Search Results - "Jephcoat, A P"

Structure of sodium above 100 GPa by single-crystal x-ray diffraction by McMahon, M.I, Gregoryanz, E, Lundegaard, L.F, Loa, I, Guillaume, C, Nelmes, R.J, Kleppe, A.K, Amboage, M, Wilhelm, H, Jephcoat, A.P

“…At pressures above a megabar (100 GPa), sodium crystallizes in a number of complex crystal structures with unusually low melting temperatures, reaching as low…”
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Nitrogen solubility in molten metal and silicate at high pressure and temperature by Roskosz, M., Bouhifd, M.A., Jephcoat, A.P., Marty, B., Mysen, B.O.

“…Nitrogen is the dominant gas in Earth atmosphere, but its behavior during the Earth’ differentiation is poorly known. To aid in identifying the main reservoirs…”
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Rare-gas solids in the Earth's deep interior by Jephcoat, Andrew P

“…Chemical inertness and surface volatility, combined with low abundance, have made the rare (noble) gases a unique trace-elemental and isotopic system for…”
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Convergence of Ni and Co metal–silicate partition coefficients in the deep magma-ocean and coupled silicon–oxygen solubility in iron melts at high pressures by Bouhifd, M.A., Jephcoat, A.P.

“…Models for a deep magma ocean have gained wide acceptance although with variations in the specific conditions at which core formation may have taken place…”
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Pressure-driven evolution of the covalent network in CaB6 by Kolmogorov, A N, Shah, S, Margine, E R, Kleppe, A K, Jephcoat, A P

“…We synthesized and solved an unexpectedly complex crystal structure of CaB(6) under high pressures (up to 44 GPa) and temperatures. The only known crystal…”
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Synthesis of a predicted layered LiB via cold compression by Kolmogorov, A. N., Hajinazar, S., Angyal, C., Kuznetsov, V. L., Jephcoat, A. P.

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Optical zone-centre phonon modes and macroscopic elasticity in hcp metals by Olijnyk, H., Jephcoat, A.P.

“…A simple relation between zone-centre optical phonon modes and elastic constants for hcp metals derived previously from lattice dynamical force constant models…”
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Electric-field-induced phase switching in the lead free piezoelectric potassium sodium bismuth titanate by Royles, A. J., Bell, A. J., Jephcoat, A. P., Kleppe, A. K., Milne, S. J., Comyn, T. P.

“…High-energy synchrotron radiation has been used to demonstrate an electric-field-induced phase transformation in the ceramic xK 1 / 2 Bi 1 / 2 TiO 3 - ( 1 − x…”
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Lattice dynamics of the lanthanides: Samarium at high pressure by Olijnyk, H, Jephcoat, A. P

“…Sm was studied by Raman spectroscopy at pressures up to 20$\un{GPa}$. The Raman-active phonon modes, both of the Sm-type phase and the dhcp phase, show a…”
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Pressure-induced amorphization of crystalline silica by Hemley, R. J, Jephcoat, A. P, Mao, H. K, Ming, L. C, Manghnani, M. H

“…A study that provides in situ synchrotron X-ray diffraction measurements of alpha-quartz and coesite in a diamond-anvil cell, and demonstrates that these…”
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Equation of state, elasticity, and shear strength of pyrite under high pressure by Merkel, S., Jephcoat, A. P., Shu, J., Mao, H.-K., Gillet, P., Hemley, R. J.

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Static compression of H2O-ice to 128 GPa (1.28 Mbar) by HEMLEY, R. J, JEPHCOAT, A. P, MAO, H. K, ZHA, C. S, FINGER, L. W, COX, D. E

“…Ice was compressed in a diamond-anvil cell to 128 GPa and the molar volume was measured as a function of pressure by synchrotron X-ray diffraction techniques…”
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Raman spectroscopic study of hydrous wadsleyite (β-Mg 2 SiO 4 ) to 50 GPa by Kleppe, A. K., Jephcoat, A. P., Olijnyk, H., Slesinger, A. E., Kohn, S. C., Wood, B. J.

“…Raman spectra of hydrous β-Mg2SiO4 (1.65 wt% H2O) have been measured in a diamond-anvil cell with helium as a pressure-transmitting medium at room temperature…”
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Raman spectroscopic study of hydrous γ-Mg2SiO4 to 56.5 GPa by Kleppe, A K, Jephcoat, A P, Smyth, J R

“…Raman spectra of a single-crystal fragment of hydrous γ-Mg2SiO4, synthesized in a multianvil press, have been measured in a diamond-anvil cell with helium as…”
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Questioning the evidence for Earth's oldest fossils by Brasier, Martin D, Green, Owen R, Jephcoat, Andrew P, Kleppe, Annette K, Van Kranendonk, Martin J, Lindsay, John F, Steele, Andrew, Grassineau, Nathalie V

“…Structures resembling remarkably preserved bacterial and cyanobacterial microfossils from ∼3,465-million-year-old Apex cherts of the Warrawoona Group in…”
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Effect of pressure on zone-center phonons in hexagonal-close-packed metals by Olijnyk, H, Jephcoat, A P

“…Olijnyk and Jephcoat analyzed several hexagonal-close-packed metals by Raman scattering methods in the diamond anvil cell for pressures up to 60 GPa. The…”
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Raman scattering under pressure and the phase transition in ε-GaSe by Kulibekov, A. M., Olijnyk, H. P., Jephcoat, A. P., Salaeva, Z. Y., Onari, S., Allakhverdiev, K. R.

“…Raman scattering in ε‐GaSe has been investigated at room temperature in a diamond anvil cell by using helium gas as a pressure transmitting medium. The first…”
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Synchrotron X-ray Diffraction Measurements of Single-Crystal Hydrogen to 26.5 Gigapascals by Mao, H. K., Jephcoat, A. P., Hemley, R. J., Finger, L. W., Zha, C. S., Hazen, R. M., Cox, D. E.

“…The crystal structure and equation of state of solid hydrogen have been determined directly to 26.5 gigapascals at room temperature by new synchrotron x-ray…”
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High-pressure phase diagram and equation of state of solid helium from single-crystal X-ray diffraction to 23.3 GPa by Mao, H. K., Hemley, R. J., Jephcoat, A. P., Finger, L. W., Wu, Y.

“…Single-crystal X-ray diffraction measurements have been performed on solid He-4 from 15.6 to 23.3 GPa at 300 K with synchrotron radiation. The diffraction…”
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The effect of pressure on partitioning of Ni and Co between silicate and iron-rich metal liquids: a diamond-anvil cell study by Bouhifd, M.Ali, Jephcoat, Andrew P.

“…High-pressure and high-temperature experiments have been conducted with a laser-heated diamond-anvil cell (LHDAC) to determine the partition coefficients for…”
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