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NARROW
GeoRef Subject
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elements, isotopes
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metals
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iron
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ferric iron (1)
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ferrous iron (1)
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minerals
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carbonates (1)
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oxides
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ferropericlase (1)
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heterogenite (1)
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periclase (1)
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wustite (1)
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silicates
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orthosilicates
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nesosilicates
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garnet group
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majorite (2)
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Primary terms
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crystal chemistry (1)
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crystal structure (2)
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mantle (3)
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metals
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iron
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ferric iron (1)
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ferrous iron (1)
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phase equilibria (1)
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Synthesis of calcium orthocarbonate, Ca 2 CO 4 - Pnma at P-T conditions of Earth’s transition zone and lower mantle
Effect of composition on compressibility of skiagite-Fe-majorite garnet
High-pressure synthesis of skiagite-majorite garnet and investigation of its crystal structure
Properties of H 2 O at elevated pressure and temperature are of fundamental importance in both condensed matter physics and planetary sciences. We studied behavior of H 2 O in externally heated diamond anvil cells (DACs) at pressures up to 50 GPa and temperatures to 1150 K by combining visual observations, Raman spectroscopy, and X-ray powder diffraction. The melting curve of H 2 O was found to be well described by the Simon equation P (GPa) = 2.2 + 1.31{[ T (K)/364] 3.3 – 1}. Above 30 GPa and 950 K, using visual observations and Raman spectroscopy, we found an X-ray amorphous phase clearly distinct from liquid H 2 O. The new material reversibly transforms to ice VII and can be obtained on cooling or compression of liquid H 2 O, which suggests that the high-pressure, high-temperature amorphous phase may be thermodynamically stable.