publication . Article . 2014

MgO melting curve constraints from shock temperature and rarefaction overtake measurements in samples preheated to 2300 K

O V Fat'yanov; P D Asimow;
Open Access
  • Published: 07 May 2014
  • Publisher: Institute of Physics
  • Country: United States
Abstract
Continuing our effort to obtain experimental constraints on the melting curve of MgO at 100-200 GPa, we extended our target preheating capability to 2300 K. Our new Mo capsule design holds a long MgO crystal in a controlled thermal gradient until impact by a Ta flyer launched at up to 7.5 km/s on the Caltech two-stage light-gas gun. Radiative shock temperatures and rarefaction overtake times were measured simultaneously by a 6-channel VIS/NIR pyrometer with 3 ns time resolution. The majority of our experiments showed smooth monotonic increases in MgO sound speed and shock temperature with pressure from 197 to 243 GPa. The measured temperatures as well as the slo...
Subjects
free text keywords: Temperature gradient, Partial melting, Radiative transfer, Rarefaction, Chemistry, Thermodynamics, Compression (physics), Melting curve analysis, Pyrometer, law.invention, law, Speed of sound
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