Hugoniot data for carbon at megabar pressures.
We present an experimental point for the carbon equation of state (EOS) at megabar pressures, obtained by laser-driven shock waves. The rear side emissivity of "two-materials two-steps" targets (Al-C) was recorded with space and time resolution and, by applying the impedance mismatch method, allowed a direct determination of relative EOS points. Experiments were performed at the PALS and LULI laboratories using carbon samples with two different values of initial density, in order to explore a wider region of the phase diagram. Previously unreached pressures were obtained. The results are compared with previous experiments and with available theoretical models and seem to show a high compressibility of carbon at megabar pressures.
Batani
D
D
Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca and INFM, Piazza della Scienza 3, 20126 Milan, Italy.
Strati
F
F
Stabile
H
H
Tomasini
M
M
Lucchini
G
G
Ravasio
A
A
Koenig
M
M
Benuzzi-Mounaix
A
A
Nishimura
H
H
Ochi
Y
Y
Ullschmied
J
J
Skala
J
J
Kralikova
B
B
Pfeifer
M
M
Kadlec
Ch
Ch
Mocek
T
T
Präg
A
A
Hall
T
T
Milani
P
P
Barborini
E
E
Piseri
P
P