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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
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. Expand
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
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. Expand
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
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. Expand
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
With the liquid core as an unlimited reservoir of iron, core-mantle reactions could further enrich the iron content in this phase and explain the intriguing seismic signatures observed in the D'' layer. Expand
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
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 involvingExpand
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 newlyExpand
Sound velocity and elasticity of single‐crystal forsterite to 16 GPa
As an abundant component of Earth's upper mantle, forsterite (Mg2SiO4) has been the subject of extensive investigation for many decades. The pressure dependences of sound velocity and elasticity areExpand
Deformation of polycrystalline MgO at pressures of the lower mantle
[1] Room temperature investigations on the shear strength, elastic moduli, elastic anisotropy, and deformation mechanisms of MgO (periclase) are performed in situ up to pressures of 47 GPa usingExpand