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Article
Open AccessFe-N system at high pressure reveals a compound featuring polymeric nitrogen chains
Poly-nitrogen compounds have been considered as potential high energy density materials for a long time due to the large number of energetic N–N or N=N bonds. In most cases high nitrogen content and stability ...
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Article
Sound velocities of skiagite–iron–majorite solid solution to 56 GPa probed by nuclear inelastic scattering
High-pressure experimental data on sound velocities of garnets are used for interpretation of seismological data related to the Earth’s upper mantle and the mantle transition zone. We have carried out a Nuclea...
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Article
Open AccessPressure-induced structural change in liquid GaIn eutectic alloy
Synchrotron x-ray diffraction reveals a pressure induced crystallization at about 3.4 GPa and a polymorphic transition near 10.3 GPa when compressed a liquid GaIn eutectic alloy up to ~13 GPa at room temperatu...
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Article
The most incompressible metal osmium at static pressures above 750 gigapascals
Subtle anomalies in how the structure of metallic osmium evolves with pressure are detected using powder X-ray diffraction measurements at ultra-high static pressures; the anomaly at 440 gigapascals is attribu...
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Article
High Poisson's ratio of Earth's inner core explained by carbon alloying
Earth’s core exhibits similar elastic properties to rubber. Experiments show that a high-pressure phase of iron carbide modifies iron’s elastic properties under inner-core conditions, suggesting that carbon is...
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Article
Effect of iron oxidation state on the electrical conductivity of the Earth’s lower mantle
Iron can adopt different spin states in the lower mantle. Previous studies indicate that the dominant lower-mantle phase, magnesium silicate perovskite (which contains at least half of its iron as Fe3+), undergoe...
