Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions

D. K. Spaulding*, R. S. McWilliams, R. Jeanloz, J. H. Eggert, P. M. Celliers, D. G. Hicks, G. W. Collins, R. F. Smith

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Laser-driven shock compression experiments reveal the presence of a phase transition in MgSiO3 over the pressure-temperature range 300-400 GPa and 10 000-16 000 K, with a positive Clapeyron slope and a volume change of similar to 6.3 (+/- 2.0) percent. The observations are most readily interpreted as an abrupt liquid-liquid transition in a silicate composition representative of terrestrial planetary mantles, implying potentially significant consequences for the thermal-chemical evolution of extrasolar planetary interiors. In addition, the present results extend the Hugoniot equation of state of MgSiO3 single crystal and glass to 950 GPa.

Original languageEnglish
Article number065701
Number of pages4
JournalPhysical Review Letters
Volume108
Issue number6
DOIs
Publication statusPublished - 8 Feb 2012

Keywords

  • LOWER MANTLE
  • MGSIO3 PEROVSKITE
  • LIQUID-PHASE
  • LASER
  • DIAGNOSTICS
  • PHOSPHORUS
  • CONVECTION
  • STATE

Cite this