Dion L. Heinz

University of Chicago

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A. J. Campbell

University of Chicago

Guoyin Shen

Argonne National Laboratory

Vitali B. Prakapenka

University of Chicago

Russell J. Hemley

University of Illinois Chicago

Wendy L. Mao

SLAC National Accelerator Laboratory

Raymond Jeanloz

University of California, Berkeley

Christopher T Seagle

Sandia National Laboratories

Jinfu Shu

Center for High Pressure Science and Technology Advanced Research

Jeffrey S. Sweeney

University of Chicago

R. A. Fischer

Planetary Science Institute

Cooperative Institutions

University of Chicago

Carnegie Institution for Science

Argonne National Laboratory

Geophysical Laboratory

Planetary Science Institute

California Institute of Technology

Center for High Pressure Science and Technology Advanced Research

Centre National de la Recherche Scientifique

University of California, Berkeley

Advanced Photon Source

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Phase relations of Fe–Ni alloys at high pressure and temperature

Physics of The Earth and Planetary Interiors (2005)

Wendy L. Mao A. J. Campbell Dion L. Heinz Guoyin Shen

Diamond anvil cell

10.1016/j.pepi.2005.11.002

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Citations (54)

New phase for mantle research

Nature (1995)

Dion L. Heinz

10.1038/374216a0

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Citations (1)

Compression of theB2high-pressure phase of NaCl

Physical review. B, Condensed matter (1984)

Dion L. Heinz Raymond Jeanloz

Results from room-temperature static-compression experiments are presented for the $B2$ phase of NaCl between 25 and 70 GPa (250---700 kbar) pressure. The volume and bulk modulus of the $B2$ phase, extrapolated to zero pressure, are $\frac{{V}_{02}}{{V}_{01}}=0.929(\ifmmode\pm\else\textpm\fi{}0.071)$ and ${K}_{02}=36.2(\ifmmode\pm\else\textpm\fi{}4.2)$ GPa based on a finite-strain analysis of the new data (${V}_{01}$) is the zero-pressure volume of the $B1$ phase). Our results are in good agreement with ab initio calculations of the NaCl ($B2$) equation of state. Also, we find that the bulk modulus probably decreases across the $B1\ensuremath{-}B2$ transition, in accord with previous predictions. We illustrate the use of high-pressure compression studies on different polymorphs for empirically determining interatomic potentials of ionic crystals.

10.1103/physrevb.30.6045

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Citations (142)

Split decision on the mantle

Nature (1991)

Dion L. Heinz

10.1038/351346a0

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Citations (1)

Experimental determination of the elasticity of iron at high pressure

Journal of Geophysical Research Atmospheres (2008)

Wendy L. Mao Viktor V. Struzhkin Alfred Q. R. Baron Satoshi Tsutsui Caterina E. Tommaseo

We present a multitechnique approach to experimentally determine the elastic anisotropy of polycrystalline hcp Fe at high pressure. Directional phonon measurements from inelastic X‐ray scattering on a sample with lattice preferred orientation at 52 GPa in a diamond anvil cell were coupled with X‐ray diffraction data to determine the elastic tensor. Comparison of the results from this new method with the elasticity determined by lattice strain analysis of radial X‐ray diffraction measurements showed significant differences, highlighting the importance of strength anisotropy in hcp Fe. At 52 GPa, we found that a method which combines results from inelastic scattering and pressure‐volume measurements gives a shape in the velocity anisotropy close to sigmoidal (with a faster c and slower a axis) a smaller magnitude in the anisotropy and compared to velocities based on the lattice strain method which gives a bell shape velocity distribution with the fast direction between the c and a axes. We used additional results from nuclear resonant inelastic X‐ray scattering to constrain errors and provide additional validation of the accuracy of our results.

