Physics and Chemistry of Minerals

, Volume 40, Issue 1, pp 73–80

The PVT equation of state of CaPtO3 post-perovskite

  • Simon A. Hunt
  • Alex Lindsay-Scott
  • Ian G. Wood
  • Michael W. Ammann
  • Takashi Taniguchi
Original Paper

Abstract

Orthorhombic post-perovskite CaPtO3 is isostructural with post-perovskite MgSiO3, a deep-Earth phase stable only above 100 GPa. Energy-dispersive X-ray diffraction data (to 9.4 GPa and 1,024 K) for CaPtO3 have been combined with published isothermal and isobaric measurements to determine its PVT equation of state (EoS). A third-order Birch–Murnaghan EoS was used, with the volumetric thermal expansion coefficient (at atmospheric pressure) represented by α(T) = α0 + α1(T). The fitted parameters had values: isothermal incompressibility, \( K_{{T_{0} }} \) = 168.4(3) GPa; \( K_{{T_{0} }}^{\prime } \) = 4.48(3) (both at 298 K); \( \partial K_{{T_{0} }} /\partial T \) = −0.032(3) GPa K−1; α0 = 2.32(2) × 10−5 K−1; α1 = 5.7(4) × 10−9 K−2. The volumetric isothermal Anderson–Grüneisen parameter, δT, is 7.6(7) at 298 K. \( \partial K_{{T_{0} }} /\partial T \) for CaPtO3 is similar to that recently reported for CaIrO3, differing significantly from values found at high pressure for MgSiO3 post-perovskite (−0.0085(11) to −0.024 GPa K−1). We also report axialPVT EoS of similar form, the first for any post-perovskite. Fitted to the cubes of the axes, these gave \( \partial K_{{aT_{0} }} /\partial T \) = −0.038(4) GPa K−1; \( \partial K_{{bT_{0} }} /\partial T \) = −0.021(2) GPa K−1; \( \partial K_{{cT_{0} }} /\partial T \) = −0.026(5) GPa K−1, with δT = 8.9(9), 7.4(7) and 4.6(9) for a, b and c, respectively. Although \( K_{{T_{0} }} \) is lowest for the b-axis, its incompressibility is the least temperature dependent.

Keywords

Post-perovskite Thermal equation of state Axial equations of state Calcium platinate CaPtO3 Anderson–Grüneisen parameter 

Supplementary material

269_2012_548_MOESM1_ESM.pdf (170 kb)
Supplementary material 1 (PDF 169 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Simon A. Hunt
    • 1
  • Alex Lindsay-Scott
    • 1
  • Ian G. Wood
    • 1
  • Michael W. Ammann
    • 1
  • Takashi Taniguchi
    • 2
  1. 1.Department of Earth SciencesUniversity College LondonLondonUK
  2. 2.National Institute for Materials ScienceTsukuba, IbarakiJapan

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