Compressibility of the high-pressure polymorph of AlOOH to 17 GPa

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The equation of state of δ-AlOOH was investigated using powder X-ray diffraction up to 17 GPa. Measurement of the volume at 300 K gave a value of the bulk modulus of K0= 124(2) GPa, whereas its pressure derivative was K = 13.5(7). The b axis of the unit cell is more compressible than the a and c axes - in agreement with a neutron diffraction study at high pressure by Sano-Furukawa et al. (2008). Measurements presented here show that 8-AlOOH has a compressibility 200% higher than in the previously reported equation of state by Vanpeteghem et al. (2002).

Original languageEnglish
Pages (from-to)479-485
Number of pages7
JournalMineralogical Magazine
Issue number3
Publication statusPublished - 2009 Apr


  • AlOOH
  • Equation of state
  • High pressure
  • X-ray diffraction


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