Single-crystal elasticity of the rhodochrosite at high pressure by Brillouin scattering spectroscopy

Chaoshuai Zhao, Heping Li, Pofei Chen, Jianjun Jiang, Wen Liang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The sound velocity properties of single-crystal rhodochrosite (MnCO3) were determined up to 9.7 GPa at ambient temperature by Brillouin scattering spectroscopy. Six elastic constants were calculated by a genetic algorithm method using the Christoffel's equations at each pressure. The elastic constants increased linearly as a function of pressure and its pressure derivatives ∂Cij/∂P for C11, C33, C44, C12, C13, C14 were 5.86 (±0.36), 3.82 (±0.44), 2.06 (±0.39), 5.07 (±0.27), 5.34 (±0.44), 1.52 (±0.24), respectively. Based on the derived elastic constants of rhodochrosite, the aggregate adiabatic bulk and shear moduli (Ks and G) were calculated using the Voigt-Reuss-Hill averages and the linear fitting coefficients (∂Ks/∂P)T and (∂G/∂P)T were 5.05(±0.26) and 0.73(±0.05), respectively. The aggregate Vp of rhodochrosite increased clearly as a function of pressure and its pressure derivative ∂Vp/∂P was 7.99(±0.53) × 10−2 km/(s GPa), while the aggregate Vs increased slowly and ∂Vs/∂P was only 1.19(±0.12) × 10−2 km/(s GPa). The anisotropy factor for As of rhodochrosite increased from ∼40% at 0.8 GPa to ∼48% at 9.7 GPa, while Ap decreased from ∼19% to ∼16% at the corresponding pressure.

Original languageEnglish
Pages (from-to)396-405
Number of pages10
JournalHigh Pressure Research
Volume38
Issue number4
DOIs
StatePublished - 2 Oct 2018

Keywords

  • Brillouin scattering
  • elasticity
  • high pressure
  • rhodochrosite
  • sound velocity

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