TY - JOUR
T1 - Brillouin scattering and X-ray diffraction of San Carlos olivine
T2 - direct pressure determination to 32 GPa
AU - Zha, Chang Sheng
AU - Duffy, Thomas S.
AU - Downs, Robert T.
AU - Mao, Ho Kwang
AU - Hemley, Russell J.
N1 - Funding Information:
We thank J.M. Brown, W.A. Bassett, and an anonymous reviewer for thorough and thoughtful reviews. This research was supported by the NSF. The Center for High-Pressure Research is an NSF Science and Technology Center. [RO]
PY - 1998/6/15
Y1 - 1998/6/15
N2 - The single-crystal elastic moduli of San Carlos olivine, (Mg0.9Fe0.1)2SiO4, were determined at seven pressures between 2.5 and 32.5 GPa by Brillouin spectroscopy in a diamond anvil cell. The unit cell volume was also determined at each pressure (and ambient pressure) by single-crystal X-ray diffraction. The shear elastic moduli exhibit non-linear pressure dependencies. In particular, a non-linear dependence is required for the elastic modulus, C55, above 10 GPa. Aggregate bulk and shear moduli were determined from Hashin-Shtrikman averages of the individual constants. Pressures were determined by fitting the bulk modulus (Reuss bound) and volume data to a third-order Eulerian finite strain equation and integrating. The results are compared to independent pressure measurements made using the ruby fluorescence scale. The ruby measurements yield pressures that are in good agreement with the Brillouin results. On average, the ruby fluorescence measurements produce pressures that are larger than the Brillouin determinations by 1.6%.
AB - The single-crystal elastic moduli of San Carlos olivine, (Mg0.9Fe0.1)2SiO4, were determined at seven pressures between 2.5 and 32.5 GPa by Brillouin spectroscopy in a diamond anvil cell. The unit cell volume was also determined at each pressure (and ambient pressure) by single-crystal X-ray diffraction. The shear elastic moduli exhibit non-linear pressure dependencies. In particular, a non-linear dependence is required for the elastic modulus, C55, above 10 GPa. Aggregate bulk and shear moduli were determined from Hashin-Shtrikman averages of the individual constants. Pressures were determined by fitting the bulk modulus (Reuss bound) and volume data to a third-order Eulerian finite strain equation and integrating. The results are compared to independent pressure measurements made using the ruby fluorescence scale. The ruby measurements yield pressures that are in good agreement with the Brillouin results. On average, the ruby fluorescence measurements produce pressures that are larger than the Brillouin determinations by 1.6%.
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U2 - 10.1016/S0012-821X(98)00063-6
DO - 10.1016/S0012-821X(98)00063-6
M3 - Article
AN - SCOPUS:0002692150
SN - 0012-821X
VL - 159
SP - 25
EP - 33
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
IS - 1-2
ER -