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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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Spin state of ferric iron in MgSiO3 perovskite and its effect on elastic properties
Abstract Recent studies have indicated that a significant amount of iron in MgSiO 3 perovskite (Pv) is Fe 3+ (Fe 3+ /ΣFe = 10–60%) due to crystal chemistry effects at high pressure ( P ) and that FeExpand
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Rietveld structure refinement of perovskite and post-perovskite phases of NaMgF3 (Neighborite) at high pressures
Abstract Neighborite (NaMgF3) with the perovskite structure, transforms to a post-perovskite (ppv) phase between 27 and 30 GPa. The ppv phase is observed to the highest pressures achieved (56 GPa) atExpand
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Sb2O4 at high pressures and high temperatures
Investigations on Sb{sub 2}O{sub 4} at high pressure and temperature have been performed up to 600{sup o}C and up to 27.3GPa. The so-called 'high temperature' phase ({beta}-Sb{sub 2}O{sub 4}) wasExpand
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OCTAHEDRAL TILTING EVOLUTION AND PHASE TRANSITION IN ORTHORHOMBIC NAMGF3 PEROVSKITE UNDER PRESSURE
[1] Rietveld refinement of monochromatic synchrotron x-ray powder diffraction data was used to study the evolution of octahedral tilting in the orthorhombic NaMgF3 perovskite under pressure.Expand
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Dissociation of CH4 at high pressures and temperatures: diamond formation in giant planet interiors?
Experiments using laser-heated diamond anvil cells show that methane (CH4) breaks down to form diamond at pressures between 10 and 50 gigapascals and temperatures of about 2000 to 3000 kelvin.Expand
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Pressure-induced isostructural phase transition and correlation of FeAs coordination with the superconducting properties of 111-type Na(1-x)FeAs.
The effect of pressure on the crystalline structure and superconducting transition temperature (T(c)) of the 111-type Na(1-x)FeAs system using in situ high-pressure synchrotron X-ray powderExpand
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Anomalous high-pressure behavior of amorphous selenium from synchrotron x-ray diffraction and microtomography
  • H. Liu, L. Wang, +4 authors R. Hemley
  • Materials Science, Medicine
  • Proceedings of the National Academy of Sciences
  • 9 September 2008
The high-pressure behavior of amorphous selenium has been investigated with time-resolved diamond anvil cell synchrotron x-ray diffraction and computed microtomography techniques. A two-step dynamicExpand
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Phase transitions and compressibility of NaMgF3 (Neighborite) in perovskite‐ and post‐perovskite‐related structures
[1] Monochromatic x-ray diffraction data collected in-situ within the diamond anvil cell show perovskite structured Neighborite (NaMgF3) transforms to the CaIrO3-type post-perovskite structureExpand
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Phase transition and compression behavior of gibbsite under high-pressure
In situ high-pressure synchrotron X-ray diffraction and infrared absorption experiments for gibbsite were performed at room temperature up to 53 and 25 GPa, respectively. A phase transition wasExpand
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