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Title: 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

Journal Article · · High Energy Density Physics
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [3];  [4];  [5];  [3];  [3]; ORCiD logo [3];  [3];  [6];  [3];  [5];  [4];  [3];  [1] more »; ORCiD logo [7] « less
  1. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
  2. Helmholtz-Zentrum Dresden (HZD), (Germany). Inst. of Radiation Physics
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of California, Berkeley, CA (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  7. Helmholtz-Zentrum Dresden (HZD), (Germany). Inst. of Radiation Physics; Univ. of California, Berkeley, CA (United States)
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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/cm3 to 2.21 g/cm3 and the drive laser intensity from 7.1 TW/cm2 to 14.2 TW/cm2. 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 ∙ 1010m-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.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; AC02-76SF00515; SF00515; FG52-10NA29649; DENA0001859; 18-ERD-033
OSTI ID:
1603871
Alternate ID(s):
OSTI ID: 1701888
Report Number(s):
LLNL-JRNL-739439; 893058; TRN: US2104161
Journal Information:
High Energy Density Physics, Vol. 32, Issue C; ISSN 1574-1818
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Figures / Tables (11)

Figure 1(p. 4)figure Figure 1
Figure 2(p. 4)figure Figure 2
Figure 3(p. 5)figure Figure 3
Figure 4(p. 7)figure Figure 4
Figure 5(p. 7)figure Figure 5
Figure 6(p. 7)figure Figure 6
Table 1(p. 7)table Table 1
Figure 7(p. 8)figure Figure 7
Figure 8(p. 9)figure Figure 8
Table 2(p. 9)table Table 2
Figure 9(p. 10)figure Figure 9

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Warm dense matter
X-ray thomson scattering
Shock compression
DFT-MD Simulations
Carbon