Equation of state of a high-pressure phase of Gd3Ga5O12

Z. Mao, S. M. Dorfman, S. R. Shieh, J. F. Lin, V. B. Prakapenka, Y. Meng, and T. S. Duffy
Phys. Rev. B 83, 054114 – Published 24 February 2011

Abstract

Gd3Ga5O12 (GGG), which crystallizes in the garnet structure at ambient conditions, was observed to transform to a high-pressure phase at 88 GPa after laser heating at 1500 K. This new phase is stable at least up to 180 GPa, and can be preserved on decompression to 50 GPa. This phase is cubic and consistent with a perovskite structure of stoichiometry (Gd0.75Ga0.25)GaO3. The zero-pressure bulk modulus, K0, obtained from fitting to a Birch-Murnaghan equation of state is 373(5) GPa with a fixed pressure derivative K0'=4. At 170 GPa, the bulk modulus of perovskite-type GGG is 979(15) GPa, which is comparable to that of diamond at the same pressure [956(21) GPa] and consistent with recently reported shock-compression data for Gd3Ga5O12. The new high-pressure phase of Gd3Ga5O12 is thus highly incompressible.

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  • Received 3 November 2010

DOI:https://doi.org/10.1103/PhysRevB.83.054114

©2011 American Physical Society

Authors & Affiliations

Z. Mao1,2, S. M. Dorfman1, S. R. Shieh3, J. F. Lin2, V. B. Prakapenka4, Y. Meng5, and T. S. Duffy1

  • 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
  • 2Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas 78712, USA
  • 3Department of Earth Sciences, Physics, and Astronomy, University of Western Ontario, London, Ontario N6A 5B7, Canada
  • 4Consortium for Advanced Radiation Sources (CARS), University of Chicago, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5HPCAT, Carnegie Institution of Washington, Argonne, Illinois 60439, USA

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Vol. 83, Iss. 5 — 1 February 2011

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