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Title: Thermal Equation of State of (Mg0.9Fe0.1)2SiO4 Olivine

Abstract

In situ synchrotron X-ray diffraction measurements have been carried out on San Carlos olivine (Mg{sub 0.9}Fe{sub 0.1}){sub 2}SiO{sub 4} up to 8 GPa and 1073 K. Data analysis using the high-temperature Birch-Murnaghan (HTBM) equation of state (EoS) yields the temperature derivative of the bulk modulus ({partial_derivative}K{sub T}/{partial_derivative}T){sub P} = -0.019 {+-} 0.002 GPa K-1. The thermal pressure (TH) approach gives {alpha}K{sub T} = 4.08 {+-} 0.10 x 10{sup -3} GPa K{sup -1}, from which ({partial_derivative}K{sub T}/{partial_derivative}T){sub P} = -0.019 {+-} 0.001 GPa K-1 is derived. Fitting the present data to the Mie-Gr{umlt u}neisen-Debye (MGD) formalism, the Gr{umlt u}neisen parameter at ambient conditions {gamma}{sub 0} is constrained to be 1.14 {+-} 0.02 with fixed volume dependence q = 1. Combining the present data with previous results on iron-bearing olivine and fitting to MGD EoS, we obtain {gamma}{sub 0} = 1.11 {+-} 0.01 and q = 0.54 {+-} 0.36. In this study the thermoelastic parameters obtained from various approaches are in good agreement with one another and previous results.

Authors:
;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914168
Report Number(s):
BNL-78736-2007-JA
Journal ID: ISSN 0031-9201; PEPIAM; TRN: US0801590
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Earth Planet. Interiors; Journal Volume: 157; Journal Issue: 3-4
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; DATA ANALYSIS; OLIVINE; SYNCHROTRONS; X-RAY DIFFRACTION; EQUATIONS OF STATE; NSLS; national synchrotron light source

Citation Formats

Liu,W., and Li, B. Thermal Equation of State of (Mg0.9Fe0.1)2SiO4 Olivine. United States: N. p., 2006. Web. doi:10.1016/j.pepi.2006.04.003.
Liu,W., & Li, B. Thermal Equation of State of (Mg0.9Fe0.1)2SiO4 Olivine. United States. doi:10.1016/j.pepi.2006.04.003.
Liu,W., and Li, B. Sun . "Thermal Equation of State of (Mg0.9Fe0.1)2SiO4 Olivine". United States. doi:10.1016/j.pepi.2006.04.003.
@article{osti_914168,
title = {Thermal Equation of State of (Mg0.9Fe0.1)2SiO4 Olivine},
author = {Liu,W. and Li, B.},
abstractNote = {In situ synchrotron X-ray diffraction measurements have been carried out on San Carlos olivine (Mg{sub 0.9}Fe{sub 0.1}){sub 2}SiO{sub 4} up to 8 GPa and 1073 K. Data analysis using the high-temperature Birch-Murnaghan (HTBM) equation of state (EoS) yields the temperature derivative of the bulk modulus ({partial_derivative}K{sub T}/{partial_derivative}T){sub P} = -0.019 {+-} 0.002 GPa K-1. The thermal pressure (TH) approach gives {alpha}K{sub T} = 4.08 {+-} 0.10 x 10{sup -3} GPa K{sup -1}, from which ({partial_derivative}K{sub T}/{partial_derivative}T){sub P} = -0.019 {+-} 0.001 GPa K-1 is derived. Fitting the present data to the Mie-Gr{umlt u}neisen-Debye (MGD) formalism, the Gr{umlt u}neisen parameter at ambient conditions {gamma}{sub 0} is constrained to be 1.14 {+-} 0.02 with fixed volume dependence q = 1. Combining the present data with previous results on iron-bearing olivine and fitting to MGD EoS, we obtain {gamma}{sub 0} = 1.11 {+-} 0.01 and q = 0.54 {+-} 0.36. In this study the thermoelastic parameters obtained from various approaches are in good agreement with one another and previous results.},
doi = {10.1016/j.pepi.2006.04.003},
journal = {Phys. Earth Planet. Interiors},
number = 3-4,
volume = 157,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}