Thermal equation of state of goethite (α-FeOOH)

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The pressure–volume–temperature (P–V–T) equation of state (EoS) of natural goethite (α-FeOOH) has been determined by an X-ray diffraction study using synchrotron radiation. Fitting the volume data to the third-order Birch–Murnaghan EoS yielded an isothermal bulk modulus, B0 of 85.9(15) GPa, and a pressure derivative of the bulk modulus, B′, of 12.6(8). The temperature derivative of the bulk modulus, (∂B/∂T)P, was –0.022(9) GPa K−1. The thermal expansion coefficient α0 was determined to be 4.0(5) × 10−5 K−1.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalHigh Pressure Research
Issue number2
Publication statusPublished - 2017 Apr 3


  • equation of state
  • goethite
  • hydrous mineral
  • Iron oxyhydroxide
  • X-ray diffraction


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