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Physics and Chemistry of Minerals

, Volume 28, Issue 1, pp 9–16 | Cite as

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

  • A. Pavese
  • V. Diella
  • D. Levy
  • M. Hanfland
ORIGINAL PAPER

Abstract

 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 Birch-Murnaghan equation of state was used to interpolate the experimental PV data, obtaining K0=116.6(±2.5) GPa and K0=6.03(±0.60). K0 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 K0 are discussed in the light of a comparison between techniques to determine the bulk modulus of crystalline materials from static compression diffraction data.

Key words Omphacites Bulk elastic properties Lagrangian strain theory 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • A. Pavese
    • 1
  • V. Diella
    • 2
  • D. Levy
    • 3
  • M. Hanfland
    • 3
  1. 1.Dipartimento di Scienze della Terra, Università di Milano, I-20133 Milano, Italy e-mail: pavese@p8000.terra.unimi.it Tel.: +39-2-23698321; Fax: +39-2-70638681IT
  2. 2.National Research Council, Centro di studio per la geodinamica alpina e quaternaria, I-20133 Milano, ItalyIT
  3. 3.ESRF, F-38043 Grenoble Cedex, FranceFR

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