Elasticity

Lattice (music)

10.1029/2007jb005229

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Citations (51)

Multidisciplinary impact of the deep mantle phase transition in perovskite structure

Eos (2005)

Thorne Lay Dion L. Heinz Miaki Ishii Sang‐Heon Shim Jun Tsuchiya

A phase transition in (Mg, Fe) SiO 3 (magnesium silicate‐perovskite) for pressure‐temperature conditions near the base of Earth's mantle, first reported in May 2004, is stimulating strong multidisciplinary excitement and interactions. Experimentally and theoretically determined characteristics of this phase transition indicate that it may hold the key to understanding enigmatic seismological structures in the D” region of the lowermost mantle, with important implications for heat transport, thermal instabilities, and chemical properties of the lower mantle. All minerals undergo phase transitions with increasing depth into the Earth, reorganizing their crystal structures into denser‐packed forms stable over a finite range of pressures and temperatures. The changes in material properties across such transitions often give rise to detectable contrasts in seismic velocities and density.

Post-perovskite

Silicate perovskite

10.1029/2005eo010001

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Citations (26)

Material transport in laser-heated diamond anvil cell melting experiments

Geophysical Research Letters (1992)

A. J. Campbell Dion L. Heinz A. M. Davis

Olivine from San Carlos, Arizona, Fa0.093 was compressed in a diamond anvil cell and melted under the action of a Nd: YAG laser. Stripes of melted material were formed by scanning the sample under the laser. Scanning electron microscopy and x‐ray microanalysis of the recovered samples reveal large‐scale (∼100 μm) transport of material through the sample, caused by the laser‐induced melting. Early‐crystallizing phases form at the beginning of the laser‐melted stripe; incompatible elements and late‐crystallizing phases are concentrated at the end of the stripe. This behavior is exploited to determine melting behavior of high‐pressure silicate assemblages of olivine composition. At pressures where β‐spinel is the phase melted, relative strengths of partitioning can be estimated for the incompatible elements studied. Iron was found to partition into the melt from β‐spinel less strongly than calcium, and slightly more strongly than manganese. At higher pressures, where a silicate perovskite/magnesiowüstite assemblage is melted, it is determined that silicate perovskite is the liquidus phase, with iron‐rich magnesiowüstite accumulating at the end of the laser‐melted stripe.

Liquidus

Diamond anvil cell

Stishovite

Wüstite

10.1029/92gl00972

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Citations (10)

Thermal analysis in the laser-heated diamond anvil cell

Pure and Applied Geophysics (1993)

Jeffrey S. Sweeney Dion L. Heinz

Diamond anvil cell

Classification of discontinuities

Thermal Radiation

10.1007/bf00998342

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Citations (7)

Thermal pressure in the laser‐heated diamond anvil cell

Geophysical Research Letters (1990)

Dion L. Heinz

Estimation of the thermal elastic effect is necessary for the calibration of the pressure and temperature conditions during laser‐heated diamond anvil cell experiments, since above 800K, the standard technique of using ruby florescence to measure pressure fails. Continuum calculations based upon the thermoelastic equations for an elastic medium were used to estimate the thermal pressure resulting from a radially symmetric temperature gradient in an elastic sphere with zero displacement on its surface. This calculation corresponds to the thermal pressure generated in a laser‐heated diamond anvil cell sample that is compressed without a pressure medium. This solution must fall between circumstances where the sample is held at constant pressure and where the sample is held at constant volume. It is shown here that the thermal pressure in an elastic medium with a Gaussian temperature gradient is approximately 40–60% of the thermodynamic value of the thermal pressure in a material raised to some constant temperature with the volume constrained to be constant. Even though the thermal pressure correction can be significant in terms of the total pressure that the sample experiences, these calculations indicate that the correction can be estimated to approximately 10%.

Diamond anvil cell

Thermoelastic damping

Constant (computer programming)

10.1029/gl017i008p01161

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Citations (69)

Equations of state and optical properties of the high pressure phase of zinc sulfide

Journal of Physics and Chemistry of Solids (1991)

Yanhua Zhou A. J. Campbell Dion L. Heinz

Zinc sulfide

Diamond anvil cell

10.1016/0022-3697(91)90080-j

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Citations (60)