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Equation of state of a high-pressure phase of Gd3Ga5O12

Journal Article · · Phys. Rev. B
 [1];  [2];  [3];  [4];  [5];  [6];  [2]
  1. Princeton Univ., NJ (United States); Univ. of Texas, Austin, TX (United States)
  2. Princeton Univ., NJ (United States)
  3. Univ. of Western Ontario, London, ON (Canada)
  4. Univ. of Texas, Austin, TX (United States)
  5. Univ. of Chicago and Argonne National Lab., Argonne, IL (United States)
  6. Carnegie Inst. of Washington, Argonne, IL (United States)
+ Show Author Affiliations

Gd3 Ga5 O12 (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 K' 0 =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 Gd3 Ga5 O12. The new high-pressure phase of Gd3 Ga5 O12 is thus highly incompressible.

Research Organization:
Energy Frontier Research Centers (EFRC); Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
SC0001057
OSTI ID:
1065288
Journal Information:
Phys. Rev. B, Journal Name: Phys. Rev. B Vol. 83
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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