a temperature. This information is indicative of the expected temperature range for the melting line of carbon at high pressures and can be compared to theoretical predictions.

Dates et versions

hal-02378710 , version 1 (25-11-2019)

Identifiants

Citer

J. Helfrich, J. Vorberger, S. Frydrych, G. Schaumann, A. Ravasio, et al.. Investigation of the temperature in dense carbon near the solid-liquid phase transition between 100 GPa and 200 GPa with spectrally resolved X-ray scattering. High Energy Density Physics, 2019, 32, pp.56-62. ⟨10.1016/j.hedp.2019.05.001⟩. ⟨hal-02378710⟩
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