Static compression of (Mg0.83,Fe0.17)O and (Mg0.75,Fe0.25)O ferropericlase up to 58 GPa at 300, 700, and 1100 K
-
Masanori Matsui
,
Eiji Ito
Abstract
Static compression data of (Mg0.83,Fe0.17)O and (Mg0.75,Fe0.25)O ferropericlases have been measured up to 58 GPa along 300, 700, and 1100 K isotherms, using synchrotron powder X-ray diffraction experiments combined with a Kawai-type, multi-anvil, high-pressure apparatus and sintered diamond anvils. High-temperature and high-pressure equations of state for these two ferropericlases, which have high-spin Fe2+ ions, were developed using measured compression data below 47 GPa, based on the Mie-Grüneisen relation and the Debye thermal model, combined with the 300 K Birch-Murnaghan equation. When the isothermal bulk modulus (K0T) and the Debye temperature (Θ0) are fixed at 160 GPa and 500 K, respectively, the optimized equation-of-state parameters for these two phases are as follows: the pressure derivative of the bulk modulus (K'0T), the Grüneisen constant (γ0), and the q parameter are 4.08 ± 0.02, 1.53 ± 0.04, and 0.7 ± 0.2, respectively, for (Mg0.83,Fe0.17)O; and 4.22 ± 0.03, 1.64 ± 0.04, and 0.7 ± 0.2, respectively, for (Mg0.75,Fe0.25)O. We found that calculated pressures with these equation-of-state parameters accurately reproduce the measured pressures of each ferropericlase below ~50 GPa for the isotherms of 300, 700, and 1100 K. Furthermore, the compression curve indicates that for each ferropericlase at each isothermal compression of 300, 700, and 1100 K, an abrupt volume reduction occurs at ~50 GPa. This volume reduction becomes more pronounced with increasing pressure, as a result of the progressive transition from high-spin to low-spin of the Fe2+ ions in each ferropericlase.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile
- Silician magnetite from the Dales Gorge Member of the Brockman Iron Formation, Hamersley Group, Western Australia
- The mechanism of thermal decomposition of dolomite: New insights from 2D-XRD and TEM analyses
- A revised diamond-graphite transition curve
- Insights into the crystal and aggregate structure of Fe3+ oxide/silica co-precipitates
- Compositional dependence of alkali diffusivity in silicate melts: Mixed alkali effect and pseudo-alkali effect
- Kinetics of evaporation of forsterite in vacuum
- X-ray absorption near edge structure (XANES) study of the speciation of uranium and thorium in Al-rich CaSiO3 perovskite
- Rehydration of dehydrated-dehydroxylated smectite in a low water vapor environment
- Effect of high pressure on the crystal structure and electronic properties of magnetite below 25 GPa
- OH group behavior and pressure-induced amorphization of antigorite examined under high pressure and temperature using synchrotron infrared spectroscopy
- Single-crystal Raman spectroscopy of natural paulmooreite Pb2As2O5 in comparison with the synthesized analog
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- Implications of ferrous and ferric iron in antigorite
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- Experimental growth of diopside + merwinite reaction rims: The effect of water on microstructure development
- Thermodynamic model for growth of reaction rims with lamellar microstructure
- The high-pressure behavior of micas: Vibrational spectra of muscovite, biotite, and phlogopite to 30 GPa
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