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Title: What Determines the fcc-bcc Structural Transformation in Shock Compressed Noble Metals?

Abstract

High pressure structural transformations are typically characterized by the thermodynamic state (pressure – volume – temperature) of the material. We present in situ x-ray diffraction measurements on laser-shock compressed silver and platinum to determine the role of deformation-induced lattice defects on high pressure phase transformations in noble metals. Results for shocked Ag show a copious increase in stacking faults (SFs) before transformation to the body-centered-cubic (bcc) structure at 144-158 GPa. In contrast, shock compressed Pt remains largely free of SFs and retains the fcc structure to over 380 GPa. These findings, along with recent results for shock compressed gold, show that SF formation promotes high pressure structural transformations in shocked noble metals that are not observed under static compression. Potential SF-related mechanisms for fcc-bcc transformations are discussed.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
  1. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
  2. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics and Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Washington State University, Pullman, WA (United States). Institute for Shock Physics; Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
OSTI Identifier:
1632352
Alternate Identifier(s):
OSTI ID: 1678728
Grant/Contract Number:  
NA0002007; NA0002442; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 124; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Shock waves; Stacking faults; Structural phase transition; Noble metals; X-ray diffraction

Citation Formats

Sharma, Surinder M., Turneaure, Stefan J., Winey, J. M., and Gupta, Y. M. What Determines the fcc-bcc Structural Transformation in Shock Compressed Noble Metals?. United States: N. p., 2020. Web. doi:10.1103/PhysRevLett.124.235701.
Sharma, Surinder M., Turneaure, Stefan J., Winey, J. M., & Gupta, Y. M. What Determines the fcc-bcc Structural Transformation in Shock Compressed Noble Metals?. United States. doi:https://doi.org/10.1103/PhysRevLett.124.235701
Sharma, Surinder M., Turneaure, Stefan J., Winey, J. M., and Gupta, Y. M. Mon . "What Determines the fcc-bcc Structural Transformation in Shock Compressed Noble Metals?". United States. doi:https://doi.org/10.1103/PhysRevLett.124.235701.
@article{osti_1632352,
title = {What Determines the fcc-bcc Structural Transformation in Shock Compressed Noble Metals?},
author = {Sharma, Surinder M. and Turneaure, Stefan J. and Winey, J. M. and Gupta, Y. M.},
abstractNote = {High pressure structural transformations are typically characterized by the thermodynamic state (pressure – volume – temperature) of the material. We present in situ x-ray diffraction measurements on laser-shock compressed silver and platinum to determine the role of deformation-induced lattice defects on high pressure phase transformations in noble metals. Results for shocked Ag show a copious increase in stacking faults (SFs) before transformation to the body-centered-cubic (bcc) structure at 144-158 GPa. In contrast, shock compressed Pt remains largely free of SFs and retains the fcc structure to over 380 GPa. These findings, along with recent results for shock compressed gold, show that SF formation promotes high pressure structural transformations in shocked noble metals that are not observed under static compression. Potential SF-related mechanisms for fcc-bcc transformations are discussed.},
doi = {10.1103/PhysRevLett.124.235701},
journal = {Physical Review Letters},
number = 23,
volume = 124,
place = {United States},
year = {2020},
month = {6}
}

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