Investigation of the solid-liquid phase transition of carbon at 150 GPa with spectrally resolved X-ray scattering
Data(s) |
01/03/2015
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Resumo |
<p>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/cm<sup>3</sup> to 2.25g/cm<sup>3</sup>. 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/cm<sup>3</sup> and 1.85g/cm<sup>3</sup> are liquid in the compressed states, whereas samples close to the ideal graphite crystal density of 2.25g/cm<sup>3</sup> remain solid, probably in a diamond-like state.</p> |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
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 , vol 14 , pp. 38-43 . DOI: 10.1016/j.hedp.2015.02.003 |
Palavras-Chave | #Laser-driven shock wave #Liquid carbon #Warm dense matter #X-ray Thomson scattering #/dk/atira/pure/subjectarea/asjc/3100/3106 #Nuclear and High Energy Physics #/dk/atira/pure/subjectarea/asjc/3100/3108 #Radiation |
Tipo |
article |