Elasticity of MgO to 11 GPa with an independent absolute pressure scale: Implications for pressure calibration

Baosheng Li, Kelly Woody, Jennifer Kung

研究成果: Article同行評審

54 引文 斯高帕斯(Scopus)

摘要

P and S wave velocities and unit cell parameters (density) of MgO are measured simultaneously up to 11 GPa using combined ultrasonic interferometry and in situ X-ray diffraction techniques. The elastic bulk and shear moduli as well as their pressure derivatives are obtained by fitting the measured velocity and density data to the third-order finite strain equations, yielding Kos = 163.5(11) GPa, K'os = 4.20(10), Go = 129.8(6) GPa, and G'o = 2.42(6), independent of pressure. These properties are subsequently, used in a Birch-Murnaghan equation of state to determine the sample pressures at the observed strains. Comparison of the 300K isothermal compression of MgO indicates that current pressure scales from recent studies are in better than 1.5% agreement. We find that pressures derived from secondary pressure standards (NaCl, ruby fluorescence) at 300K are lower than those from current MgO scales by 5-8% (∼6% on average) in the entire pressure range of the current experiment. If this is taken into account, discrepancy in previous static compression studies on MgO at 300K can be reconciled, and a better agreement with the present study can be achieved.

原文English
文章編號B11206
期刊Journal of Geophysical Research: Solid Earth
111
發行號11
DOIs
出版狀態Published - 2006 十一月 4

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球化學與岩石學
  • 地球與行星科學(雜項)
  • 空間與行星科學

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