### Abstract

Pressure-volume-temperature relations have been measured to 33GPa and 1673K for natural siderite (Fe_{0.95}Mn_{0.05}CO_{3}) 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 K_{0}=120±1GPa and K'=3.57±0.09, with fixed V_{0}=293.4±0.1Å^{3}. Further analysis of the high-temperature compression data yielded the temperature derivative of the bulk modulus (∂ K_{T}/∂T)_{P}=-0.015±0.001GPa/K and zero-pressure thermal expansion α=a_{0}+a_{1}T with a_{0}=3.57(9)×10^{-5}K^{-1} and a_{1}=0.06(14)×10^{-8}K^{-2}. The analysis of axial compressibility indicates that the c-axis is more compressible (K_{Tc}=59±1GPa at K'=2.7±0.1) than the a-axis (K_{Ta}=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 language | English |
---|---|

Pages (from-to) | 83-87 |

Number of pages | 5 |

Journal | Physics of the Earth and Planetary Interiors |

Volume | 224 |

DOIs | |

Publication status | Published - 2013 Nov 1 |

### Keywords

- 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

## Fingerprint Dive into the research topics of 'P-V-T equation of state of siderite to 33GPa and 1673K'. Together they form a unique fingerprint.

## Cite this

*Physics of the Earth and Planetary Interiors*,

*224*, 83-87. https://doi.org/10.1016/j.pepi.2013.07.011