Search Results - "Hemley, R. J"

Creating superconductivity in WB2 through pressure-induced metastable planar defects by Lim, J., Hire, A. C., Quan, Y., Kim, J. S., Xie, S. R., Sinha, S., Kumar, R. S., Popov, D., Park, C., Hemley, R. J., Vohra, Y. K., Hamlin, J. J., Hennig, R. G., Hirschfeld, P. J., Stewart, G. R.

“…High-pressure electrical resistivity measurements reveal that the mechanical deformation of ultra-hard WB 2 during compression induces superconductivity above…”
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Formation and structure of a dense octahedral glass by GUTHRIE, M, TULK, C. A, BENMORE, C. J, XU, J, YARGER, J. L, KLUG, D. D, TSE, J. S, MAO, H-K, HEMLEY, R. J

“…We have performed in situ x-ray and neutron-diffraction measurements, and molecular dynamics simulations, of GeO2, an archetypal network-forming glass under…”
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Phonon Density of States of Iron up to 153 Gigapascals by Mao, H. K., Xu, J., Struzhkin, V. V., Shu, J., Hemley, R. J., Sturhahn, W., Hu, M. Y., Alp, E. E., Vocadlo, L., Alfè, D., Price, G. D., Gillan, M. J., Schwoerer-Böhning, M., Häusermann, D., Eng, P., Shen, G., Giefers, H., Lübbers, R., Wortmann, G.

“…We report phonon densities of states (DOS) of iron measured by nuclear resonant inelastic x-ray scattering to 153 gigapascals and calculated from ab initio…”
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The plastic deformation of iron at pressures of the Earth's inner core by Wenk, H.-R, Matthies, S, Hemley, R. J, Mao, H.-K, Shu, J

“…Soon after the discovery of seismic anisotropy in the Earth's inner core, it was suggested that crystal alignment attained during deformation might be…”
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X-ray diffraction and equation of state of hydrogen at megabar pressures by Loubeyre, P, LeToullec, R, Hausermann, D, Hanfland, M, Hemley, R. J, Mao, H. K, Finger, L. W

“…Loubeyre et al report X-ray diffraction measurements of the structure of single-crystal molecular hydrogen at pressures up to 109 GPa for H2 and 119 GPa for…”
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Low-Compressibility Carbon Nitrides by Teter, David M., Hemley, Russell J.

“…First-principles calculations of the relative stability, structure, and physical properties of carbon nitride polymorphs predict a cubic form of C$_3$N$_4$…”
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Compression of Ice to 210 Gigapascals: Infrared Evidence for a Symmetric Hydrogen-Bonded Phase by Goncharov, A. F., Struzhkin, V. V., Somayazulu, M. S., Hemley, R. J., Mao, H. K.

“…Protonated and deuterated ices (H$_2$O and D$_2$O) compressed to a maximum pressure of 210 gigapascals at 85 to 300 kelvin exhibit a phase transition at 60…”
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Superconductivity in Boron by Eremets, Mikhail I., Struzhkin, Viktor V., Mao, Ho-kwang, Hemley, Russell J.

“…Metals formed from light elements are predicted to exhibit intriguing states of electronic order. Of these materials, those containing boron are of…”
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Characterization of nitrogen doped chemical vapor deposited single crystal diamond before and after high pressure, high temperature annealing by Charles, S. J., Butler, J. E., Feygelson, B. N., Newton, M. E., Carroll, D. L., Steeds, J. W., Darwish, H., Yan, C.-S., Mao, H. K., Hemley, R. J.

“…A 820 micron thick single crystal diamond layer epitaxially grown on a single crystal diamond seed (high pressure, high temperature grown synthetic) by…”
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The pressure-temperature phase and transformation diagram for carbon; updated through 1994 by Bundy, F.P., Bassett, W.A., Weathers, M.S., Hemley, R.J., Mao, H.U., Goncharov, A.F.

“…In recent years, important advances in our understanding of the pressure-temperature phase and transformation diagram for carbon have occurred as a result of…”
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Spectroscopic Studies of the Vibrational and Electronic Properties of Solid Hydrogen to 285 GPa by Goncharov, Alexander F., Gregoryanz, Eugene, Hemley, Russell J., Mao, Ho-kwang

“…We report Raman scattering and visible to near-infrared absorption spectra of solid hydrogen under static pressure up to 285 GPa between 20 and 140 K. We…”
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High-Pressure Compounds in Methane-Hydrogen Mixtures by Somayazulu, M. S., Finger, L. W., Hemley, R. J., Mao, H. K.

“…The effect of pressure on chemical interactions in molecular mixtures is important for problems spanning fundamental chemistry, planetary science, and…”
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Phase Diagram of Iron by in Situ X-Ray Diffraction: Implications for Earth's Core by Yoo, C. S., Akella, J., Campbell, A. J., Mao, H. K., Hemley, R. J.

“…The phase diagram of iron has been studied to 130 gigapascals (1 gigapascal = 10$^4$ atmospheres) and 3500 kelvin by a combined laser-heated diamond-anvil cell…”
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Pressure-Induced High-Spin to Low-Spin Transition in FeS Evidenced by X-Ray Emission Spectroscopy by Rueff, J.-P., Kao, C.-C., Struzhkin, V. V., Badro, J., Shu, J., Hemley, R. J., Mao, H. K.

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High-pressure X-ray diffraction of SiO2 glass by MEADE, C, HEMLEY, R. J, MAO, H. K

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Thermoelasticity of Silicate Perovskite and Magnesiowüstite and Stratification of the Earth's Mantle by Stixrude, Lars, Hemley, R. J., Fei, Y., Mao, H. K.

“…Analyses of x-ray-diffraction measurements on (Mg,Fe)SiO$_3$ perovskite and (Mg,Fe)O magnesiowüstite at simultaneous high temperature and pressure are used to…”
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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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Phase transition in solid molecular hydrogen at ultrahigh pressures by Hemley, R. J., Mao, H. K.

“…Solid normal hydrogen was compressed in a diamond-anvil cell to pressures above 200 GPa. Spontaneous Raman spectra demonstrate that the solid undergoes a…”
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Crystal structure of sulfur and selenium at pressures up to 160 GPa by Degtyareva, O., Gregoryanz, E., Mao, H. K., Hemley, R. J.

“…Using advanced in situ X-ray diffraction techniques at high pressures and temperatures, we have resolved the long-standing problem of the phase transition…”
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High-Pressure Chemistry of Hydrogen in Metals: In Situ Study of Iron Hydride by Badding, J. V., Hemley, R. J., Mao, H. K.

“…Optical observations and x-ray diffraction measurements of the reaction between iron and hydrogen at high pressure to form iron hydride are described. The…”
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