P-V-T equation of state of siderite to 33GPa and 1673K

Konstantin D. Litasov, Anton Shatskiy, Pavel N. Gavryushkin, Igor S. Sharygin, Peter I. Dorogokupets, Anna M. Dymshits, Eiji Ohtani, Yuji Higo, Kenichi Funakoshi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Pressure-volume-temperature relations have been measured to 33GPa and 1673K for natural siderite (Fe0.95Mn0.05CO3) using synchrotron X-ray diffraction with a multianvil apparatus at the 'SPring-8' facility. A least-squares fit of the room-temperature compression data to a third-order Birch-Murnaghan equation of state (EOS) yielded K0=120±1GPa and K'=3.57±0.09, with fixed V0=293.4±0.1Å3. Further analysis of the high-temperature compression data yielded the temperature derivative of the bulk modulus (∂ KT/∂T)P=-0.015±0.001GPa/K and zero-pressure thermal expansion α=a0+a1T with a0=3.57(9)×10-5K-1 and a1=0.06(14)×10-8K-2. The analysis of axial compressibility indicates that the c-axis is more compressible (KTc=59±1GPa at K'=2.7±0.1) than the a-axis (KTa=166±2GPa at K'=14.0±0.8). The present thermal EOS enables accurate calculation the density and thermodynamic properties of siderite to the deep mantle conditions.

Original languageEnglish
Pages (from-to)83-87
Number of pages5
JournalPhysics of the Earth and Planetary Interiors
Publication statusPublished - 2013 Nov


  • Carbonate
  • Equation of state
  • Mantle
  • Siderite
  • Synchrotron X-ray diffraction

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science


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