Synchrotron x-ray powder diffraction study of natural P2/n-omphacites at high-pressure conditions

A. Pavese, V. Diella, D. Levy, M. Hanfland

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Synchrotron X-ray powder diffraction experiments at high pressure conditions (0.0001-13 GPa) were performed at ESRF (Grenoble-F), on the beamline ID9, to investigate the bulk elastic properties of natural P2/n- omphacites, with quasi-ideal composition. The monoclinic cell parameters a, b, c and β were determined as a function of pressure, and their compressibility coefficients are 0.00277(7), 0.00313(8), 0.00292(5) and 0.00116(4) GPa-1, respectively. The third-order BirchMurnaghan equation of state was used to interpolate the experimental P - V data, obtaining Ko = 116.6 (±2.5) GPa and K1o = 6.03 (±0.60). Ko was also determined by means of the axial and angular compressibilities [122.5(±1.7) GPa], and of the finite Lagrangian strain theory [121.5(±1.0) GPa]. The discrepancies on Ko are discussed in the light of a comparison between techniques to determine the bulk modulus of crystalline materials from static compression diffraction data.

Original languageEnglish
Pages (from-to)9-16
Number of pages8
JournalPhysics and Chemistry of Minerals
Issue number1
StatePublished - 2001
Externally publishedYes


  • Bulk elastic
  • Lagrangian strain theory
  • Omphacites
  • Properties


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