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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 theExpand
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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 withExpand
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Spin transition of iron in magnesiowüstite in the Earth's lower mantle
Iron is the most abundant transition-metal element in the mantle and therefore plays an important role in the geochemistry and geodynamics of the Earth's interior. Pressure-induced electronic spinExpand
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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, mightExpand
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Elasticity of MgO and a primary pressure scale to 55 GPa.
  • C. Zha, H. Mao, R. Hemley
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences…
  • 5 December 2000
We have studied the elasticity and pressure-density equation of state of MgO in diamond cells to 55 GPa and have doubled the previous pressure limit of accurate elasticity determinations forExpand
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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 specificExpand
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Electronic spin state of iron in lower mantle perovskite.
  • J. Li, V. Struzhkin, +7 authors G. Shen
  • Chemistry, Medicine
  • Proceedings of the National Academy of Sciences…
  • 28 September 2004
The electronic spin state of iron in lower mantle perovskite is one of the fundamental parameters that governs the physics and chemistry of the most voluminous and massive shell in the Earth. WeExpand
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Ferromagnesian postperovskite silicates in the D'' layer of the Earth.
  • W. Mao, G. Shen, +6 authors H. Mao
  • Materials Science, Medicine
  • Proceedings of the National Academy of Sciences…
  • 9 November 2004
Natural olivine with 12 mol % Fe(2)SiO(4) and synthetic orthopyroxenes with 20% and 40% FeSiO(3) were studied beyond the pressure-temperature conditions of the core-mantle boundary. All samples wereExpand
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Melting and crystal structure of iron at high pressures and temperatures
High-pressure melting, phase transitions and structures of iron have been studied to 84 GPa and 3500 K with an improved laser heated diamond anvil cell technique and in situ high P-T x-rayExpand
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An interlaboratory comparison of piston-cylinder pressure calibration using the albite-breakdown reaction
The pressure of the reaction albite=jadeite and quartz was measured at 600° C by workers in six geophysical laboratories for the purpose of comparing pressure calibration procedures for theExpand
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