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Chinese Journal of High Pressure Physics  > 2016  >  30(1): 20-26.
QIN Fei, WANG Ying, WU Xiang, QIN Shan, LI Hui, LI Xiao-Dong, YANG Ke. Compressibility of Natural Olivine Single-Crystals[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003
Citation: QIN Fei, WANG Ying, WU Xiang, QIN Shan, LI Hui, LI Xiao-Dong, YANG Ke. Compressibility of Natural Olivine Single-Crystals[J]. Chinese Journal of High Pressure Physics, 2016, 30(1): 20-26. doi: 10.11858/gywlxb.2016.01.003
shu

Compressibility of Natural Olivine Single-Crystals

doi: 10.11858/gywlxb.2016.01.003
  • 1.

    Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earthand Space Sciences, Peking University, Beijing 100871, China

  • 2.

    Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China

  • 3.

    Synchrotron Radiation Laboratory, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 4.

    Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201024, China

  • Received Date: 01 Feb 2015
  • Rev Recd Date: 17 Apr 2015
    Abstract
  • In situ X-ray diffraction measurements for natural Fe-bearing and Fe-free Mg2SiO4 forsterite single-crystals ((Mg1.83Fe0.17)SiO4 and Mg2SiO4) were performed with diamond anvil cell high-pressure device and synchrotron radiation X-ray diffraction at room temperature.The experimental results showed that no phase transition of two natural olivine single-crystals was observed within the upper highest pressure of 9.9GPa.The isothermal relationship of pressure and volume in the two kinds of crystals is well described by the second-order Birch-Murnaghan equation of state with the zero-pressure unit cell volume and zero-pressure bulk modulus of 0.2929(3)nm3 and 140(3)GPa for Fe-bearing forsterite and 0.2899(1)nm3 and 151(2)GPa for Fe-free forsterite, respectively.The linear compressibilities along a, b and c axes (ka, kb and kc) are elastically anisotropic in the two kinds of forsterite and the anisotropy can be described as kb>kc>ka.With the addition of iron into the crystals, the bulk velocity of olivine decreases and the difference between the two kinds of forsterite single-crystals is 5.2%.This result will be significant for the study of the composition of the earth's upper mantle and its elastic wave velocities.

     

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