Thermoelastic Equation of State of Monoclinic Pyroxene: CaMgSi2O6 Diopside.

• Zhao Yusheng

  LANSCE, Los Alamos National Laboratory

• Dreele R. B. Von

  LANSCE, Los Alamos National Laboratory

• Zhang J. Z.

  CHiPR, State University of New York at Stony Brook

• Weidner D. J.

  CHiPR, State University of New York at Stony Brook

Bibliographic Information

Other Title

• Thermoelastic Equation of State of Mono

Abstract

We have conducted an in situ synchrotron x-ray diffraction study on a monoclinic pyroxene: CaMgSi₂O₆ diopside at simultaneous high pressures and high temperatures up to 8. 2 GPa and 1280 K. A modified Rietveld profile refinement program has been applied to refine the diffraction spectra of low symmetry and multiple phases observed in energy dispersive mode. Thermoelastic parameters for diopside CaMgSi₂O₆ are derived by fitting the P-V-T data to the high-T Birch-Murnaghan equation of state. We obtained isothermal bulk modulus K_TO =109. 1 GPa with a pressure derivative of bulk modulus K'=∂K/∂P=4. 84, temperature derivative of bulk modulus K=∂K/∂T=-2. 05×10^-2 GPa/K, volumetric thermal expansivity α=a+ bT with values of a=2. 32×10^-5K^-1 and b=1. 88×10^-8K^-2.

Journal

• The Review of High Pressure Science and Technology

  The Review of High Pressure Science and Technology 7 25-27, 1998

  The Japan Society of High Pressure Science and Technology

Keywords

• clinopyroxene
• thermoelasticity
• Rietveld refinement

Details

• CRID: 1390001204381772288
• NII Article ID: 10002688604
• NII Book ID: AN10452913
• DOI: 10.4131/jshpreview.7.25
• COI: 1:CAS:528:DyaK1cXktFymsL8%3D
• ISSN: 13481940
• ISSN: 0917639X
• NDL BIB ID: 4493828
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4493828
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed