Chang‐Sheng Zha

Carnegie Institution for Science

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Russell J. Hemley

University of Illinois Chicago

T. S. Duffy

Princeton University

Robert T. Downs

University of Arizona

Ho‐kwang Mao

Center for High Pressure Science and Technology Advanced Research

L. W. Finger

Geophysical Laboratory

William A. Bassett

Cornell University

Ho-kwang Mao

Geophysical Laboratory

Zhongwu Wang

Cornell University

A. P. Jephcoat

Okayama University

R. Boehler

Oak Ridge National Laboratory

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Carnegie Institution for Science

Geophysical Laboratory

Center for High Pressure Science and Technology Advanced Research

Argonne National Laboratory

University of Chicago

Chinese Academy of Sciences

Centre National de la Recherche Scientifique

Cornell University

Lawrence Livermore National Laboratory

Los Alamos National Laboratory

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Correction: Corrigendum: Carbon precipitation from heavy hydrocarbon fluid in deep planetary interiors

Nature Communications (2013)

Sergey S. Lobanov Peinan Chen Xiao‐Jia Chen Chang‐Sheng Zha Konstantin D. Litasov

Carbon fibers

10.1038/ncomms3868

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Citations (6)

Optical study of H2O ice to 120GPa: Dielectric function, molecular polarizability, and equation of state

The Journal of Chemical Physics (2007)

Chang‐Sheng Zha Russell J. Hemley Stephen A. Gramsch Ho‐kwang Mao William A. Bassett

The refractive index of H2O ice has been measured to 120GPa at room temperature using reflectivity methods. The refractive index increases significantly with pressure on initial compression and exhibits small changes with pressure at previously identified phase transitions. Pressure dependencies of the molecular polarizability show changing slopes in different pressure regions. A general molar refractivity analysis of this change in slope reveals features at 60GPa due to the onset of the ice VII-X transition. Band gap closure in H2O ice is constrained by the dispersion data using a single oscillator dielectric model. Sample thickness measurements obtained from interference patterns yield pressure-volume relations in excellent agreement with those measured by x-ray diffraction.

10.1063/1.2463773

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Citations (78)

Raman measurements of phase transitions in dense solid hydrogen and deuterium to 325 GPa

Proceedings of the National Academy of Sciences (2014)

Chang‐Sheng Zha R. E. Cohen Ho-kwang Mao Russell J. Hemley

Significance Understanding the behavior of hydrogen under pressure has been a major challenge in modern physics since the early days of quantum mechanics. This paper reports new spectroscopic measurements showing that hydrogen and deuterium transform to complex molecular-based structures to pressures of at least 325 GPa (3.25 megabars). These phases are based on distorted graphene sheets of hydrogen molecules, a major surprise in our understanding of this fundamental system at very high densities. The results provide constraints for theoretical calculations of structures, phase transitions, and electronic properties, including the transition to the predicted metallic state of the solid at 300 K.

Classification of discontinuities

Solid hydrogen

10.1073/pnas.1402737111

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Citations (40)

Sound Velocities in Dense Hydrogen and the Interior of Jupiter

Science (1994)

T. S. Duffy Willem L. Vos Chang‐Sheng Zha Russell J. Hemley Ho-kwang Mao

Sound velocities in fluid and crystalline hydrogen were measured under pressure to 24 gigapascals by Brillouin spectroscopy in the diamond anvil cell. The results provide constraints on the intermolecular interactions of dense hydrogen and are used to construct an intermolecular potential consistent with all available data. Fluid perturbation theory calculations with the potential indicate that sound velocities in hydrogen at conditions of the molecular layer of the Jovian planets are lower than previously believed. Jovian models consistent with the present results remain discrepant with recent free oscillation spectra of the planet by 15 percent. The effect of changing interior temperatures, the metallic phase transition depth, and the fraction of high atomic number material on Jovian oscillation frequencies is also investigated with the Brillouin equation of state. The present data place strong constraints on sound velocities in the Jovian molecular layer and provide an improved basis for interpreting possible Jovian oscillations.

Atmosphere of Jupiter

Gas giant

Jupiter (rocket family)

10.1126/science.263.5153.1590

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Citations (64)

Equation of state of forsterite to 17.2 GPa and the effects of pressure media

American Mineralogist (1996)

Robert T. Downs Chang‐Sheng Zha T. S. Duffy L. W. Finger

Forsterite

Source

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Recent Progress in High-Pressure Brillouin Scattering: Olivine and Ice.

The Review of High Pressure Science and Technology (1998)

Chang‐Sheng Zha Ho‐kwang Mao Russell J. Hemley T. S. Duffy

We report measurements of the sound velocity and elasticity for single-crystal San Carlos olivine to 32 GPa and polycrystalline ice VII to 40 GPa. For San Carlos olivine single crystals, We performed both Brillouiln scattering and X-ray diffraction measurements at each pressure to obtain independently the equation of state and elasticity. The absolute pressure P can be calculated from thermodynamic relations and compared with the ruby pressure scale. In an experiment on polycrystalline ice VII, we demonstrate that Brillouin scattering can be used for elastic constant measurements on polycrystalline materials as well as on single crystals.

Elasticity

Brillouin zone

10.4131/jshpreview.7.739

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Citations (14)

A quenchable superhard carbon phase synthesized by cold compression of carbon nanotubes

Proceedings of the National Academy of Sciences (2004)

Zhongwu Wang Yusheng Zhao K. T. Tait Xiaozhou Liao David Schiferl

A quenchable superhard high-pressure carbon phase was synthesized by cold compression of carbon nanotubes. Carbon nanotubes were placed in a diamond anvil cell, and x-ray diffraction measurements were conducted to pressures of ≈100 GPa. A hexagonal carbon phase was formed at ≈75 GPa and preserved at room conditions. X-ray and transmission electron microscopy electron diffraction, as well as Raman spectroscopy at ambient conditions, explicitly indicate that this phase is a sp 3 -rich hexagonal carbon polymorph, rather than hexagonal diamond. The cell parameters were refined to a 0 = 2.496(4) Å, c 0 = 4.123(8) Å, and V 0 = 22.24(7) Å 3 . There is a significant ratio of defects in this nonhomogeneous sample that contains regions with different stacking faults. In addition to the possibly existing amorphous carbon, an average density was estimated to be 3.6 ± 0.2 g/cm 3 , which is at least compatible to that of diamond (3.52 g/cm 3 ). The bulk modulus was determined to be 447 GPa at fixed K′≡4, slightly greater than the reported value for diamond of ≈440–442 GPa. An indented mark, along with radial cracks on the diamond anvils, demonstrates that this hexagonal carbon is a superhard material, at least comparable in hardness to cubic diamond.

Carbon fibers

Amorphous carbon

10.1073/pnas.0405877101

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Citations (166)

In situ determination of the compressibility of synthetic pure zircon (ZrSiO₄) and the onset of the zircon-reidite phase transition

American Mineralogist (2004)

W. van Westrenen M. R. Frank John M. Hanchar Yingwei Fei Robert J. Finch

We have determined the room-temperature compressibility of pure, synthetic zircon (ZrSiO4). Unit-cell volumes of a powdered sample were determined in situ as a function of pressure up to 27 GPa in a diamond anvil cell (DAC), by using angle-dispersive synchrotron X-ray diffraction (XRD) techniques. Unit-cell volumes were fitted to a Birch-Murnaghan equation of state, resulting in a roomtemperature bulk modulus for the zircon structure, KT0 = 199 ± 1 GPa, and ambient pressure unit-cell volume V0 = 260.89 ± 0.03 Å3, when (∂KT0/∂P)T = K'T0 is fixed at 4. This bulk modulus is over 12% lower than that suggested by earlier measurements using impure, natural zircon sample. In addition, we observed the start of the transformation of zircon to reidite (scheelite-structured ZrSiO4) at a pressure of 19.7 GPa, over 3 GPa lower than previously determined for natural (impure) zircon. Together with compressibility measurements of a trace-element-doped zircon, these observations suggest that impurities affect the phase transition kinetics and compressibility of zircon, and by analogy, perhaps of other silicate minerals.

Scheelite

Diamond anvil cell

10.2138/am-2004-0123

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Citations (88)

Structural Behavior of Sr2Bi2O5 at High Pressures.

ChemInform (2006)

Fuxiang Zhang Bouchaib Manoun Surendra K. Saxena Chang‐Sheng Zha

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

10.1002/chin.200617010

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Pressure-induced structural changes in Bi2SrO4 compound

Materials Research Bulletin (2006)

Fuxiang Zhang Bouchaib Manoun Surendra K. Saxena Chang‐Sheng Zha

Monoclinic crystal system

Orthorhombic crystal system

Ambient pressure

10.1016/j.materresbull.2006.04.027

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