Grain size dependent high-pressure elastic properties of ultrafine micro/nanocrystalline grossular. Academic Article uri icon


  • We have performed sound velocity and unit cell volume measurements of three synthetic, ultrafine micro/nanocrystalline grossular samples up to 50 GPa using Brillouin spectroscopy and synchrotron X-ray diffraction. The samples are characterized by average grain sizes of 90nm, 93nm and 179nm (hereinafter referred to assamples Gr90, Gr93, and Gr179, respectively). The experimentally determined sound velocities and elastic properties of Gr179 sample are comparable with previous measurements, but slightly higher than those of Gr90 and Gr93 under ambient conditions. However, the differences diminish with increasing pressure, and the velocity crossover eventually takes place at approximately 20-30 GPa. The X-ray diffraction peaks of the ultrafine micro/nanocrystalline grossular samples significantly broaden between 15-40 GPa, especially for Gr179. The velocity or elasticity crossover observed at pressures over 30 GPa might be explained by different grain size reduction and/or inhomogeneous strain within the individual grains for the three grossular samples, which is supported by both the pressure-induced peak broadening observed in the X-ray diffraction experiments and transmission electron microscopy observations. The elastic behavior of ultrafine micro/nanocrystalline silicates, in this case, grossular, is both grain size and pressure dependent.

published proceedings

  • Sci Rep

author list (cited authors)

  • Zhang, J. S., Irifune, T., Hao, M., Zhang, D., Hu, Y., Tkachev, S., ... Prakapenka, V.

citation count

  • 0

complete list of authors

  • Zhang, Jin S||Irifune, T||Hao, M||Zhang, D||Hu, Y||Tkachev, S||Dera, P||Chen, J||Jiang, Ying-Bing||Brearley, Adrian J||Bass, JD||Prakapenka, V

publication date

  • January 2021