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Calibration of the ruby pressure gauge to 800 kbar under quasi‐hydrostatic conditions
An improved calibration curve of the pressure shift of the ruby R1 emission line was obtained under quasi-hydrostatic conditions in the diamond-window, high-pressure cell to 800 kbar. Argon was the…
Quasi‐hydrostatic compression of magnesium oxide to 52 GPa: Implications for the pressure‐volume‐temperature equation of state
Room temperature static compression of MgO (periclase) was performed under nearly hydrostatic conditions using energy dispersive synchrotron X-ray diffraction in a diamond anvil cell with…
Spin transition of iron in magnesiowüstite in the Earth's lower mantle
The high-pressure, low-spin state of iron in magnesiowüstite exhibits a much higher bulk modulus and bulk sound velocity than the low- pressure, high- Spin state, which provides an additional explanation for the seismic wave heterogeneity in the lowermost mantle.
The fate of subducted basaltic crust in the Earth's lower mantle
The subduction of oceanic lithosphere into the Earth's deep interior is thought to drive convection and create chemical heterogeneity in the mantle. The oceanic lithosphere as a whole, however, might…
Elasticity of MgO and a primary pressure scale to 55 GPa.
- C. Zha, H. Mao, R. Hemley
- Materials ScienceProceedings of the National Academy of Sciences…
- 5 December 2000
The present study provides a direct determination of pressure without recourse to any prior pressure standard, thus creating a primary pressure scale and improving the commonly used ruby fluorescence pressure scale to 1% accuracy.
Coesite-bearing eclogite from the Dabie Mountains in central China
Coesite and Coesite pseudomorphs are recognized in eclogite from the Dabie Mountains, a collision zone between the Sino-Korean and Yangtze cratons in central China. This third known occurrence of…
Specific volume measurements of Cu, Mo, Pd, and Ag and calibration of the ruby R1 fluorescence pressure gauge from 0.06 to 1 Mbar
The wavelength shift with pressure of the ruby R1 fluorescence line (Δλ) has been calibrated in the diamond‐window pressure cell from 0.06 to 1 Mbar. This was done by simultaneously making specific…
Electronic spin state of iron in lower mantle perovskite.
- Jie Li, V. Struzhkin, G. Shen
- Geology, Materials ScienceProceedings of the National Academy of Sciences…
- 28 September 2004
Experimental evidence for spin-pairing transition in aluminum-bearing silicate perovskite (Mg,Fe)(Si,Al)O(3) under the lower mantle pressures is presented and it is demonstrated that as pressure increases, iron in perovkite transforms gradually from the initial high- spin state toward the final low-spin state.
Analysis of lattice strains measured under nonhydrostatic pressure
The equations for the lattice strains produced by nonhydrostatic compression are presented for all seven crystal systems in a form convenient for analyzing x-ray diffraction data obtained by newly…
Effect of pressure, temperature, and composition on lattice parameters and density of (Fe,Mg)SiO3‐perovskites to 30 GPa
High-pressure, high-temperature properties of MgSiO3, (Fe0.1Mg0.9)SiO3, and (Fe0.2Mg0.8)SiO3 perovskites have been investigated using a newly developed X ray diffraction technique involving…