Przemysław Dera

University of Hawaiʻi at Mānoa

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Barbara Lavina

University of Chicago

Robert T. Downs

University of Arizona

Vitali B. Prakapenka

University of Chicago

Dongzhou Zhang

University of Hawaiʻi at Mānoa

Stanislav Sinogeikin

DAC Tools (United States)

David Schiferl

University of Nevada, Las Vegas

Wenge Yang

Center for High Pressure Science and Technology Advanced Research

Yue Meng

China University of Mining and Technology

Gregory J. Finkelstein

Princeton University

Guoyin Shen

Argonne National Laboratory

Cooperative Institutions

Carnegie Institution for Science

Geophysical Laboratory

Argonne National Laboratory

University of Chicago

University of Hawaiʻi at Mānoa

Chinese Academy of Sciences

University of Hawaii System

Planetary Science Institute

California Institute of Technology

Centre National de la Recherche Scientifique

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CSD 1917383: Experimental Crystal Structure Determination

The Cambridge Structural Database (2019)

Xin Gui Gregory J. Finkelstein Keyu Chen Tommy Yong Przemysław Dera

Crystal (programming language)

10.25505/fiz.icsd.cc22c62r

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High-Pressure Behavior of U-O-H Materials via Single-Crystal X-ray Diffraction

AGUSM (2002)

Christopher L. Cahill Armand Budzianowski Przemysław Dera

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Grain size dependent high-pressure elastic properties of ultrafine micro/nanocrystalline grossular

Scientific Reports (2021)

Jin S. Zhang Tetsuo Irifune Ming Hao Dongzhou Zhang Yi Hu

We have performed sound velocity and unit cell volume measurements of three synthetic, ultrafine micro/nanocrystalline grossular samples up to 50 GPa using Brillouin spectroscopy and synchrotron X-ray diffraction. The samples are characterized by average grain sizes of 90 nm, 93 nm and 179 nm (hereinafter referred to as samples Gr90, Gr93, and Gr179, respectively). The experimentally determined sound velocities and elastic properties of Gr179 sample are comparable with previous measurements, but slightly higher than those of Gr90 and Gr93 under ambient conditions. However, the differences diminish with increasing pressure, and the velocity crossover eventually takes place at approximately 20-30 GPa. The X-ray diffraction peaks of the ultrafine micro/nanocrystalline grossular samples significantly broaden between 15-40 GPa, especially for Gr179. The velocity or elasticity crossover observed at pressures over 30 GPa might be explained by different grain size reduction and/or inhomogeneous strain within the individual grains for the three grossular samples, which is supported by both the pressure-induced peak broadening observed in the X-ray diffraction experiments and transmission electron microscopy observations. The elastic behavior of ultrafine micro/nanocrystalline silicates, in this case, grossular, is both grain size and pressure dependent.

Grossular

Nanocrystalline material

Ambient pressure

10.1038/s41598-021-01960-6

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Structure and Behavior of the Ni End-Member Schreibersite Ni3P under Compression to 50 GPa

Minerals (2020)

Sasithorn Chornkrathok Dongzhou Zhang Przemysław Dera

To better understand the potential presence of light element alloys of Fe and Ni in the Earth’s interior, the crystal structure and compressional behavior of the Ni-P binary compound, schreibersite (Ni3P), have been investigated using synchrotron X-ray diffraction experiments. Both powder and two single-crystal samples of synthetic Ni3P (in different orientations with respect to the loading axis of the diamond anvil cell) were compressed up to approximately 50 GPa at ambient temperature. The compressional data obtained for Ni3P were fitted with a 3rd order Birch–Murnaghan equation of state. All data indicated that the c/a ratio of unit cell parameters remained approximately constant up to about 30 GPa but then increased progressively with pressure, exhibiting a second slight discontinuity at approximately 40 GPa. The changes in unit cell parameters at ~30 GPa and ~40 GPa suggested discontinuous changes in magnetic ordering. Moreover, the threshold of these subtle discontinuities is sensitive to the stress state and orientation of the crystal in the diamond anvil cell. This study is the first report on the compressional behavior of both powder and single-crystal schreibersite at high-pressure (up to 50 GPa). It offers insights into the effects of Ni3P components on the compressional behavior of the Earth’s core.

Diamond anvil cell

Powder Diffraction

Classification of discontinuities

Discontinuity (linguistics)

10.3390/min10040306

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Citations (2)

High-Pressure Crystallography

NATO science for peace and security series. B, Physics and biophysics (2010)

E.V. Boldyreva Przemysław Dera

10.1007/978-90-481-9258-8

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Citations (45)

Origin of morphotropic phase boundaries in ferroelectrics

Nature (2008)

Muhtar Ahart Maddury Somayazulu R. E. Cohen Panchapakesan Ganesh Przemysław Dera

Phase boundary

10.1038/nature06459

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Citations (827)

Anomalous compression behaviour of GdPO₄-monazite

Acta Crystallographica Section A Foundations of Crystallography (2008)

Oliver Tschauner Przemysław Dera Barbara Lavina Luke Borkowski

Many AB2O4 spinels transform to post-spinel structures without decomposition.Three structures of CaMn2O4 (Pmab), CaFe2O4 (Pnam) and CaTi2O4 (Bbmm) have been reported as post-spinel phases.Structure studies were conducted under high pressure using SR.CaMn2O4 transforms to CaTi2O4 type structure at about 30GPa.MnO6 octahedron is distorted by the Jahn-Teller effect induced from Mn 3+ (3d4) in the octahedral site.X-ray emission study at APS has been executed to discloses high-low spin transition of CaMn2O4 up to 100GPa.The spin transition gradually proceeds from 50GPa and then mixed spin states at 80GPa.Low-spin state is confirmed at 85GPa.A new phase is found by powder diffraction at 82 GPa.This structure (Pnam) is produced via martensic transformation by displacing atoms in every three layers perpendicular to the c-axis.Four independent sites of Mn atoms yield the different spin transition pressures.PbTiO3 tetragonal perovskite structure (P4mm) at ambient conditions transforms cubic (Pm3m) at about 12GPa, which induces the transition from ferroelectric to paraelectric.Electron density distribution analysis is performed by maximum entropy method (MEM) using single-crystal diffraction intensities up to 12GPa taken at PF and up to 35GPa by two-circle diffractometer with IP at APS. Pressure dependence of the static dipole moment is elucidated by charge density analysis.MEM provides the split atom model of Ti and oxygen atoms in the direction to the c-axis and in the cubic phase no more splitting was observed.The split is generated from the statistical distribution of atoms or domain structures.The split becomes gradually smaller with increasing pressure.This is an intrinsic phenomenon in PbTiO3.Polarization in PbTiO3 is partly canceled.

10.1107/s0108767308080446

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Citations (1)

High-pressure crystallography : from fundamental phenomena to technological applications

Springer eBooks (2010)

E.V. Boldyreva Przemysław Dera Security Programme

Diamond anvil cell

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Citations (53)

Compressional behavior of end-member and aluminous iron-bearing diopside at high pressure from single-crystal X-ray diffraction and first principles calculations

Physics and Chemistry of Minerals (2019)